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

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <cctype>
#include <cassert>
#include <climits>
#include <string>
#include <bitset>
#include <cfloat>
#include <unordered_set>
#include <unordered_map>
#include <iomanip>
//#pragma GCC optimize("Ofast")
//#define _GLIBCXX_DEBUG
using namespace std;
typedef long double ld;
typedef long long int ll;
typedef unsigned long long int ull;
//#define int ll
typedef vector<int> vi;
typedef vector<char> vc;
typedef vector<bool> vb;
typedef vector<double> vd;
typedef vector<string> vs;
typedef vector<ll> vll;
typedef pair<int,int> pii;
typedef vector<pair<int,int> > vpii;
typedef vector<vector<int> > vvi;
typedef vector<vector<char> > vvc;
typedef vector<vector<string> > vvs;
typedef vector<vector<ll> > vvll;
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define irep(it, stl) for(auto it = stl.begin(); it != stl.end(); it++)
#define drep(i,n) for(int i = (n) - 1; i >= 0; --i)
#define fin(ans) cout << (ans) << '\n'
#define mp(p,q) make_pair(p, q)
#define pb(n) push_back(n)
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define floatprec(dig) fixed << setprecision(dig)
#define Sort(a) sort(a.begin(), a.end())
#define Rort(a) sort(a.rbegin(), a.rend())
#define MATHPI acos(-1)
#define itn int;
#define invar(typ, var) typ var; cin >> var;
int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
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;}
struct io{io(){ios::sync_with_stdio(false);cin.tie(0);}};
const int INF = INT_MAX / 2;
const ll LLINF = 1LL<<60;
constexpr ll MOD = 1000000007;
const double EPS = 1e-9;

signed main(void) {
  cin.tie(0); ios::sync_with_stdio(false);
  
  ll R;
  cin >> R;
  fin(((double)R * 2 * MATHPI));
}

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

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <math.h>
#include <queue>
#include <stack>
#include <cctype>
#include <cassert>
#include <climits>
#include <string>
#include <bitset>
#include <cfloat>
#include <unordered_set>
#include <unordered_map>
#include <iomanip>
//#pragma GCC optimize("Ofast")
//#define _GLIBCXX_DEBUG
using namespace std;
typedef long double ld;
typedef long long int ll;
typedef unsigned long long int ull;
//#define int ll
typedef vector<int> vi;
typedef vector<char> vc;
typedef vector<bool> vb;
typedef vector<double> vd;
typedef vector<string> vs;
typedef vector<ll> vll;
typedef pair<int,int> pii;
typedef vector<pair<int,int> > vpii;
typedef vector<vector<int> > vvi;
typedef vector<vector<char> > vvc;
typedef vector<vector<string> > vvs;
typedef vector<vector<ll> > vvll;
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define irep(it, stl) for(auto it = stl.begin(); it != stl.end(); it++)
#define drep(i,n) for(int i = (n) - 1; i >= 0; --i)
#define fin(ans) cout << (ans) << '\n'
#define mp(p,q) make_pair(p, q)
#define pb(n) push_back(n)
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define floatprec(dig) fixed << setprecision(dig)
#define Sort(a) sort(a.begin(), a.end())
#define Rort(a) sort(a.rbegin(), a.rend())
#define MATHPI acos(-1)
#define itn int;
#define invar(typ, var) typ var; cin >> var;
int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
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;}
struct io{io(){ios::sync_with_stdio(false);cin.tie(0);}};
const int INF = INT_MAX / 2;
const ll LLINF = 1LL<<60;
constexpr ll MOD = 1000000007;
const double EPS = 1e-9;

signed main(void) {
  cin.tie(0); ios::sync_with_stdio(false);
  
  ll R;
  cin >> R;
  fin(((double)R * 2 * MATHPI));
}

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;
#define Hello ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define endl '\n'
const double pi = acos(-1);
int main()
{
    Hello
    //2pir
    int n;
    cin >> n;
    cout << fixed << setprecision(2) << 2.0 * pi * 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++

#include <bits/stdc++.h>
#define S second
#define F first
#define ll long long
#define ld long double

using namespace std;

const ll N = 2e5 + 5, M = N * 2;

int main()
{
    ll r;
    scanf("%lld", &r);
    ld ans = 2 * acos(-1) * r;
    __mingw_printf("%.3Lf\n", ans);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: '__mingw_printf' was not declared in this scope
   16 |     __mingw_printf("%.3Lf\n", ans);
      |     ^~~~~~~~~~~~~~
Language: Java

import java.util.Scanner;
public class Test {
    private static double pi =3.14;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        double b = a*2*pi;
        System.out.println(b);
        
    
}


}


Compiler output:
Main.java:2: error: class Test is public, should be declared in a file named Test.java
public class Test {
       ^
1 error
Language: Java

package test;

import java.util.Scanner;

/**
 *
 * @author Masaya Misaizu
 */
public class Test {
    private static double pi =3.14;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        double b = a*2*pi;
        System.out.println(b);
        
    
}


}


Compiler output:
Main.java:9: error: class Test is public, should be declared in a file named Test.java
public class Test {
       ^
1 error
Language: C

#include <bits/stdc++.h>
#define fin ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define ii pair<int,int>
#define F first
#define S second
#define pb push_back
#define pf push_front
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define fore(i,a,b) for(int i = a;i < b; i+= 1)
#define forr(i,a) for(int i = a; i >= 0; i--)
#define fori(i,m) for(auto i = m.begin(); i != m.end(); i++) 
#define w(t) while(t--)
#define sz(s) int(s.size())
#define cls(a,car) memset(a,car,sizeof (a))
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ii> vii;
const int N = 2 * 1e5 + 5;
const ll mod = 998244353;
const int INF = INT_MAX;
const ll INFCAD  = ll(INT_MAX) * 2 + 1;
const double E = 1e-9;
// fflush(stdout)
// cout << flush
// a + b = a ^ b + 2 * (a & b)
int main(){
    //freopen("in","r",stdin);
    //freopen("out","w",stdout);
    int r;
    cin >> r;
    cout << fixed << setprecision(12) << 2.0 * acos(-1) * 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

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

typedef long long ll;
typedef unsigned long long ull;
using namespace std;

#define FALSE printf("false\n");
#define TRUE printf("true\n");
#define all(x) (x).begin(),(x).end()
#define rep(i,n) for(int i = 0;(i) < ((int)(n));++(i))
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
#define test(a) cout<<"line:"<<__LINE__<<"["<<(#a)<<": "<<(a)<<"]"<<endl

const int INF = 1e9+7;
const ll INFL = 9*1e18;

const int dx[4] = { 1, 0, -1, 0 };
const int dy[4] = { 0, 1, 0, -1 };

// const int dx[8] = {1, 1, 0,-1,-1,-1, 0, 1};
// const int dy[8] = {0, 1, 1, 1, 0,-1,-1,-1};

#define SUM(vec) accumulate(all(vec),0LL) // 配列の中身を全部足す
template<typename T>void print(T&& x){cout<<x<<endl;}// 改行付き出力
ll inline digit(ll num){int tmp = 0;while(num){tmp++;num/=10;}return tmp;} // 桁数
template<typename T>inline T digitSum(T num){T sum = 0;while(num){sum+=num%10;num/=10;}return sum;} // 各桁の和
template<typename T>inline T gcd(T a,T b){if(b == 0)return a;return gcd(b,a%b);} // 最大公約数
template<typename T>inline T lcm(T a, T b){T g = gcd(a,b);return a/g*b;} // 最小公倍数
template<typename T>inline T power(T a,T b){T tmp=1;rep(i,b){tmp*=a;}return tmp;} // 累乗
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; }
int ctoi(char c){return c-'0';}

// TODO: write
int main() {
  int n;cin>>n;
  printf("%.6lf\n",n*2*3.1415926535897932384626433832795028841);
  return 0; 
}


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

#include <algorithm>
#include <iostream>
#include <cmath>

using namespace std;

int main() {
	int r; cin >> r;
	printf("%.20f\n", M_PI * r * 2);
	return 0;
}


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

#include <algorithm>
#include <iostream>
#include <cmath>

using namespace std;

int main() {
	int r; cin >> r;
	cout << M_PI * r * 2 << '\n';
	return 0;
}


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

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

int main(){
	int n;
  	cin>>n;
  	double pi = 3.141592653589793238;
  cout<<2.0*pi*n<<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>
void main(){
double pi = 3.14159;
int radius;
std::cin >> radius;
std::cout << 2*pi*sqrt(radius);
return 0;
}

Compiler output:
a.cc:2:1: error: '::main' must return 'int'
    2 | void main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:6:19: error: 'sqrt' was not declared in this scope
    6 | std::cout << 2*pi*sqrt(radius);
      |                   ^~~~
Language: C++

#include<iostream>
#include<math>
void main(){
double pi = 3.14159;
int radius;
std::cin >> radius;
std::cout << 2*pi*math.sqrt(radius);
return 0;
}
 

Compiler output:
a.cc:2:9: fatal error: math: No such file or directory
    2 | #include<math>
      |         ^~~~~~
compilation terminated.
Language: C

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

#define speed ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
#define test ll t; cin>>t; while(t--)
#define ll long long
#define endl "\n"
#define all(v) v.begin(),v.end()
#define ff first
#define ss second
#define pb push_back
#define PI 3.1415926535897932384626
#define inf 1e18
#define vll vector<ll>
#define forn(i,n) for (int i = 0; i < int(n); i++)
#define fl(i,a,b) for(ll i=a;i<b;i++)
#define flr(i,a,b) for(ll i=a;i>b;i--)
#define db(x) cout << '>' << #x << ':' << x << endl;
#define print(v) for(auto i=v.begin();i!=v.end();i++){cout<<*i<<" ";}cout<<"\n";
#define MOD 1000000007
const ll N = 2e5;

int main()
{
    speed;
    double l;
    cin>>l;
    cout.precision(20); cout<<fixed; 
    cout<<2*PI*l<<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: Java

import java.util.*;

public class Solution {

    
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int r = scan.nextInt();
        System.out.println(2 * Math.PI * r);
    }
}

Compiler output:
Main.java:3: error: class Solution is public, should be declared in a file named Solution.java
public class Solution {
       ^
1 error
Language: C

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
int main()
{
  double r; cin >> r;
  double ans = 2*r*M_PI;
  cout << fixed;
  cout << setprecision(20);
  cout << ans;
  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

/*********বিসমিল্লাহির রাহমানির রাহিম**********/

#include <bits/stdc++.h>
#define ll long long
#define PI 2 * acos(0)
#define FAST ios::sync_with_stdio(0), cin.tie(0), cout.tie(0)
#define MAX 200000
#define MOD 1e7
#define all(x) (x).begin(), (x).end()
using namespace std;
/*................OMI.................*/

vector<ll> prime;
bool isPrime(ll n)
{
   if (n <= 1)
      return false;
   if (n <= 3)
      return true;

   if (n % 2 == 0 || n % 3 == 0)
      return false;

   for (ll i = 5; i * i <= n; i = i + 2)
      if (n % i == 0)
         return false;

   return true;
}
ll gcd(ll a, ll b)
{
   if (a == 0)
      return b;
   return gcd(b % a, a);
}

ll lcm(ll a, ll b)
{
   ll g = gcd(a, b);
   ll ans = (a * b) / g;
   return ans;
}
void primes(ll m)
{
   bool isprime[m];

   for (int i = 0; i <= m; i++)
      isprime[i] = true;

   for (int i = 3; i * i <= m; i++)
   {
      if (isprime[i])
      {

         for (int j = i * i; j <= m; j += i)
            isprime[j] = false;
      }
   }
   prime.push_back(2);
   for (int i = 3; i <= m; i += 2)
      if (isprime[i])
         prime.push_back(i);
}

/************MAIN_FUNCTION***********/

int main(int argc, char *argv[])
{

   FAST;
   double r;

   cin>>r;

   cout<<setprecision(23);
   cout<<2*PI*r<<endl;

   return 0;
}

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

//omajinai c++ atcoder
#include <iostream> 
#include <string> 
#include <vector> 
#include <algorithm> 
#include <utility> 
#include <tuple> 
#include <cstdint> 
#include <cstdio> 
#include <map> 
#include <queue> 
#include <set> 
#include <stack> 
#include <deque> 
#include <unordered_map> 
#include <unordered_set> 
#include <bitset> 
#include <cctype> 
#include<cmath>
#include<iomanip>
#include<type_traits>
//#include<numbers>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
#define itn int
#define yes() printf("Yes\n")
#define no() printf("No\n")
typedef long long ll;
constexpr auto mod = 1000000007;
using namespace std;

int main() {


    long double pi=3.141592653589793;
    double r;
    cin>>r;
    cout<<2*pi*r;
}

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

#include<iostream>
using namespace std;
int main()
{int n;
 cin>>n;
 cour<<3.1416*n*n;
 return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:2: error: 'cour' was not declared in this scope
    6 |  cour<<3.1416*n*n;
      |  ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{int n;
 cin>>n;
 cour<<3.1416*n*n;
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:2: error: 'cour' was not declared in this scope
    6 |  cour<<3.1416*n*n;
      |  ^~~~
Language: C

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define pii pair<int,int>
#define pli pair<long long int,int>
#define pbi pair<bool,int>
#define pob pop_back
#define all(a) a.begin(),a.end()
#define fio ios_base::sync_with_stdio(false); cin.tie(0);cout.tie(0);
#define i64 long long int
#define mem(x,y) memset(x,y,sizeof(x))
#define fill(arr,b) fill(arr, arr+sizeof(arr)/sizeof(arr[0]), b)
#define maxarr(n,arr,m) m =-1e9;for(int i=0;i<n;i++)if(arr[i]>m) m=arr[i];
#define read freopen("input.txt","r",stdin);

const double pi = acos(-1.0);
const int maxn = (i64)2e9+5;

int main()
{
   double r;
   scanf("%llf",&r);
   printf("%.15llf",2.0*pi*r);
   return 0;
}


Compiler output:
main.c:5:9: fatal error: bits/stdc++.h: No such file or directory
    5 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int r; cin >> r;
	cout << 3.14159 * 2 * r;
}

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;
    double f =3.14159;
c=2*f*r;
      cout << fixed << setprecision(5)<<c<<endl; 

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:1: error: 'c' was not declared in this scope
    8 | c=2*f*r;
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
 
 
int main()
{
   int r;
  cin>>r;
    double f =3.14159;
c=2*f*r;
      cout << fixed << setprecision(5)<<c<<endl; 

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:1: error: 'c' was not declared in this scope
   11 | c=2*f*r;
      | ^
Language: C

#include <bits/stdc++.h>
using namespace std;
 
 
 
int main()
{
   int r;
  cin>>r;
    double f =3.14159;
c=2*f*r;
      cout << fixed << setprecision(5)<<c<<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>

using namespace std;

using ll = long long;

int main(){
    ll a;
    cin >> a;
    cout << a * 3.14159265359 * 2;
    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 mod 1000000000
#define ll long long
#define _USE_MATH_DEFINES
using namespace std;
int main()
{
int r;
cin>>r;
cout<<2*M_PI*r;
}


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;

double const M_PI=3.14159265358979323846;

int main()
{
    //freopen("IN.txt","r",stdin);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    double r;
    cin>>r;
    cout<<2*M_PI*r;
    return 0;
}

Compiler output:
In file included from /usr/include/c++/14/cmath:47,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:114,
                 from a.cc:1:
a.cc:4:14: error: expected unqualified-id before numeric constant
    4 | double const M_PI=3.14159265358979323846;
      |              ^~~~
Language: Java

import java.util.*;
import java.io.*;
public class Solution
{
    static BufferedWriter bw;
    static BufferedReader br;
    static void solve()throws Exception
    {
        int r = Integer.parseInt(br.readLine());
        double result = 2 * 22/7.0 * r;
        bw.write(Double.toString(result));
        bw.newLine();
    }
    public static void main(String []args)throws Exception
    {
        br=new BufferedReader(new InputStreamReader(System.in));
        bw=new BufferedWriter(new OutputStreamWriter(System.out));
        // int t = Integer.parseInt(br.readLine());
        // for(int i=0;i<t;i++)
        // {
        //     bw.write("Case #"+(i+1)+": ");
            solve();
        // }
        br.close();
        bw.close();
    }
}


Compiler output:
Main.java:3: error: class Solution is public, should be declared in a file named Solution.java
public class Solution
       ^
1 error
Language: C

#include<iostream>
#include<vector>
#include<algorithm>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<math.h>
#include<bitset>
#include <numeric>
using namespace std;
using ll=long long;
using ld=long double;
using pint=pair<int,int>;
using pll=pair<ll,ll>;
#define LONG_INF 9223372036854775807
#define INF 1000000000LL
#define EPS 1e-10
#define rep(i, n) for(int i = 0; i < (int)n; i++)
#define dump(a) rep(d,a.size()){cout<<a[d];if(d!=a.size()-1)cout<<" ";else cout<<endl;}
#define all(v) v.begin(),v.end()
#define pb push_back

#define pi 3.14

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

    int R;
    cin >> R;
    cout << 2*R*3.14 << endl;

    return 0;
}

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;
 
int main()
{
 long double r,p;
  p=2*r*3.14;
  cout<<.2p;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: unable to find numeric literal operator 'operator""p'
    9 |   cout<<.2p;
      |         ^~~
Language: C

#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define se second
#define fi first
#define pb push_back

int main()
{
  ll r ;
  cin >> r  ;
  r = double(r) ;
  cout << 2*(3.1415)*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<bits/stdc++.h>

using namespace std;

int main()
{
 long double r,p;
  p=2*r*(22/7);
  cout<<p;
  
}

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 <unordered_map>
#include <unordered_set>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
 
/*** Template Begins ***/
 
typedef long long    ll;
typedef pair<ll,ll>  pll;
typedef pair<ll, pair<int, int> > plll;
typedef vector<long long>  vll;
typedef vector<pll>  vp;
typedef long double ld;
#define pb           push_back
#define INF          INT_MAX/10
#define F            first
#define S            second
#define mp           make_pair
// #define ios          ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define hell         1000000007LL
// #define h 998244353
#define all(a)       (a).begin(),(a).end()
ll power(ll x, ll y, ll p)
{
  ll res = 1;
  x = x % p;
  while (y > 0)
  { 
    if (y & 1) 
      res = (res*x) % p;
    y = y>>1;
    x = (x*x) % p;
  } 
  return res; 
} 
const int MAXN = 2e5+5;

// Debug //
#define trace(x)                 cerr << #x << ": " << x << endl;
#define trace1(x)                cerr << #x << ": " << x << endl;
#define trace2(x, y)             cerr << #x << ": " << x << " | " << #y << ": " << y << endl;
#define trace3(x, y, z)          cerr << #x << ": " << x << " | " << #y << ": " << y << " | " << #z << ": " << z << endl;
#define trace4(a, b, c, d)       cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << endl;
#define trace5(a, b, c, d, e)    cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << endl;
#define trace6(a, b, c, d, e, f) cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << " | " << #f << ": " << f << endl;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
template <typename T>
using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
const double eps=1e-8;
int dblcmp(double d){if (fabs(d)<eps)return 0;return d>eps?1:-1;}
ll euclid(ll x,ll y,ll a,ll b)
{
  return (a-x)*(a-x)+(b-y)*(b-y);
}
// Constants //
void solve()
{
  ld r;
  cin>>r;
  cout.precision(12);
  cout<<fixed<<M_PI*2*r<<endl;
}
int main()
{ 
  // ios;
  // freopen("inputt.txt", "w", stdout);
  ll t,i;
  t=1;

  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

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


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:1:5: error: expected expression before 'int'
    1 | r = int(input())
      |     ^~~
Language: C

#include <bits/stdc++.h>

using namespace std;

#define f first
#define s second
#define pb push_back
#define mp make_pair
#define all(v) v.begin(), v.end()
#define sz(v) (int)v.size()

#define MOO(i, a, b) for (int i=a; i<b; i++)
#define M00(i, a) for (int i=0; i<a; i++)
#define MOOd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define M00d(i,a) for (int i = (a)-1; i >= 0; i--)

#define FAST ios::sync_with_stdio(0); cin.tie(0);
#define finish(x) return cout << x << '\n', 0;
#define dbg(x) cerr << ">>> " << #x << " = " << x << "\n";
#define _<< " _ " <<

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int,int> pi;
typedef pair<ld,ld> pd;
typedef vector<ll> vll;
typedef pair<ll,ll> pll;

int main() { FAST
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ld pi = acos(-1);
	ld r;
	cin >> r;
	cout << r * 2.0 * pi << 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;
#define all(x) (x).begin(),(x).end()
#define endl '\n'
#define int long long
#define TT template <class T>

TT istream& operator>>(istream &I, pair<T,T>& p) {return I >> p.first >> p.second;}
TT ostream& operator<<(ostream &O, pair<T,T>& p) {return O << p.first << ' ' << p.second;}
TT istream& operator>>(istream &I, vector<T>& v) {for (T &e: v) I >> e; return I;}
TT ostream& operator<<(ostream &O, const vector<T>& v) {for (const T &e: v) O << e << ' '; return O;}



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


signed main() { //[J][O][L][S][K][E][Y]
        ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
//        freopen("input.txt", "r", stdin);
        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

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

int main(){
  double a ;
  cin >> a ;
  cout << (float) a * 6.28 << 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 mod 1000000007
#define ll long long int
#define ar array
#define mp make_pair
using namespace std;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	double r;
	cin>>r;
	cout<<fixed<<setprecision(20)<<double(2*double(22)/7*r)<<endl;
	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 main(){
  float a ;
  cin >> a ;
  cout << a * 6.28 << 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++

#define _USE_MATH_DEFINES
#include<cmath>
#include<iostream>
using namespace std;
int main()
{
  float r;
  r = M_PI*r*r;
  cout <<setprecision(3)<<r;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: 'setprecision' was not declared in this scope
    9 |   cout <<setprecision(3)<<r;
      |          ^~~~~~~~~~~~
a.cc:4:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    3 | #include<iostream>
  +++ |+#include <iomanip>
    4 | using namespace std;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  	float r;
	cin>>r;
  	r = M_PI*r*r
  	cout<<setprecision(4)<<r;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:7:21: error: expected ';' before 'cout'
    7 |         r = M_PI*r*r
      |                     ^
      |                     ;
    8 |         cout<<setprecision(4)<<r;
      |         ~~~~
Language: C

#include<bits/stdc++.h>
using namespace std; 
int main()
{
    #ifdef LOCAL
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
	double r;
	cin >> r;
	double ans = (2*r*22)/7;
	std::cout << std::setprecision(20);
	cout << ans << endl;
	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 main()
{
  	float r;
	cin>>r;
  	cout<<setprecision(4)<<<M_PI*r*r;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:7:32: error: expected primary-expression before '<' token
    7 |         cout<<setprecision(4)<<<M_PI*r*r;
      |                                ^
Language: C++

#include<bits/stdc++.h>
int main()
{
  	float r;
	cin>>r;
  	cout<<setprecision(4)<<<M_PI*r*r;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: 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:6:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |         cout<<setprecision(4)<<<M_PI*r*r;
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:15: error: 'setprecision' was not declared in this scope; did you mean 'std::setprecision'?
    6 |         cout<<setprecision(4)<<<M_PI*r*r;
      |               ^~~~~~~~~~~~
      |               std::setprecision
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:143:
/usr/include/c++/14/iomanip:202:3: note: 'std::setprecision' declared here
  202 |   setprecision(int __n)
      |   ^~~~~~~~~~~~
a.cc:6:32: error: expected primary-expression before '<' token
    6 |         cout<<setprecision(4)<<<M_PI*r*r;
      |                                ^
Language: C

#include<bits/stdc++.h>
using namespace std; 
int main()
{
    #ifdef LOCAL
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
	int r;
	cin >> r;
	double ans = (2*r*22)/7;
	cout << ans << endl;
	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>
int main()
{
  	float r;
	cin>>r;
  	cout<<setprecision(4)<<<M_PI*r*r;
}



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 <stiod.h>
int main(){
int r;
  scanf("%d", &r);
  printf("%d\n",r *6.28);
  return 0;
}


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

#include <stiod.h>
int main(){
int r;
  scanf("%d"< &r);
  printf("%d\n",r *6.28);
  return 0;
}

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

r = int(input())
print(r*r*3,1412)

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:1:5: error: expected expression before 'int'
    1 | r = int(input())
      |     ^~~
Language: C

/**
                 MD.Faysal Hasan
                Comilla Univesity               **/

#include<bits/stdc++.h>
#include<algorithm>
#include<cmath>
#include<string>
#include<stdlib.h>
using namespace std;

#define         rep(i,n)       for ( i=0 ; i<n ; ++i )
#define         rep1(i,n)      for ( i=1 ; i<=n ; ++i )
#define         sajo(str)      sort(str.begin(),str.end())
#define         rev(str)       reverse(str.begin(),str.end())
#define         usajo(str)     sort(str.rbegin(),str.rend())
#define         input(a)       for(auto &it : a) cin>>it
#define         pi             2*acos(0.0)
#define         nel            printf("\n")
#define         longmx         92233720368547758
#define         gcd(a,b)       __gcd(a,b)
#define         lcm(a,b)       (a/gcd(a,b))*b
#define         yes            cout<<"Yes"<<"\n"
#define         no             cout<<"No"<<"\n"
#define         vcl            vector<ll>
#define         vpl            vector<pair<ll,ll>>
#define         pb             push_back
#define         mkp(x,y)       make_pair(x,y)
#define         ff             first
#define         sc             second
#define         spc            ' '
#define         nn             '\n'
#define         ikarus_101     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
typedef         long long int  lli;
typedef         long long      ll;

int main(){ikarus_101

    ll ans,sum,tot,cnt,mx,mn,idx,chk,tmp,mid,lft,rgt,pos;
    ll tc,n,m,a,b,c,d,g,h,l,r,x,y,i,j,k;

    cin>>a;
    double rr=a;
    cout<<fixed<<setprecision(20)<<2.0*pi*rr<<nn;
    return 0;
}


Compiler output:
main.c:5:9: fatal error: bits/stdc++.h: No such file or directory
    5 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

/**
                 MD.Faysal Hasan
                Comilla Univesity               **/

#include<bits/stdc++.h>
#include<algorithm>
#include<cmath>
#include<string>
#include<stdlib.h>
using namespace std;

#define         rep(i,n)       for ( i=0 ; i<n ; ++i )
#define         rep1(i,n)      for ( i=1 ; i<=n ; ++i )
#define         sajo(str)      sort(str.begin(),str.end())
#define         rev(str)       reverse(str.begin(),str.end())
#define         usajo(str)     sort(str.rbegin(),str.rend())
#define         input(a)       for(auto &it : a) cin>>it
#define         pi             2*acos(0.0)
#define         nel            printf("\n")
#define         longmx         92233720368547758
#define         gcd(a,b)       __gcd(a,b)
#define         lcm(a,b)       (a/gcd(a,b))*b
#define         yes            cout<<"Yes"<<"\n"
#define         no             cout<<"No"<<"\n"
#define         vcl            vector<ll>
#define         vpl            vector<pair<ll,ll>>
#define         pb             push_back
#define         mkp(x,y)       make_pair(x,y)
#define         ff             first
#define         sc             second
#define         spc            ' '
#define         nn             '\n'
#define         ikarus_101     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
typedef         long long int  lli;
typedef         long long      ll;

int main(){ikarus_101

    ll ans,sum,tot,cnt,mx,mn,idx,chk,tmp,mid,lft,rgt,pos;
    ll tc,n,m,a,b,c,d,g,h,l,r,x,y,i,j,k;

    cin>>a;
    cout<<fixed<<setprecision(20)<<2.0*pi*double(a)<<nn;
    return 0;
}


Compiler output:
main.c:5:9: fatal error: bits/stdc++.h: No such file or directory
    5 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<iomanip>
#include<string.h>
using namespace std;
// log10(x)+1  number of digits 
void bubblesort(int arr[], int n);
int main()
{
	double pi = 3.14285714285714285714;
	int r;
	cin >> r;
	cout << fixed << setprecision(20) << 2 * pi*r;
}


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>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define ll long long
vector<int> 
using namespace std; 
signed
main()
{
double r;
cin>>r;
cout<<setprecision(9)<<2*3.141592653589793238*r;



		
}


Compiler output:
a.cc:7:1: error: 'vector' does not name a type
    7 | vector<int>
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:13:1: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   13 | 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:14:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   14 | cout<<setprecision(9)<<2*3.141592653589793238*r;
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:14:7: error: 'setprecision' was not declared in this scope; did you mean 'std::setprecision'?
   14 | cout<<setprecision(9)<<2*3.141592653589793238*r;
      |       ^~~~~~~~~~~~
      |       std::setprecision
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:143:
/usr/include/c++/14/iomanip:202:3: note: 'std::setprecision' declared here
  202 |   setprecision(int __n)
      |   ^~~~~~~~~~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
int main() {
	double k;
	cin>>k;
	k=(k*(22.0)*2)/7;
	cout<<k<<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>
using namespace std;
int main(void){
  long double r;
    cin>>r;
  long double result=2*3.1415926*r;
    cout<<result<<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;
    printf("%.20llf\n", r * 3.14159265358979323846264 * 2);
    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>
using namespace std;

int main() {
  int r;
  cin >> r;
  double leng;
  leng = r * 2 * M_PI;
  cout << leng << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: 'M_PI' was not declared in this scope
    8 |   leng = r * 2 * M_PI;
      |                  ^~~~
Language: C

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

#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define REP(i, n) for (int i = 1; i <= (int)(n); i++)
#define repi(i, s, n) for (int i = (s); i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
#define uniqueV(x)          \
  sort(x.begin(), x.end()); \
  x.erase(unique(x.begin(), x.end()), x.end());
#define debug(x) cerr << #x << ": " << x << '\n'
#define debug2(x, y) cerr << "(" << #x << ", " << #y << ") = " \
                          << "(" << x << ", " << y << ")" << '\n'

typedef long long int ll;
typedef pair<int, int> P;

const long long INF = 3e18 + 12;
const int inf = 1e9;

// ----------------------------------------------

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

  cout << fixed << setprecision(20);

  int n;
  cin >> n;

  cout << n * 2 * M_PI << 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 <algorithm>
#include<bits/stdc++.h>
#include <ios>
#include <iterator>
using namespace std;
#define ll long long
#define f(n)  for(int i=0;i<n;i++) 
#define pb push_back
#define mp make_pair
#define vi vector< int>
#define all(v)   v.begin(),v.end()  
#define take(n)   ll int n;cin>>n;
void speed (){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
 
int main() {
	speed();
 int r;
    cin>>r;
    double ans=6.28318530717958623200*r;
    cout.precision(20);
    cout<<fixed<<ans;
	return 0;
}

 

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

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MOD = (int)1e9+7;
const double PI = 3.14159265359;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
	double r ;
	cin>>r;
	cout<<2*PI*r;
	
	
	
	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;
typedef long long ll;
const int MOD = (int)1e9+7;
const double PI = 3.14159265359;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
	double r ;
	cin>>r;
	cout<<2*PI*r;
	
	
	
	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

#define __USE_MINGW_ANSI_STDIO
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
#include <unordered_set>
#include <unordered_map>

using namespace std;

typedef long long ll;
typedef long long ull;
typedef pair<int, int> ii;

#define all(v)		((v).begin()), ((v).end())
#define sz(v)		((int)((v).size()))
#define endl		"\n"
#define fx(n)		fixed<<setprecision(n)
#define mk			make_pair	

void File()
{
#ifndef ONLINE_JUDGE
	freopen("output.txt", "w", stdout);
	freopen("input.txt", "r", stdin);
#endif
#ifdef ONLINE_JUDGE
	/*freopen("output.txt", "w", stdout);
	freopen("pyramid.in", "r", stdin);*/
#endif
}
void fast()
{
	ios::sync_with_stdio(NULL);
	cout.tie(NULL);
	cin.tie(NULL);
	//File();
}
const double pi = 2 * acos(0.0);
const ll oo = 0x3f3f3f3f;
const int MOD = 1e9 + 7;
const int nn = 2e5 + 15;
int dx[8] = { 1, -1, 0, 0, 1, -1, 1, -1 };
int dy[8] = { 0, 0, 1, -1, 1, -1, -1, 1 };

int main()
{
	fast();
	double b;
	cin >> b;
	cout << fx(20) << 2 * pi*b << endl;
	return 0;
}

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

////基本の者ども
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const int INF =2000000000;
//////forども//////////////////////////////////////////
#define REP(i,n) for(int i = 0; i < int(n); i++)
#define REPR(i,n) for(int i = int(n); i >= 0; i--)
#define FOR(i,m,n) for(int i = int(m); i < int(n); i++)
#define FOREACH(x,a) for(auto& (x) : (a) )
////////////////////////////////////////////////////////////////
//cinおよびcout拡張
#define COUT(x) cout<<(x)<<endl
void CINT(){}
template <class Head,class... Tail>
void CINT(Head&& head,Tail&&... tail){
    cin>>head;
    CINT(move(tail)...);
}
#define CIN(...) int __VA_ARGS__;CINT(__VA_ARGS__)
#define LCIN(...) ll __VA_ARGS__;CINT(__VA_ARGS__)
#define SCIN(...) string __VA_ARGS__;CINT(__VA_ARGS__)
/////////////////////////////////////////////////////////////////
//////あまった
#define MP make_pair
#define ALL(v) v.begin(), v.end()
#define pb(a) push_back(a)



//メモ
	//vector<vector<要素の型>> 変数名(要素数1, vector<要素の型>(要素数2, 初期値))
	//vector<intなど> 変数名(要素数,初期値)
	//dfsではvector<vector<int>> g(n);で◎
void Main(){//本処理はココ
	//入力パート
 	//string ;
 	ll  r;
 	cin>>r;
 //答え出力パート
     cout<<r*2*M_PI;
     cout<<endl;
 }
int main(){//ここは前処理のゾーン
    //COMinit();//nCrするならON
    //Prime();//素数ならコレをon//PRIME_MAXとかisPrimeもいじろう
    //string a,b;
    //ll n,a;
    std::cout << std::fixed << std::setprecision(15);//浮動小数点絶対殺すマン
  	Main();
}


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 M (ll)(1e9+7)
#define EPS (double)(1e-12)
#define ll long long
#define N (ll)(2*1e5)



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

    double res;
    int value;

    cin >> value;

    res = (double)2*value*(double)M_PI;

    cout << setprecision(10) << fixed << res << 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>

using namespace std;

#define M (ll)(1e9+7)
#define EPS (double)(1e-12)
#define ll long long
#define N (ll)(2*1e5)

class Graph {
    
    public:
        int V;
        vector<int> *adj;
        bool *visited;

        Graph(int V) {
            this->V = V;
            adj = new vector<int>[V];
            visited = new bool(V);
            memset(visited, 0, V*sizeof(bool));
        }
        void addEdge(int u, int v) {
            adj[u].push_back(v);
            adj[v].push_back(u);
        }
        void dfs(int u);
        void bfs(int u);
};

void Graph::dfs(int u) {
    if(visited[u])
        return;
    visited[u] = true;
    cout << u << " ";

    for(auto a : adj[u]) {
        dfs(a);
    }
}

void Graph::bfs(int u) {
    queue<int> fila;

    fila.push(u);
    visited[u] = true;
    while(!fila.empty()) {
        int s = fila.front();
        cout << s << " ";
        fila.pop();

        for(auto a : adj[s]) {
            if(!visited[a]) {
                visited[a] = true;
                fila.push(a);
            }
        }
    }
}

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

    double res;
    int value;

    cin >> value;

    res = (double)2*value*(double)M_PI;

    cout << setprecision(10) << fixed << res << 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 <iostream>
using namespace std;

int main() {
  double r;
  cin >> r;
  cout << 2*3.1415926535*r;

Compiler output:
a.cc: In function 'int main()':
a.cc:7:28: error: expected '}' at end of input
    7 |   cout << 2*3.1415926535*r;
      |                            ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C

#include<bits/stdc++.h> 
//#define <- プログラムの文字列を置換する
//typedef <- 新しい型に名前を付けるためのキーワード

using namespace std;

#define MAX_N 1
#define INF 1000000000 //1e9

#define PI 3.14159265359

int main(){
    int r;
    cin >> r;
    double a = 2*PI*r ;
    cout << a << endl;
    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.