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

//#include <tourist>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> p;
const int INF = 1e9;
const ll LINF = ll(1e18);
const int MOD = 1000000007;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {-1, 0, 1, 0};
const int Dx[8] = {0, 1, 1, 1, 0, -1, -1, -1}, Dy[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
#define yes cout << "Yes" << endl
#define YES cout << "YES" << endl
#define no cout << "No" << endl
#define NO cout << "NO" << endl
#define rep(i, n) for (int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()
#define debug(v)          \
    cout << #v << ":";    \
    for (auto x : v)      \
    {                     \
        cout << x << ' '; \
    }                     \
    cout << endl;
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;
}
//cout<<fixed<<setprecision(15);有効数字15桁
//-std=c++14
//-std=gnu++17
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
double n, m;
vector<int> a;

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> n;
    cout << 2*n*3.1415926535 << "\n";
}


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

import java.util.*;

public class A163 {

	Scanner sc=new Scanner(System.in);
	double h=sc.nextDouble();
	double r=h*2*3.14;
	
    System.out.print(r);
}


Compiler output:
Main.java:9: error: <identifier> expected
    System.out.print(r);
                    ^
Main.java:9: error: <identifier> expected
    System.out.print(r);
                      ^
2 errors
Language: C

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

int main(){
    int R;
    cin >> R;
    double ans = 2 * M_PI * R;
    cout << ans << 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 <stdio.h>
#include<math.h>

int　main(){
  int a;
  float b;
  scanf("%d",&a);  
  b=2*a*pi;
  printf("%f",b);
  
  return 0;
}


Compiler output:
main.c:4:4: error: stray '\343' in program
    4 | int<U+3000>main(){
      |    ^~~~~~~~
main.c: In function 'main':
main.c:8:9: error: 'pi' undeclared (first use in this function)
    8 |   b=2*a*pi;
      |         ^~
main.c:8:9: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
#include<math.h>

int　main(){
  int a;
  float f;
  scanf("%d",&a);  
  b=2*a*pi;
  printf("%f",b);
  
  return 0;
}


Compiler output:
main.c:4:4: error: stray '\343' in program
    4 | int<U+3000>main(){
      |    ^~~~~~~~
main.c: In function 'main':
main.c:8:3: error: 'b' undeclared (first use in this function)
    8 |   b=2*a*pi;
      |   ^
main.c:8:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:9: error: 'pi' undeclared (first use in this function)
    8 |   b=2*a*pi;
      |         ^~
Language: C

#include <stdio.h>
#include<math.h>

int　main(){
  int a;
  float f;
  scanf("%d",&a);  
  b=a*a*pi;
  printf("%f",b);
  
  return 0;
}

Compiler output:
main.c:4:4: error: stray '\343' in program
    4 | int<U+3000>main(){
      |    ^~~~~~~~
main.c: In function 'main':
main.c:8:3: error: 'b' undeclared (first use in this function)
    8 |   b=a*a*pi;
      |   ^
main.c:8:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:9: error: 'pi' undeclared (first use in this function)
    8 |   b=a*a*pi;
      |         ^~
Language: C

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int r;
    cin>>r;
    cout<<2*3.14*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++

nclude <bits/stdc++.h>
using namespace std;
 
#pragma GCC optimize("Ofast")
#define rep(i,a,n) for(int i=a; i<n; i++)
typedef long long ll;
typedef pair<int,int> P;
const ll MOD = (int)1e9+7;
const ll INF = MOD*MOD;
const ll powll = 1LL<<1;
 
int main(){
	double a;cin >> a;
    cout << M_PI*a*2.00 << "\n";
}

Compiler output:
a.cc:1:1: error: 'nclude' does not name a type
    1 | nclude <bits/stdc++.h>
      | ^~~~~~
a.cc:7:9: error: 'pair' does not name a type
    7 | typedef pair<int,int> P;
      |         ^~~~
a.cc: In function 'int main()':
a.cc:13:18: error: 'cin' was not declared in this scope
   13 |         double a;cin >> a;
      |                  ^~~
a.cc:14:5: error: 'cout' was not declared in this scope
   14 |     cout << M_PI*a*2.00 << "\n";
      |     ^~~~
a.cc:14:13: error: 'M_PI' was not declared in this scope
   14 |     cout << M_PI*a*2.00 << "\n";
      |             ^~~~
Language: C

r = int(input())
print(r*6.28)


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;

#pragma GCC optimize("Ofast")
#define rep(i,a,n) for(int i=a; i<n; i++)
typedef long long ll;
typedef pair<int,int> P;
const ll MOD = (int)1e9+7;
const ll INF = MOD*MOD;
const ll powll = 1LL<<1;

int main(){
	double a;cin >> a;
    cout << M_PI*a*2.00 << "\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<iostrea>
using namespace std;
int main(){
  float p=3.1428;
  int r;cin>>r;
  cout<<(2*p*r);
  return 0;
}

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

/*▄███████▀▀▀▀▀▀███████▄
░▐████▀▒ЗАПУСКАЕМ▒▀██████▄
░███▀▒▒▒▒▒ДЯДЮ▒▒▒▒▒▒▀█████
░▐██▒▒▒▒▒БОГДАНА▒▒▒▒▒████▌
░▐█▌▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒████▌
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░▄▀▌░░░▀▀░░▌▐░░░▀▀░░▌▒▀▒█▌
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░▀▄▐▒▀▀▀▀▒▒▒▒▒▒▀▀▀▒▒▒▒▒▒█
░░░▀▌▒▄██▄▄▄▄████▄▒▒▒▒█▀
░░░░▄█████████████  █▒▒▐▌
░░░▀███▀▀████▀█████▀▒▌
░░░░░▌▒▒▒▄▒▒▒▄▒▒▒▒▒▒▐
░░░░░▌▒▒▒▒▀▀▀▒▒▒▒▒▒▒▐*/
#include <iostream>
#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <tuple>
#include <math.h>
#include <set>
#include <stack>
#include <bitset>
#include <map>
#include <queue>
#include <random>
#include <unordered_set>
#include <unordered_map>
#define DEBUG
#define fi first
#define se second
#define pqueue priority_queue
#define pb(x) push_back(x)
// #define endl '\n'
#define all(x) x.begin(), x.end()
#define int long long
#define mk(a, b) make_pair(a, b)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef vector<ull> vull;
typedef vector<ll> vll;
// typedef tuple<int, int, int> tiii;
typedef pair<int, int> pii;
typedef vector<pair<int, int> > vpii;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef vector< vector<int> > vvi;
typedef vector<char> vc;

const ll INF = 1e9;
const ll INFLL = 1e18;
const ll MOD = 1000000007;
// const ll MAXN = 3e5;
const ld eps = 1e-6;
const ld eps2 = 1e-9;
const ll MOD2 = 998244353;
const ll dosz = 5e5;
const ll SZ = (1<<18);
const ld PI = atan2l(0, -1);


void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#ifdef DEBUG
        // freopen("a.in", "r",stdin);
#else
       // freopen("input.txt", "r", stdin);
       // freopen("output.txt", "w", stdout);
#endif
}

void solve(){
    ld r;
    cin >> r;
    cout << 2*r*PI << endl;
}

signed main() {
    fast_io();
    int q = 1;
    cout << fixed << setprecision(6);
    // cin >> q;
    while(q--){
        solve();
    }
    return 0;
}
 

Compiler output:
a.cc:97:1: error: extended character   is not valid in an identifier
   97 |  
      | ^
a.cc:97:1: error: '\U000000a0' does not name a type
   97 |  
      | ^
Language: C

#include<bits/stdc++.h>
using namespace std;
#define int long long
int32_t main()
{
	double r;
	cin>>r;
	double circum = 2 * M_PI * r;
	cout<<circum<<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

/*▄███████▀▀▀▀▀▀███████▄
░▐████▀▒ЗАПУСКАЕМ▒▀██████▄
░███▀▒▒▒▒▒ДЯДЮ▒▒▒▒▒▒▀█████
░▐██▒▒▒▒▒БОГДАНА▒▒▒▒▒████▌
░▐█▌▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒████▌
░░█▒▄▀▀▀▀▀▄▒▒▄▀▀▀▀▀▄▒▐███▌
░░░▐░░░▄▄░░▌▐░░░▄▄░░▌▐███▌
░▄▀▌░░░▀▀░░▌▐░░░▀▀░░▌▒▀▒█▌
░▌▒▀▄░░░░▄▀▒▒▀▄░░░▄▀▒▒▄▀▒▌
░▀▄▐▒▀▀▀▀▒▒▒▒▒▒▀▀▀▒▒▒▒▒▒█
░░░▀▌▒▄██▄▄▄▄████▄▒▒▒▒█▀
░░░░▄█████████████  █▒▒▐▌
░░░▀███▀▀████▀█████▀▒▌
░░░░░▌▒▒▒▄▒▒▒▄▒▒▒▒▒▒▐
░░░░░▌▒▒▒▒▀▀▀▒▒▒▒▒▒▒▐*/
#include <iostream>
#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <tuple>
#include <math.h>
#include <set>
#include <stack>
#include <bitset>
#include <map>
#include <queue>
#include <random>
#include <unordered_set>
#include <unordered_map>
#define DEBUG
#define fi first
#define se second
#define pqueue priority_queue
#define pb(x) push_back(x)
// #define endl '\n'
#define all(x) x.begin(), x.end()
#define int long long
#define mk(a, b) make_pair(a, b)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef vector<ull> vull;
typedef vector<ll> vll;
// typedef tuple<int, int, int> tiii;
typedef pair<int, int> pii;
typedef vector<pair<int, int> > vpii;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef vector< vector<int> > vvi;
typedef vector<char> vc;

const ll INF = 1e9;
const ll INFLL = 1e18;
const ll MOD = 1000000007;
// const ll MAXN = 3e5;
const ld eps = 1e-6;
const ld eps2 = 1e-9;
const ll MOD2 = 998244353;
const ll dosz = 5e5;
const ll SZ = (1<<18);
const ld PI = atan2l(0, -1);


void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#ifdef DEBUG
        // freopen("a.in", "r",stdin);
#else
       // freopen("input.txt", "r", stdin);
       // freopen("output.txt", "w", stdout);
#endif
}

void solve(){
    ld r;
    cin >> r;
    cout << 2*r*PI << endl;
}

signed main() {
    fast_io();
    int q = 1;
    cout << fixed << setprecision(6);
    // cin >> q;
    while(q--){
        solve();
    }
    return 0;
}
 

Compiler output:
main.c:16:10: fatal error: iostream: No such file or directory
   16 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>

using namespace std;
const double PI = acos(-1);
int main(int argc, char const *argv[])
{
	int r;
	scanf("%d",&r);
	printf("%.6lf\n",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;
    
int main(){
   double n;
   cin>>n;
   cout<<2*3.1415926*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;
    
int main(){
   double n;
   cin>>n;
   cout<<2*3.141592653589793238*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;
    
int main(){
   double n;
   cin>>n;
   cout<<setprecision(15)<<2*3.141592653589793238*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;
    
int main(){
   double n;
   cin>>n;
   cout<<setprecision(25)<<2*3.141592653589793238*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;
    
int main(){
   double n;
   cin>>n;
   cout<<setprecision(50)<<2*3.141592653589793238*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 pb push_back
#define all(v) v.begin(),v.end()
#define mem(arr) memset(arr, 0, sizeof(arr))
#define ff first
#define ss second
#define int long long int
const int MOD = 1e9 + 7;
const int INF = 1e18;
const int N = 1e6 + 20;
vector<int> g[N];
vector<int> vis(N);
int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int tc = 1;
    while(tc--){
        const double pi = 3.14;
        //cout << pi << '\n';
        double r;
        cin >> r; 
        cout << 2 * pi * r << '\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

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

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

#include <bits/stdc++.h>
using namespace std;
int main()
{
	int R ;
	double area ;
	double pie= 3.1416
	cin >> R ;
	area = 2* pie *R ;
	cout << area <<"\n";
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: expected ',' or ';' before 'cin'
    8 |         cin >> R ;
      |         ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
	int R ;
	double area ;
	double pie= 3.1416
	area = 2* pie *R ;
	cout << area <<"\n";
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: expected ',' or ';' before 'area'
    8 |         area = 2* pie *R ;
      |         ^~~~
Language: C

#include <bits/stdc++.h>
#define rep(i,n) for(ll i=0;i<n;i++)
#define rep1(i,n) for(ll i=1;i<=n;i++)
#define repk(i,m,n) for(ll i=m;i<n;i++)
#define IOS ios::sync_with_stdio(false);cin.tie(0);
#define F first
#define S second
#define pb push_back
typedef long long ll;
typedef long double ld;
using namespace std;
const int MOD1=1e9+7;
const int MOD2=998244353;
const int INF=INT_MAX;
const double PI=3.1415926;
int main()
{
    double n;
    cin>>n;
    cout<<fixed<<setprecision(5)<<n*PI*2;
}


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<<setprecision(20)<<fixed<<2*M_PI*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>
#define f first
#define s second
#define MOD 1000000007
#define PMOD 998244353
#define pb(x) push_back(x)
using namespace std;

typedef long long int ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> plii;
typedef pair<int, pii> piii;
const int INF = 1e9+10;
const ll LINF = 1LL*INF*INF;
const int MAXN = 2e5+10;
const int MAXM = 5e3+10;

priority_queue<int> pq;
vector<vector<int> > graph;
queue<int> que;

int A[MAXN];
char S[MAXN];

int main()
{
    int n,m,k,a,b,x,y,q;
    int sum = 0;
    int cnt = 0;
    int mx = 0;
    int mn = INF;
    int cur = 0, idx = -1;
    int tc;

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin>>n;

    double res = (double)n*acos(-1);

    res*=2.0;

    cout<<fixed;
    cout.precision(9);
    cout<<res<<"\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> 
#include<stdio.h>
using namespace std; 

int main() {
  			double pi1 = 3.14159265358979323846;
  			int r;
  			cin >> r;
  			double cir = 2 * pi1 * r;
  			cout  << cir;
}

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<stdio.h>
using namespace std; 

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

  			double pi = 3.14159265358979323846;
  			int r;
  			cin >> r;
  			double cir = 2 * pi * r;
  			cout << fixed << setprecision(4) << cir;
}

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<stdio.h>
using namespace std; 

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


  			int r;
  			cin >> r;
  			double cir = 2 * M_PI * (double) r;
  			cout << fixed << setprecision(10) << cir;
}

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<stdio.h>
using namespace std; 

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

  			int r;
  			cin >> r;
  			double cir = 2 * acos(-1) * (double) r;
  			cout << fixed << setprecision(10) << cir;
}

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;
using ll = long long;
using ld = long double;
using P = pair<ll,ll>;
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define rep2(i,m,n) for(int (i)=(m);(i)<(n);(i)++)
#define ALL(obj) (obj).begin(), (obj).end()
#define rALL(obj) (obj).rbegin(), (obj).rend()
const ll INF = 1LL<<60;
const ll MOD = 1e9+7;



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

  			int r;
  			cin >> r;
  			double cir = 2 * acos(-1) * (double) r;
  			cout << fixed << setprecision(10) << cir;
}

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

-- https://github.com/minoki/my-atcoder-solutions
{-# LANGUAGE TypeApplications #-}

main = do
  r <- readLn @Double
  print $ 2 * pi * r


Compiler output:
main.c:1:1: error: expected identifier or '(' before '--' token
    1 | -- https://github.com/minoki/my-atcoder-solutions
      | ^~
main.c:2:3: error: stray '#' in program
    2 | {-# LANGUAGE TypeApplications #-}
      |   ^
main.c:2:31: error: stray '#' in program
    2 | {-# LANGUAGE TypeApplications #-}
      |                               ^
main.c:4:1: warning: data definition has no type or storage class
    4 | main = do
      | ^~~~
main.c:4:1: error: type defaults to 'int' in declaration of 'main' [-Wimplicit-int]
main.c:4:8: error: expected expression before 'do'
    4 | main = do
      |        ^~
main.c:5:15: error: stray '@' in program
    5 |   r <- readLn @Double
      |               ^
Language: C

/*   ꧁༒☬महाकाल☬༒꧂ ꧁༒ঔमहाकालঔ༒꧂
                   
                   ঔৣ۝महाकालᴳᵒᵈ۝ঔৣ            
 
 */ 
#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;
//template <typename T, typename cmp=less<T>> using oset =tree<T, null_type, cmp, rb_tree_tag, tree_order_statistics_node_update>;
#define ll long double 
#define mod 1000000007
#define inf 100000000000000000
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define _it iterator
#define all(_x) _x.begin(),_x.end()
#define f first
#define s second
#define pb push_back
void mahakal(){
	#ifndef ONLINE_JUDGE
	freopen("input.txt","r",stdin);
	freopen("output.txt","w",stdout);
	freopen("error.txt","w",stderr);
	#endif
}
ll pi=3.141;
int main(){
	//mahakal(),fast;
	
	ll n ;
	cin>> n ;
	ll ans = 2*pi * n ;
	cout<<ans<<endl;

	return 0;
}

Compiler output:
main.c:6:9: fatal error: bits/stdc++.h: No such file or directory
    6 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

int main() {
  int R;
  cin >> R;
  cout << 2*3.14159265*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;
using vi = vector<int>;
using vii = vector<vi>;
using vs = vector<string>;
using in6 = int64_t;
using ind = double;
using pii = pair<int,int>;
using psi = pair<string,int>;
using vpi = vector<pii>;
using vps = vector<psi>;
#define rep(i, n) for (in6 i = 0; i < (in6)(n); i++)
#define repa(i,a,n) for(in6 i = a; i < (in6)(n); i++)
#define repdown(i,n) for(in6 i = n; i > 0; i--)
#define kyun ios::sync_with_stdio(false)
#define hinata cout << "\n"
#define all(c) (c).begin(), (c).end()
#define pb push_back
#define inf 2147483647
#define dset(n) cout << fixed << setprecision(n)

void yes() {
  cout << "Yes";
}

void no() {
  cout << "No";
}

int main() {
  kyun;
  int a;
  cin >> a;
  const double pi = acos(-1.0);
  cout << 2*a*pi;
  hinata;
}

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*3.141592650;
}


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 <bitset>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <fstream>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <typeinfo>
#include <unordered_map>
#include <unordered_set>
#include <vector>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vpii;

void solve() {
	int r;
	static const double PI = acos(-1);
	cin >> r;
	cout << 2 * PI * r << "\n";
}

int main(int argc, char *argv[]) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int o_o = 1;
  if (!o_o)
    cin >> o_o;
  for (; o_o; --o_o)
    solve();
  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 R;
    cin >> R;
    cout << 2.0*R*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 <bits/stdc++.h>
using namespace std;
 
int main() {
  int R;
  cin >> R;
  cout << R*3.141592650;
}

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 r;
  cin >> r;
  cout << 2 * acos(-1) * r << "\n";
  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

//inlclude前用define 
#define _USE_MATH_DEFINES

//include
#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<cmath>
#include<type_traits>
#include<numeric>
//#include<deque>
#include<iomanip>
#include<set>
#include<tuple>
#include<map>
#include<limits>

using namespace std;

//typedef
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<char> VC;
typedef long long int ll;

//define
#define INF 1e9 
#define NUM 1000000007
#define all(x) begin(x), end(x)
#define rep(i,n) for(int i=0;i<(int)(n);i++)

int main(){
  int r;
  cin>>r;
  cout<<fixed;
  cout<<2*r*M_PI<<endl;

}


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

#include<iostream>
using namespace std;
#define pi	3.1415926
int main()
{
  int r;
  scanf("%d", &r);
  printf("%f\n", 2*pi*r);
  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>
typedef long long ll;
using namespace std;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	double n;
	cin>>n;
	cout<<fixed << setprecision(15)<<n*2*3.141592653589793<<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<math.h>
#include<iomanip>

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

	double pi = acos(-1.0);

	double ans = 2.0 * R * pi;
	std::cout << std::setprecision(20) << std::fixed << ans << std::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<iostream>
#include<math.h>
#include<iomanip>

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

	const double pi = acos(-1.0);

	double ans = 2.0 * R * pi;
	std::cout << std::setprecision(20) << std::fixed << ans << std::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<iostream>
#include<math.h>
#include<iomanip>

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

	const double pi = acos(-1.0);

	double ans = 2.0 * R * pi;
	std::cout << std::setprecision(20) << std::fixed << ans << std::endl;
	return 0;//()桁数
}

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

import java.util.*;
class A163{
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int r=sc.nextInt();
        double pi = 3.141592653589793238;
        double cirf=2*pi*r;
        System.out.println(cirf);

    }
}

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.*;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.*;
      |            ^
main.c:2:1: error: unknown type name 'class'
    2 | class A163{
      | ^~~~~
main.c:2:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    2 | class A163{
      |           ^
Language: C

#include<bits/stdc++.h>
#define lint long long int
using namespace std;
int main() 
{
	lint r=0;
	cin>>r;
	cout<<r*3.141592<<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<iostream>
#include<math.h>
 
int main(){
  double n;
  cin >> n;
  cout << M_PI*2*n;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> n;
      |   ^~~
      |   std::cin
In file included 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:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout << M_PI*2*n;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

using System;
using System.Collections.Generic;

class MainClass
{
   
    public static void Main(string[] args)
    {
        Console.WriteLine( (float)LnInt() * 2 * Math.PI);

    }

   
    public static int[] LnInts()
    {
        var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        var ins = new int[vs.Length];
        for (int i = 0; i < vs.Length; i++) ins[i] = int.Parse(vs[i]);
        return ins;
    }

    public static int LnInt()
    {
        var vs = Console.ReadLine().Trim();
        return int.Parse(vs);
    }

    public static string[] LnStrs()
    {
        var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        return vs;
    }
    public static string LnStr()
    {
        var vs = Console.ReadLine().Trim();
        return vs;
    }
}

Compiler output:
main.c:1:1: error: unknown type name 'using'
    1 | using System;
      | ^~~~~
main.c:2:1: error: unknown type name 'using'
    2 | using System.Collections.Generic;
      | ^~~~~
main.c:2:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | using System.Collections.Generic;
      |             ^
main.c:4:1: error: unknown type name 'class'
    4 | class MainClass
      | ^~~~~
main.c:5:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    5 | {
      | ^
Language: C

using System;
using System.Collections.Generic;

class MainClass
{
   
    public static void Main(string[] args)
    {
        Console.WriteLine( LnInt() * 2 * Math.PI);

    }

   
    public static int[] LnInts()
    {
        var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        var ins = new int[vs.Length];
        for (int i = 0; i < vs.Length; i++) ins[i] = int.Parse(vs[i]);
        return ins;
    }

    public static int LnInt()
    {
        var vs = Console.ReadLine().Trim();
        return int.Parse(vs);
    }

    public static string[] LnStrs()
    {
        var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        return vs;
    }
    public static string LnStr()
    {
        var vs = Console.ReadLine().Trim();
        return vs;
    }
}

Compiler output:
main.c:1:1: error: unknown type name 'using'
    1 | using System;
      | ^~~~~
main.c:2:1: error: unknown type name 'using'
    2 | using System.Collections.Generic;
      | ^~~~~
main.c:2:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | using System.Collections.Generic;
      |             ^
main.c:4:1: error: unknown type name 'class'
    4 | class MainClass
      | ^~~~~
main.c:5:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    5 | {
      | ^
Language: C

main = do
    r <- readLn
    print $ pi*(r^2)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | main = do
      | ^~~~
main.c:1:1: error: type defaults to 'int' in declaration of 'main' [-Wimplicit-int]
main.c:1:8: error: expected expression before 'do'
    1 | main = do
      |        ^~
Language: C


/*
██████╗  ███████╗  
██╔══██╗ ██╔════╝ 
██████╔╝ ███████╗ 
██╔══██╗ ╚════██║  
██║  ██║ ███████║      
╚═╝  ╚═╝ ╚══════╝                                                                                                             
*/

#include<bits/stdc++.h>
using namespace std;
 
#define ll long long int
#define rep(i,n) for(int i=0;i<n;i++)
#define rev(i,n) for(int i=n-1;i>=0;i--)
#define haha(j,a,n) for(int j=a;j<n;j++)
#define Max(x,y,z) max(x,max(y,z))
#define Min(x,y,z) min(x,min(y,z))
#define endl "\n"
#define bc(v) v.begin(),v.end()
#define vl vector<ll>
#define vi vector<int>
#define why 1000000007
#define NUM 100005
#define F first
#define S second
#define bhar(a) rep(i,a.size()) cin>>a[i];
#define show(a) rep(i,a.size()) cout<<a[i]<<" ";
#define sott(a) sort(bc(a))
#define mp(a,b) make_pair(a,b)
#define pb push_back
#define mapp map<ll,ll>
#define dkac cout<<fixed<<setprecision(15);
#define ios ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define yeah(n) while(n--)
#define pi 3.1415926535897
ll gcd(int a, int b){if(b==0) return a; else return gcd(b,a%b);}
ll bitfun(ll x){
  return (x&(-x));
}
void solve(){
  dkac
  ll r; cin>>r;
  cout<<2*pi*r;
}
int main(){
    ios
    int t=1; 
    //cin>>t;
    yeah(t){
      solve();
    }
}

Compiler output:
main.c:11:9: fatal error: bits/stdc++.h: No such file or directory
   11 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

int main()
{
  double R;
  cin>>R;
  cout << 2.0 * R * M_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<stdio.h>

int main(void)
{
  int R;
  scanf("%d",&R);
  int x;
  x = 2 * r * 3.14;
  printf("%d",x);
  
  return 0;
} 

Compiler output:
main.c: In function 'main':
main.c:8:11: error: 'r' undeclared (first use in this function)
    8 |   x = 2 * r * 3.14;
      |           ^
main.c:8:11: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define int long long
#define endl '\n'
#define pb push_back
#define fi first
#define se second
#define all(c) (c).begin(),(c).end()
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef vector<int> vi;

template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define TRACE
#ifndef ONLINE_JUDGE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
	cerr << name << " : " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
	const char* comma = strchr(names + 1, ',');cerr.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
}
#else
#define trace(...)
#endif

const ll inf = 2e18;
const int mod = 1e9 + 7;
const int N = 2e5 + 10;

signed main() {
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

	ld r;
	cin >> r;
	cout << fixed << setprecision(10) << 2.0 * acos(-1) * 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<iostream>

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin>>r;
      |   ^~~
      |   std::cin
In file included 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:8:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   cout<<ans;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#includ<iostream>

int main()
{
	int r ;
  	cin>>r ;
  
  float ans = 2 * 3.14 * r ;
  
  cout<<ans ;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #includ; did you mean #include?
    1 | #includ<iostream>
      |  ^~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |         cin>>r ;
      |         ^~~
a.cc:10:3: error: 'cout' was not declared in this scope
   10 |   cout<<ans ;
      |   ^~~~
Language: C

#include<stdio.h>

int main(void)
{
  int r,x;
  scanf("%d",&r);
  x = r * 2　* 3.14;
  printf("&x",/n);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:12: error: stray '\343' in program
    7 |   x = r * 2<U+3000>* 3.14;
      |            ^~~~~~~~
main.c:8:15: error: expected expression before '/' token
    8 |   printf("&x",/n);
      |               ^
Language: C++

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<unordered_map>
#include<map>
#include<climits>
using namespace std;
using ll = long long;
int main() {
	int a;
	cin >> a;
	cout << 2 * acos(-1) * a;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:21: error: 'acos' was not declared in this scope
   13 |         cout << 2 * acos(-1) * a;
      |                     ^~~~
Language: C

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

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin>>n;
    float c=2*M_PI*n;
    printf("%.2f",c);
    
}



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 <vector>
#include <string>
#include <map>
#include <cmath>

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

constexpr ll LLINF {1001002003004005006};//ll = 9*LLINF
constexpr int INTINF {1000000000};//int = 2*INTINF

#define  rep(i,n)   for(int i = 0; i < (n); ++i)
#define rrep(i,n)   for(int i = 1; i <= (n); ++i)
#define drep(i,n)   for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for(int i = s; i < t;  ++i)

template<typename T>
void maxs(T& x, T&& y) {
  x=std::max(x,y);
}
template<typename T>
void maxs(T& x, T& y) {
  x=std::max(x,y);
}

template<typename T>
void mins(T& x, T&& y) {
  x=std::min(x,y);
}
template<typename T>
void mins(T& x, T& y) {
  x=std::min(x,y);
}

int main() {
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  int A;
  cin >> A;
  cout << (3.14159265*A*2) << '\n';
}


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

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

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin>>n;
    float c=2*M_PI*n;
    printf("%.2f",c);
    
}



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

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

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin>>n;
    float c=2*M_PI*n;
    printf("%.2f",c);
    
}



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{
  
 double t = 6.28318530717958623200;
 int r;
 cin >> r;
 cout << fixed << r*t << endl;
  
}


Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main{
      |     ^~~~
a.cc:6:2: error: expected primary-expression before 'double'
    6 |  double t = 6.28318530717958623200;
      |  ^~~~~~
a.cc:6:2: error: expected '}' before 'double'
a.cc:4:9: note: to match this '{'
    4 | int main{
      |         ^
a.cc:8:2: error: 'cin' does not name a type
    8 |  cin >> r;
      |  ^~~
a.cc:9:2: error: 'cout' does not name a type
    9 |  cout << fixed << r*t << endl;
      |  ^~~~
a.cc:11:1: error: expected declaration before '}' token
   11 | }
      | ^
Language: C++

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

int main{
  
 double t = 6.28318530717958623200;
 cin >> r;
 cout << fixed << r*t << endl;
  
}

Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main{
      |     ^~~~
a.cc:6:2: error: expected primary-expression before 'double'
    6 |  double t = 6.28318530717958623200;
      |  ^~~~~~
a.cc:6:2: error: expected '}' before 'double'
a.cc:4:9: note: to match this '{'
    4 | int main{
      |         ^
a.cc:7:2: error: 'cin' does not name a type
    7 |  cin >> r;
      |  ^~~
a.cc:8:2: error: 'cout' does not name a type
    8 |  cout << fixed << r*t << endl;
      |  ^~~~
a.cc:10:1: error: expected declaration before '}' token
   10 | }
      | ^
Language: C

R = float(input())
print(2*3.14*R)

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

#include<cmath>
#include<bits.stdc++.h>
using namespace std;
int main(){
  int r;
  cin >> r;
  cout << 2*M_PI*r << "\n";
}

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

#include<cmath>

int r;
cin >> r;
cout<<2*r*M_PI<<"\n";


Compiler output:
a.cc:4:1: error: 'cin' does not name a type
    4 | cin >> r;
      | ^~~
a.cc:5:1: error: 'cout' does not name a type
    5 | cout<<2*r*M_PI<<"\n";
      | ^~~~
Language: C++

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

int main() {
  int r;
  cin >> r;
  cout << r * 2 *　M_PI << endl;
}

Compiler output:
a.cc:7:18: error: extended character 　 is not valid in an identifier
    7 |   cout << r * 2 *　M_PI << endl;
      |                  ^
a.cc: In function 'int main()':
a.cc:7:18: error: '\U00003000M_PI' was not declared in this scope; did you mean 'M_PI'?
    7 |   cout << r * 2 *　M_PI << endl;
      |                  ^~~~~~
      |                  M_PI
Language: C

#include <bits/stdc++.h> 
using namespace std;
const int MOD = 1000000007;
int main() 
{ 
  
   // print circumferences of a circle of R radius. formula C = 2 * pi * r;
    int r;
    cin >> r;
    float pi = 3.14159265359;
    float ans = (float)(2*pi*r);
     printf("%0.20f", ans);

    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 *　M_PI << endl;
}


Compiler output:
a.cc:7:18: error: extended character 　 is not valid in an identifier
    7 |   cout << R * 2 *　M_PI << endl;
      |                  ^
a.cc: In function 'int main()':
a.cc:7:18: error: '\U00003000M_PI' was not declared in this scope; did you mean 'M_PI'?
    7 |   cout << R * 2 *　M_PI << endl;
      |                  ^~~~~~
      |                  M_PI
Language: C

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
typedef long long ll;
#define _GLIBCXX_DEBUG
typedef vector<int> vec;
typedef vector<ll> lvec;
typedef vector<char>cvec;
typedef pair<ll, ll> LP;
typedef tuple<ll, ll, ll> LT;
typedef pair<int, int> P;
typedef tuple<int, int, int> T;
int main()	{
  int r;
  cin>>r;
  double ans=3.141*4*r;
  cout<<fixed<<setprecision(5)<<ans<<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;

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


Compiler output:
a.cc:8:18: error: extended character 　 is not valid in an identifier
    8 |   cout << R * 2 *　PI << endl;
      |                  ^
a.cc: In function 'int main()':
a.cc:8:18: error: '\U00003000PI' was not declared in this scope
    8 |   cout << R * 2 *　PI << endl;
      |                  ^~~~
Language: C

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

int main()
{
	int a;
	cin >> a;
	cout << a*2*3.14 << 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() {
  int R;
  const double PI=3.14159265358979323846;
  cin >> R;
  cout << R * 2 *　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;

int main() {
  int R;
  const double PI = acos(-1);
  cin >> R;
  cout << R * 2 *　PI << endl;
}


Compiler output:
a.cc:8:18: error: extended character 　 is not valid in an identifier
    8 |   cout << R * 2 *　PI << endl;
      |                  ^
a.cc: In function 'int main()':
a.cc:8:18: error: '\U00003000PI' was not declared in this scope
    8 |   cout << R * 2 *　PI << endl;
      |                  ^~~~
Language: C

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

#define ll long long
#define mod 1000000007

int main() {

	int r;
	cin >> r;
	cout << setprecision(14) << 2.0 * 3.141592653589793238 * (double)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 <iostream>
#include <iomanip>
#include <unordered_map>
#include <set>
#include <fstream>
#include <cstring>
#include <climits>
#include <algorithm>
#include <math.h>
#include <vector>
using namespace std;

#define ll long long
#define mod 1000000007

int main() {

	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif

	int r;
	cin >> r;
	cout << setprecision(14) << 2.0 * 3.141592653589793238 * (double)r;

	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>
#include <unordered_map>
#include <set>
#include <fstream>
#include <cstring>
#include <climits>
#include <algorithm>
#include <math.h>
#include <vector>
using namespace std;

#define ll long long
#define mod 1000000007

int main() {

	double r;
	cin >> r;
	cout << 2.0000 * 3.141592653589793238 * r;

	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>
#include <unordered_map>
#include <set>
#include <fstream>
#include <cstring>
#include <climits>
#include <algorithm>
#include <math.h>
#include <vector>
using namespace std;

#define ll long long
#define mod 1000000007

int main() {

	double r;
	cin >> r;
	cout << setprecision(14) << 2.0 * 3.141592653589793238 * r;

	return 0;
}

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