criyle/codenet-compile-errors huggingface dataset:
Language: C

#include <bits/stdc++.h>

using namespace std;

#define fastio cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(0)
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vector<int>> matrix;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define all(c) c.begin(),c.end()
#define mp make_pair
#define pb push_back
#define f first
#define int ll
#define tcase int t; cin>> t; for( ; t; --t)
#define s second
#define endl '\n'
const int MAX = 1e6+1;
const int INF = 0x3f3f3f3f;
const double PI = acos(-1);
double n;

int32_t main(){
	fastio;
	cin>> n;
	cout<< 2*PI*n<< endl;
	return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
using namespace std;
typedef long long ll;
typedef pair<int,int> P;


int main(void){
  double r; cin >> r;
  cout << 2*r*3.1415926535 << endl;
  return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

import math

R = int(input())
print(2 *R * math.pi)

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'R'
    3 | R = int(input())
      | ^
Language: C

#include <iostream>//cout<<right で右揃え
#include <iomanip>//cout<<setw(数字) で空白による桁揃え
#include <string>
#include <vector>
#include <queue>
#include <algorithm>
#include <cstdlib>//abs()で整数絶対値
#include <cmath>//abs()かfabs()で少数絶対値
#include <functional>//sort第三引数greater<型名>()で降順

using namespace std;
using ll = long long int;

int main(){
    int R;cin>>R;
    cout << R*3.1415 << endl;
    return 0;
}

Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>//cout<<right で右揃え
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>

#define rep(i, n) for(int i = 0; i < (n); ++i)

using namespace std;

using ll = long long;
using P = pair<int , int>;
  
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  int r; cin >> r;
  cout << r * 2 * 3.141592653589793 << endl;
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#define int long long
#define mkp make_pair
#define pb push_back
#define ff first
#define ss second
#define debug1(a) cout<<a<<endl;
#define debug2(a,b) cout<<a<<' '<<b<<endl;
#define debug3(a,b,c) cout<<a<' '<<b<<' '<<c<<endl;
#define rep(i,n) for(int i=0;i<n;i++)
#define repre(i,a,b)for(int i=a;i<=b;i++)
#define clr1(arr) memset(arr,-1,sizeof(arr));
#define clr0(arr) memset(arr,0,sizeof(arr));
#define pi pair<int,int>
#define pii pair<int,pi>
#define aint(v) v.begin(),v.end()
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
using namespace __gnu_pbds;
using namespace std;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> orderedSet;
typedef tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update> orderedMSet;
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
#define ump gp_hash_table<int,int,custom_hash>
//*p.find_by_order(index) return value at index
//p.order_of_key(key) return index
/*int **dp,in main function,int row,col;dp=new int*[n];rep(i,n)dp[i]=new int[m]*/
//**** Maths Section*******/
int power(int x,int y);
bool isPrime(int n);
int modInv(int a,int b);
int gcdExtended(int a,int b,int *x,int* y);
int mpower(int a,int b,int p);
/***************************/
int32_t main()
{
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
  fastio
  double p1i = 3.14159265358979323846;
  double ans=2*p1i;
  double r;
  cin>>r;
  ans=ans*r;
  cout<<ans<<endl;
  return 0;
}

int modInv(int a, int m)
{
int x, y;
int g = gcdExtended(a, m, &x, &y);
int res = (x%m + m) % m;
return res;
}

int gcdExtended(int a, int b, int *x, int *y)
{
if (a == 0){
    *x = 0, *y = 1;
    return b;
  }
  int x1, y1;
  int gcd = gcdExtended(b%a, a, &x1, &y1);
  *x = y1 - (b/a) * x1;
  *y = x1;
  return gcd;
}

int mpower(int x, int y, int p)
{
int res = 1;
x = x % p;
while(y > 0){
    if(y & 1) res = (res*x) % p;
      y = y>>1;
      x = (x*x) % p;
    }
    return res;
}
int power(int x, int y)
{
int res = 1;
while (y > 0){
    if (y & 1) res = res*x;
      y = y>>1;
      x = x*x;
    }
    return res;
}

bool isPrime(int n)
{
if (n <= 1)  return false;
  if (n <= 3)  return true;
    if (n%2 == 0 || n%3 == 0) return false;
      int p=sqrt(n);
      for(int i=5;i<=p;i=i+6)
        if (n%i == 0 || n%(i+2) == 0)
          return false;
      return true;
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
#define int ll

template<typename T1,typename T2> inline void chmin(T1 &a, T2 b){ if(a > b) a = b; }
template<typename T1,typename T2> inline void chmax(T1 &a, T2 b){ if(a < b) a = b; }

#define REP(i,n) for(int i=0;i<n;++i)
#define SORT(name) sort(name.begin(), name.end())
#define ZERO(p) memset(p, 0, sizeof(p))
#define MINUS(p) memset(p, -1, sizeof(p))
#if 1
#  define DBG(fmt, ...) printf(fmt, ##__VA_ARGS__)
#else
#  define DBG(fmt, ...)
#endif

const ll LLINF = (1LL<<60);
const int INF = (1LL<<30);
const double DINF = std::numeric_limits<double>::infinity();
const int MOD = 1000000007;
const int MAX_N = 100010;

signed main() {
    cin.tie(0); cout.tie(0);
    ios::sync_with_stdio(false);

    double R;
    cin >> R;
    cout << R * 2.0 * 3.1415926535 << endl;

    return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

import math

r = int(input())
print(2*r*math.pi)

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'r'
    3 | r = int(input())
      | ^
Language: C

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0; i<n; i++)
#define eb(t) emplace_back(t)
typedef long long ll;
typedef long long unsigned int llu;
ll MOD = 1000000007;
ll INF = 1000000009;

ll a[1000010];

void solve(){

    long double r;
    long double PI=3.14159265358979323846;
    cin >> r;
    cout << 2*r*PI << endl;

}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  solve();
  return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

import math
def main():
    r = float(input())

    print(2.0*math.pi*r)


if __name__ == '__main__':
    main()


Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'def'
    2 | def main():
      | ^~~
main.c:2:1: error: unknown type name 'def'
main.c:8:16: warning: multi-character literal with 8 characters exceeds 'int' size of 4 bytes
    8 | if __name__ == '__main__':
      |                ^~~~~~~~~~
Language: C

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
#define F first
#define S second

int32_t main(){
	ld n;
	cin >> n;
	ld p = 3.14159265359; 
	cout << p * n * 2.0;
}



Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define pii pair<int,int>
#define mp make_pair
using namespace std;


main()
{
	ios_base::sync_with_stdio(false);
	cout.tie(nullptr);
	long double r;
	cin>>r;
	cout<<fixed<<setprecision(5)<<r*2*3.141592653;
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  int n;
  cin >> n;
  double ans = 2 * n * M_PI();
  printf("%.2f\n", ans);
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:28: error: expression cannot be used as a function
    7 |   double ans = 2 * n * M_PI();
      |                            ^
Language: C++

#include <cstdio>
#include <algorithm>
#include <cmath>
#include <vector>
#define debug(...) fprintf(stderr, __VA_ARGS__)
using namespace std;
 
void read (int&a) {
	a = 0; char k = getchar(); int f = 1;
	for(;!isdigit(k); k = getchar()) if (k == '-') f = -1;
	for(; isdigit(k); k = getchar()) a = a * 10 + k - '0';
	a *= f;
}

int main ()
{
	double k, pi = acos(-1);
	scanf ("%lf", &k);
	printf ("%.10lf\n", 2 * pi * k);
	return 0;
}

Compiler output:
a.cc: In function 'void read(int&)':
a.cc:10:15: error: 'isdigit' was not declared in this scope
   10 |         for(;!isdigit(k); k = getchar()) if (k == '-') f = -1;
      |               ^~~~~~~
a.cc:11:15: error: 'isdigit' was not declared in this scope
   11 |         for(; isdigit(k); k = getchar()) a = a * 10 + k - '0';
      |               ^~~~~~~
Language: C

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/detail/standard_policies.hpp>
#include <ext/rope>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define endl "\n"
// #define long long long 

#define TRACE
#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
    template <typename Arg1>
    void __f(const char* name, Arg1&& arg1){
        cout << name << " : " << arg1 << endl;
        //use cerr if u want to display at the bottom
    }
    template <typename Arg1, typename... Args>
    void __f(const char* names, Arg1&& arg1, Args&&... args){
        const char* comma = strchr(names + 1, ','); cout.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
    }
#else
#define trace(...)
#endif

typedef trie<string,null_type,trie_string_access_traits<>,pat_trie_tag,trie_prefix_search_node_update> pref_trie;
typedef tree<long int,null_type,less<long int>,rb_tree_tag,tree_order_statistics_node_update>ordered_set;
typedef cc_hash_table<long int,long int, hash<long int>, equal_to<long int>, direct_mask_range_hashing<long int>, 
hash_standard_resize_policy<hash_exponential_size_policy<>, hash_load_check_resize_trigger<true>, true>> ht;


int main(){
   IOS;
 /*    #ifndef ONLINE_JUDGE
         freopen("in.txt",  "r",  stdin);
         freopen("out.txt", "w", stdout);
     #endif */
   
   long double val = 2 * 3.141592653589793238;
   long int r;
   cin>>r;

   val *= r;

   cout<<fixed<<setprecision(15)<<val;
   return 0;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;

int main(void)
{
  int r;
  cin>>r;
  r*=2;
  cout<<(float)(3.14)*(float)(r)<<"\n";
  return 0;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

N = int(input())
print(2*N*3.14)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | N = int(input())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'N' [-Wimplicit-int]
main.c:1:5: error: expected expression before 'int'
    1 | N = int(input())
      |     ^~~
Language: C


//

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
// const int INF = 2147483647;
// const ll INF = 9223372036854775807;
// const ll MOD = 1e9 + 7;

int main(){
	double R;
	cin >> R;

	double ans = M_PI * R * 2.0;

	cout << fixed << setprecision(10);
	cout << ans << endl;

	return 0;
}

Compiler output:
main.c:4:10: fatal error: bits/stdc++.h: No such file or directory
    4 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
#include <cmath>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <deque>
using namespace std;

#define next '\n'
#define sp " "
#define print(x) cout << (x)
#define println(x) cout << (x) << next
#define stop return(0)
#define rep(i, n) for(int (i) = (0); (i) < (n); (++i))
#define FOR(i, start, end) for(int (i) = (start); (i) < (end); (++i))
#define foreach(e, elem) for(auto& (e) : (elem))
#define FAST ios::sync_with_stdio(false); cin.tie(nullptr)
#define size(s) (s).size()
#define all(vec) (vec).begin(), (vec).end()
#define pb(e) push_back(e);
#define INF 1e+12
#define PI acos(-1)
using ll = long long;
using ull = unsigned long long;

vector<int> v;
vector<int> c;

int main(){
    double r;
    cin >> r;

    double ans = PI * 2 * r;
    printf("%.12lf", ans);
}

Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>

typedef long long LL;
typedef unsigned long long LONG;
const int N = 1e5 + 5;
const int INF = 0x3f3f3f3f;
const int MAXINT = 2147483647;
const int mod = 1000000007;
const long long MAXLONG = 9223372036854775807;
using namespace std;
typedef pair<int, int> PII;
#define ft fisrt
#define sd second
#define eb emplace_back
#define END '\n'

template <class T>
inline bool Read(T &ret)
{
	char c;
	int sgn;
	if (static_cast<void>(c = getchar()), c == EOF)
		return 0;
	while (c != '-' && (c < '0' || c > '9'))
		c = getchar();
	sgn = (c == '-') ? -1 : 1;
	ret = (c == '-') ? 0 : (c - '0');
	while (static_cast<void>(c = getchar()), c >= '0' && c <= '9')
		ret = ret * 10 + (c - '0');
	ret *= sgn;
	return 1;
}

template <class T>
inline void Write(T x)
{
	if (x < 0)
		putchar('-'), Write(x);
	if (x > 9)
		Write(x / 10);
	putchar(x % 10 + '0');
}

void solve(int question_num)
{
	while(question_num--){
		int n;cin>>n;
		cout<<n*2*3.1415926;
	}
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int t = 1;
	// cin >> t;
	solve(t);
	return 0;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
#define rep(i,N) for(int i=0;i<(N);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
using namespace std;
const long long MOD = 1e9 + 7;
const long long INF = 1e12;
const int inf = 1e9;
typedef long long ll;
typedef pair<ll,int> P;
typedef set<int> S;
const double PI=3.14159265358979323846;
int main(){
    int r;
    cin>>r;
    printf("%.5lf\n",2*r*PI);
    return 0;
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
/* typedef */
typedef long long ll;
typedef pair<int, int> pii;
/* constant */
const int INF = 1 << 30;
const ll LINF = 1LL << 50;
const int NIL = -1;
const int MAX = 10000;
const int mod = 1000000007;
const double pi = 3.141592653589;
/* global variables */
/* function */
/* main */
int main(){
    long double x;
    cin >> x;
    cout << fixed << setprecision(10) << x * 2 * pi << '\n';
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
void main()
{
  float r;
  cin>>r;
  cout<<2*(22/7)*r;
}

Compiler output:
a.cc:2:1: error: '::main' must return 'int'
    2 | void main()
      | ^~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>r;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<2*(22/7)*r;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int r;
    cin >> r;

    double ans = 2 * r * 3.141592;

    cout << ans;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;

void solve() {
    int R; cin >> R;
    cout << M_PI * 2 * R << '\n';
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    solve();
    return 0;
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

use proconio::input;
#[allow(unused_imports)]
use proconio::marker::*;

fn main() {
    input! {
        r: f64,
    }
    println!("{}", r * 2. * std::f64::consts::PI);
}


Compiler output:
main.c:1:1: error: unknown type name 'use'
    1 | use proconio::input;
      | ^~~
main.c:1:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '::' token
    1 | use proconio::input;
      |             ^~
main.c:2:2: error: invalid preprocessing directive #[
    2 | #[allow(unused_imports)]
      |  ^
main.c:3:1: error: unknown type name 'use'
    3 | use proconio::marker::*;
      | ^~~
main.c:3:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '::' token
    3 | use proconio::marker::*;
      |             ^~
main.c:5:1: error: unknown type name 'fn'
    5 | fn main() {
      | ^~
main.c: In function 'main':
main.c:6:5: error: 'input' undeclared (first use in this function); did you mean 'int'?
    6 |     input! {
      |     ^~~~~
      |     int
main.c:6:5: note: each undeclared identifier is reported only once for each function it appears in
main.c:6:10: error: expected ';' before '!' token
    6 |     input! {
      |          ^
      |          ;
Language: C

#include<bits/stdc++.h>

using namespace std;

typedef long long int ll;

void solve()
{
	int r;
	cin >> r;
	cout << fixed << setprecision(3) << 2*3.141592*r;
}

int main()
{
	int t = 1;
	//cin >> t;
	for(int i = 0; i < t; i++)
	{
		//cout << "Case #" << i + 1 << ": ";
		solve();
	}
	return 0;
}



Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
int r;
double c;
int main(){
	cin >> r;
	c = 2 * 3.14159265 * r;
	cout << c;
	return 0;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;

int main(){
int R;
  cin >> R;
  
cout << R*2*3.141592 << endl;
  
}




Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

r=int(input())
l=r*6.28318530717958623200
print(l)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | r=int(input())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'r' [-Wimplicit-int]
main.c:1:3: error: expected expression before 'int'
    1 | r=int(input())
      |   ^~~
Language: C

N=int(input()) 
  print(N*2*3.1415)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | N=int(input())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'N' [-Wimplicit-int]
main.c:1:3: error: expected expression before 'int'
    1 | N=int(input())
      |   ^~~
Language: Java

public class Sample {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int R = sc.nextInt();
//        int b = sc.nextInt();
//        String s = sc.next();
//        if ((a * b) % 2 == 0)
//            System.out.println("Even");
//        else
//            System.out.println("Odd");
        System.out.println(Math.PI * R);
        
	}
}

Compiler output:
Main.java:1: error: class Sample is public, should be declared in a file named Sample.java
public class Sample {
       ^
Main.java:7: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Sample
Main.java:7: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Sample
3 errors
Language: C

import sys
import re
from collections import deque, defaultdict, Counter
from math import ceil, sqrt, hypot, factorial, pi, sin, cos, radians
from itertools import accumulate, permutations, combinations, product
from operator import itemgetter, mul
from copy import deepcopy
from string import ascii_lowercase, ascii_uppercase, digits
from bisect import bisect, bisect_left
from fractions import gcd
from heapq import heappush, heappop
from functools import reduce
def input(): return sys.stdin.readline().strip()
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))
sys.setrecursionlimit(10 ** 9)
INF = float('inf')
mod = 10 ** 9 + 7

R = INT()
print(2 * R * pi)




Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import sys
      | ^~~~~~
main.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'import'
    2 | import re
      | ^~~~~~
main.c:2:1: error: unknown type name 'import'
main.c:18:13: warning: multi-character character constant [-Wmultichar]
   18 | INF = float('inf')
      |             ^~~~~
Language: C

#include <bits/stdc++.h>
using namespace std;

int main() {
  int r;
  cin >> r;
  cout << 2*r*3.14 << endl;
  
  return(0);
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
#define db(x) cerr << __LINE__ << ": " << #x << " = " << (x) << endl;
#define ll long long
#define ld long double
#define pll pair<ll, ll>
#define MOD 1000000007
#define FOR(i, n) for(ll i = 0; i < n; i++)
using namespace std;
const long long INF = 3*1e18;

int main() {
    ios::sync_with_stdio(0);    
    cin.tie(0);
    ll r;
    cin >> r;
    double ans = 2 * 3.1415926 * r;
    cout << ans << "\n";
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
#define PI 3.1416
int main(){
    int r;
    cin>>r;
    cout<<2*PI*r<<endl;

}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>

using namespace std;

int main(){
  double R;
  cin >> R;
  cout << 2*R*3.1415926535 << endl;
  return 0;
}


Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include<iomanip>
using namespace std;

#define PI 3.14159265359

int main(){
    long long R;
    cin >> R;
    cout << fixed << setprecision(10) << 2*PI*R << endl;
    system("pause");
    return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:12:14: error: expected '}' at end of input
   12 |     return 0;
      |              ^
a.cc:7:11: note: to match this '{'
    7 | int main(){
      |           ^
Language: C

#include <iostream>
#include <string>
#include <map>
#include <vector>
#include <algorithm>
#include <iostream>
#include <string>
#include <map>
#include <vector>
#include <algorithm>
#include <cmath>
using namespace std;
#define ll long long
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define Graph vector<vector<int>>;
#define iterG(next_v, G, v) for(auto next_v : G[v]
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int r;
    cin >> r;
    cout << 2 * r * M_PI << endl;
    return 0;
}



Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;

int main()
{
	double r;
	cin >> r;
	printf("%.6f\n", r * 2 * 3.141592);
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#define _USE_MATH_DEFINES

#include <iostream>

using namespace std;

int main()
{
	int n;
	cin >> n;
	printf("%.10f\n", 2 * n * M_PI);

	return 0;
}

Compiler output:
main.c:3:10: fatal error: iostream: No such file or directory
    3 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long
#define vll vector<ll>
#define vi vector<int>
#define pb push_back
#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define mii map<int,int>
#define mll map<ll,ll>
#define all(x) (x).begin(),(x).end()
#define S(x) (int)(x).size()
#define L(x) (int)(x).length()
#define trace(x) cerr<<#x<<" is "<<x<<'\n';

const int mod = 1e9+7;
const ll infl = 0x3f3f3f3f3f3f3f3fLL;
const int infi = 0x3f3f3f3f;

void solve()
{
	long double r;
	cin>>r;
	cout<<r*M_PIl*2;
}

int main()
{
	IOS
	int t=1;
	//cin>>t;
	while(t--)
	{
		solve();
	}
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define REP(i,n) for(ll i=0;i<(ll)(n);i++)
#define REPD(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define FOR(i,a,b) for(ll i=(a);i<=(b);i++)
#define FORD(i,a,b) for(ll i=(a);i>=(b);i--)
#define ALL(x) (x).begin(),(x).end()
#define ALLR(x) (x).rbegin(),(x).rend()
#define SIZE(x) ((ll)(x).size())
#define MAX(x) *max_element(ALL(x))
#define MIN(x) *min_element(ALL(x))
#define SORTR(x) sort(ALLR(x))
#define SORT(x) sort(ALL(x))
#define SUM(x) accumulate(ALL(A), 0)
#define EACH(i,x) for(typeof((x).begin()) i=(x).begin(); i!=(x).end(); ++i)
typedef vector<ll> VI;
typedef vector<VI> VVI;
typedef vector<char> VC;
typedef vector<VC> VVC;
typedef vector<string> VS;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
template <class BidirectionalIterator>
bool next_partial_permutation(BidirectionalIterator first, BidirectionalIterator middle,BidirectionalIterator last){reverse(middle, last); return next_permutation(first , last);}


void Main()
{
	double R;
	double length;
	cin>>R;
	length=2*M_PI*R;
	cout << length << "\n";
	return;
}

int main()
{
	std::cin.tie(0);
	std::ios_base::sync_with_stdio(false);
	std::cout << std::fixed << std::setprecision(15);
	Main();
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
using namespace std;

int main(){
    float r;
    cin >> r;
    float pi=3.141592;
    cout << 2*r*pi << endl;
}


Compiler output:
main.c:1:9: fatal error: iostream: No such file or directory
    1 | #include<iostream>
      |         ^~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
#include <string>
#include <stdlib.h>
#include <algorithm>
#include <math.h>
using namespace std;

int main(void) {
    const double PI=3.14159;
    
    int r;
    
    cin >> r;
    
    cout << 2*PI*r << endl;
    
    
    
    
    return 0;
}

Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
//<<setprecision(30)
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define rep1(i, n) for (ll i = 1; i < (ll)(n); i++)
#define INF 1000000000000
#define MOD 1000000007
using ll = long long;
using Graph = vector<vector<int>>;

int main(){
  double R; cin>>R;
  doubel pi = 6.28318530717958623200;
  cout<<R*pi<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:3: error: 'doubel' was not declared in this scope; did you mean 'double'?
   13 |   doubel pi = 6.28318530717958623200;
      |   ^~~~~~
      |   double
a.cc:14:11: error: 'pi' was not declared in this scope
   14 |   cout<<R*pi<<endl;
      |           ^~
Language: C

#include<iostream>
#include<string>
#include<vector>
#include<utility>
#include<algorithm>
#include<map>
#include<cstdlib>
#include<cmath>
#include<numeric>
#include<iomanip>
using namespace std;
using ll =long long;
const int MOD = 1000000007;

/*

struct mint {
	int x;
	mint(int x = 0) :x((x% MOD + MOD) % MOD) {}
	mint operator-() const {
		return mint(-x);
	}
	mint& operator+=(const mint a) {
		if ((x += a.x) >= MOD)x -= MOD;
		return *this;
	}
	mint & operator-=(const mint a) {
		if ((x += MOD - a.x) >= MOD)x -= MOD;
		return *this;
	}
	mint & operator*=(const mint a) {
		(x *= a.x) %= MOD;
		return *this;
	}
	mint operator+(const mint a)const {
		return mint(*this) += a;
	}
	mint operator-(const mint a)const {
		return mint(*this) -= a;
	}
	mint operator*(const mint a)const {
		return mint(*this) *= a;
	}
	mint pow(int t)const {
		if (!t)return 1;
		mint a = pow(t >> 1);
		a *= a;
		if (t & 1)a *= *this;
		return a;
	}
	
	//for prime mod
	mint inv() const {
		return pow(MOD - 2);
	}
	mint& operator/=(const mint a) {
		return (*this) *= a.inv();
	}
	mint operator/(const mint a)const {
		mint res(*this);
		return res /= a;
	}
};
*/
int main() {
	ll R;
	cout << R * 3.14195;


}

Compiler output:
main.c:1:9: fatal error: iostream: No such file or directory
    1 | #include<iostream>
      |         ^~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pint = pair<ll, ll>;

int main(int argc, char **argv)
{
	ll R; cin >> R;
	std::cout << fixed << setprecision(10) << R*2*M_PI<< std::endl;
}



Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

import math
r = int(input())
ans = 2 * r * math.pi
print(ans)

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'r'
    2 | r = int(input())
      | ^
Language: C

#define _USE_MATH_DEFINES

#include<cstdio>
#include<cmath>
#include<string>
#include<vector>
#include<algorithm>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<cstring>

using namespace std;

int main()
{
	int n;

	scanf("%d", &n);

	printf("%.10lf\n", M_PI*(double)(n * 2));

	return 0;
}

Compiler output:
main.c:3:9: fatal error: cstdio: No such file or directory
    3 | #include<cstdio>
      |         ^~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
#define sz(x) int(x.size())
#define pb push_back
using ll=long long;
const ll MOD=1000000007;



int main() {
    double R;
    cin>>R;
    //小数第10位まで出力
cout<<fixed<<setprecision(10);
    cout<<R*2*3.1415926535<<endl;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds; 
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 
#define ll long long
#define ld long double
#define MAX 1000000000
int main(){
	ios_base::sync_with_stdio(false);
    cin.tie(NULL);
	int t=1;
	//cin>>t;
	for(int cc=1;cc<=t;cc++){
        //cout<<"Case #"<<cc<<": ";
        ld r;
        cin>>r;
        cout<<(2*M_PI*r)<<endl;

	}
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

// WeirdBugsButOkay

# include <bits/stdc++.h>
 
# define ll long long
# define ld long double
# define pii pair <int,int>
# define pll pair <ll,ll>
# define mp make_pair
# define pb push_back
# define ff first
# define ss second
# define endl '\n'
 
using namespace std;

ll pow3(ll a, ll b, ll m = 1000000007)
{
    ll res = 1;
    while(b > 0)
    {
        if(b & 1)
            res = (res * a) % m;
        a = (a * a) % m;
        b >>= 1;
    }
    return res;
}

void solve()
{
    ld pi = 3.1415926;
    ll r;
    cin >> r;
    cout << setprecision(10) << 2.0 * pi * r;
    
}

 
int main()
{
    ios_base :: sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    ll q = 1;
    //cin >> q;
    for(ll i = 0; i < q; i++)
    {
        solve();
    }
    return 0;
}

Compiler output:
main.c:3:11: fatal error: bits/stdc++.h: No such file or directory
    3 | # include <bits/stdc++.h>
      |           ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
#include <iomanip>
#define ll long long
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define vi vector <ll> 
#define qu queue <ll>
#define min_3(a,b,c) min(a,min(b,c))
#define max_3(a,b,c) max(a,max(b,c))
#define nout(ans) cout << (ans) << "\n"
#define sout(ans) cout << (ans) << " "
using namespace std;

/*
Decimal Places: cout << fixed << setprecision(n) << ans << endl;
*/

bool compare(const pair<int, int>&i, const pair<int, int>&j)
{
    return i.second < j.second;
}


void solve()
{
    float r; cin >> r;
    nout(2*r*3.1415);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    int t = 1;
    //cin >> t;
    while (t--)
    {
        solve();
    }
    return 0;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

// Optimise
#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#include "/home/shahraaz/bin/debug.h"
#else
#define db(...)
#endif

using ll = long long;
#define f first
#define s second
#define pb push_back
#define all(v) v.begin(), v.end()

const int NAX = 2e5 + 5, MOD = 1000000007;

class Solution
{
private:
public:
    Solution() {}
    ~Solution() {}
    void solveCase()
    {
        int n;
        cin >> n;
        cout << fixed << setprecision(9);
        cout << acos(-1) * 2 * n;
    }
};

int32_t main()
{
#ifndef LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif
    int t = 1;
    // cin >> t;
    Solution mySolver;
    for (int i = 1; i <= t; ++i)
    {
        mySolver.solveCase();
#ifdef LOCAL
        cerr << "Case #" << i << ": Time " << chrono::duration<double>(chrono::steady_clock::now() - TimeStart).count() << " s.\n";
        TimeStart = chrono::steady_clock::now();
#endif
    }
    return 0;
}


Compiler output:
main.c:2:10: fatal error: bits/stdc++.h: No such file or directory
    2 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i=0; i<n; i++)
#define rep1(i, n) for(int i=1; i<=n; i++)
#define repr(i, n) for(int i=n-1; i>=0; i--)
#define repr1(i, n) for(int i=n; i>=1; i--)
#define all(v) v.begin(),v.end()
using ll = long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
const int INF = 1e9;
const ll LLINF = 1e18;
const ll MOD = 1e9+7;
const double EPS = 1e-10;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

const double PI = acos(-1);

int main() {
    double r; cin >> r;
    cout << fixed << setprecision(10) << 2 * PI * r << endl;
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <math.h>
#include <queue>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
double ans;
ll N;



int main(){
    cin >> N;
    ans = M_PI * N;
    cout << ans << endl;
}

Compiler output:
main.c:2:10: fatal error: iostream: No such file or directory
    2 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
// -----------------<fast IO>------------------
#define IOS             ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define FLSH             fflush(stdout)
#define fileIO(name) \
    freopen(name".in", "r", stdin); \
    freopen(name".out", "w", stdout);
#define PRECISION(x)     cout << fixed << setprecision(x);
#define endl             "\n"
// -----------------<Container manipulation / traversal macros>------------------
#define mp                 make_pair
#define pb                 push_back
#define ff                 first
#define ss                 second
#define sz(x)             ((int)((x).size()))
#define all(x)             (x).begin(),(x).end()
#define rep(i,n)         for(ll (i)=0;(i)<(n);(i)++)
#define forn(i,a,b)     for(ll (i)=(a);(i)<=(b);(i)++)
#define fill(l,a)        memset((l) , (a) , sizeof(l))
// -----------------<Some common useful functions>------------------
#define maX(a,b)        ( (a) > (b) ? (a) : (b))
#define miN(a,b)        ( (a) < (b) ? (a) : (b))
#define checkbit(n,b)   ( (n >> b) & 1)
#define INDEX(arr,i)      ( lower_bound(all(arr),i)-arr.begin())
#define in(b,a)         ( (b).find(a) != (b).end())
// -----------------<TypeDef Start>------------------
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> pii;
typedef vector<ll> vi;
typedef vector< std::vector<ll> > matrix;
typedef map<ll,ll> mii;
typedef vector<pii> vpii;
// -----------------<Constants>------------------
const int MAXN = 1000005;
const int SQRTN = 1003;
const int LOGN = 22;
const double PI=acos(-1);

const int INF=1e9;

int MOD = 1000000007;
const int FMOD = 998244353;
const double eps = 1e-9;
ll gcd(ll a,ll b)
{
    if(a==0)
    return(b);
    return(gcd(b%a,a));
}
ll lcm(ll a,ll b)
{
    return(a/gcd(a,b)*b);
}
/*ll power(ll a,ll b,ll p)
{
    ll res=1;
    a%=p;
    while(b>0)
    {
        if(b&1)
        res=res*a%p;
        a=a*a%p;
        b>>=1;
    }
    return(res);
}*/
/*ll b_search(ll arr[],ll n,ll s)
{
    ll l=0,r=n-1;
    while(l<=r)
    {
        ll mid=l+(r-l)/2;
        if(arr[mid]==s)
        return(mid);
        if(arr[mid]<s)
        l=mid+1;
        else
        r=mid-1;
    }
    return(-1);
}*/

void solve()
{
    ll n;
    cin>>n;
    double pi=3.141592653589793238;
    cout<<fixed<<setprecision(16)<<double(2*pi*n)<<endl;
}

int main()
{
    IOS
    ll t=1;
    //cin>>t;
    while(t--)
    {
        solve();
    }
    return(0);
}


Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<iostream>
#include<vector>
#include<algorithm>
#include<queue>
#include <iomanip>
using namespace std;

int main(){
    int n;
    cin>>n;
    cout<<2*n*3.1415<<endl;
    return 0;
}

Compiler output:
main.c:1:9: fatal error: iostream: No such file or directory
    1 | #include<iostream>
      |         ^~~~~~~~~~
compilation terminated.
Language: C

import math 
print(math.pi * 2 * int(input()))

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'print'
    2 | print(math.pi * 2 * int(input()))
      | ^~~~~
Language: C

#include<bits/stdc++.h>
#include<unordered_set>
#include<unordered_map>
#include <algorithm> 
#include <iostream>
#include <string>
#include <cmath>
using namespace std;
#define ll long long
#define rep(i, n) for (ll i = 0; i < (n); i++)
#define FOR(i,a,b) for(ll i=(a);i<(b);i++)
#define FORR(i,a,b)for(ll i=(a);i<=(b);i++)
#define repR(i,n) for(ll i=n;i>=0;i--)
#define all(v)(v).begin(),(v).end()
#define rall(v)(v).rbegin(),(v).rend()
#define F first
#define S second
#define pb push_back
#define pu push
#define COUT(x) cout<<(x)<<endl
#define PQ priority_queue<ll>
#define PQR priority_queue<ll,vector<ll>,greater<ll>>
#define YES(n) cout << ((n) ? "YES" : "NO"  ) << endl
#define Yes(n) cout << ((n) ? "Yes" : "No"  ) << endl
#define mp make_pair
#define maxs(x,y) (x = max(x,y))
#define mins(x,y) (x = min(x,y))
#define sz(x) (ll)(x).size()
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const ll MOD = 1000000007LL;
const ll INF = 1LL << 60;
using vll = vector<ll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vvll = vector<vll>;
using vstr = vector<string>;
using pll = pair<ll, ll>;
using vc = vector<char>;
using vvc = vector<vc>;
template<class T> inline bool chmax(T& a, T b) { 
 if (a < b) { a = b; return true; } return false; 
}
template<class T> inline bool chmin(T& a, T b) {
 if (a > b) { a = b; return true; } return false; 
}
ll dx[4]={0,1,0,-1};
ll dy[4]={1,0,-1,0};
int main(){
  cout << fixed << setprecision(10);
  ll n;
  cin>>n;
  COUT(2.0*3.14*n);
}

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(int)(n);i++)

int main(){
    int R;
    cin >> R;

    cout << R*2*3.141592 << endl;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
#include <cmath>
#include <vector>
#include <string>
#include <algorithm>

using namespace std;

#define INF 1e9
#define MAXN 100005
#define MAXM 100005
#define ll long long
#define vi vector<int>
#define vll vector<long long>
#define rep(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define pii pair<int, int>

const double PI=3.14159265358979323846;

double R;

void solve(){
    cout << 2*PI*R << endl;
}

int main(){
    cin >> R;

    solve();
}


Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

import math
R=int(input())
print(2*math.pi*R)

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'R'
    2 | R=int(input())
      | ^
Language: C

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
  double R;
  cin >> R;
  cout << R*2*3.14159265358979323846;
}


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <algorithm>
#include <cmath>
using namespace std;
#define MAXN 1000100
#define ll long long
#define inf 1000000000
double n,m, pi;
int main()
{
	pi = 3.1415926535;
	scanf("%lf",&n);
	n = n*2.0*pi;
	printf("%.6lf\n",n);
	
	return 0;
}

Compiler output:
main.c:1:10: fatal error: cstdio: No such file or directory
    1 | #include <cstdio>
      |          ^~~~~~~~
compilation terminated.
Language: C++

// #include <boost/multiprecision/cpp_int.hpp> 
// using namespace boost::multiprecision; 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define f first
#define s second
#define pb push_back
#define REP(i,a,b) for(long long int i=a ; i<b ; i++)
#define mp make_pair
#define INF 1000000000000000000
#define mod 1000000007
#define pi pair<ll,ll>
#define pd pair<ld,ld>
#define vi vector<ll>
#define vd vector<ld>
#define vvi vector<vi>
#define vvd vector<vd>
#define vpi vector<pi>
#define vpd vector<pd>
#define us unordered_set<ll>
#define um unordered_map<ll,ll>
#define sortA(a) sort(a.begin(),a.end())
#define sortD(a) sort(a.begin(),a.end(),greater<ll>())
#define all(a) a.begin(),a.end()
#define N 100005


#include <ext/pb_ds/assoc_container.hpp> 
using namespace __gnu_pbds; 
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> new_data_set; 
#define in insert
#define fbo find_by_order
#define ook order_of_key


void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

ll powmod(ll x,ll y)
{
	if(x==0)
		return 0;
	if(y==0 || x==1)
		return 1;
	if(y%2==0)
		return powmod((x*x)%mod,y/2)%mod;
	return (x*powmod(x,y-1)%mod)%mod;
}
void print1D(vi a)
{
	for(ll i=0;i<a.size();++i)
	{
		cout<<a[i]<<" ";
	}
	cout<<endl;
}
void print2D(vector<vi> a)
{
	for(ll i=0;i<a.size();++i)
	{
		for(ll j=0;j<a[i].size();++j)
		{
			cout<<a[i][j]<<" ";
		}
		cout<<endl;
	}
}
void solve()
{
	ld n;
	cin>>n;
	ld pi=3.141592653589793238;
	cout<<(2*pi*n);
}
int main()
{
	ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
	ll t=1;
	// cin>>t;
	while(t--)
	{
		solve();
	}
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:98:14: error: invalid declarator before '=' token
   98 |         ld pi=3.141592653589793238;
      |              ^
a.cc:99:20: error: expected primary-expression before '*' token
   99 |         cout<<(2*pi*n);
      |                    ^