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

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

typedef long long ll;
#define optimize() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define file() freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
#define tt int t; cin>>t; while(t--)
#define nl cout<<"\n";
#define sp cout<<" ";
#define rep(i, a, b) for(long long i=a; i<b; i++)


int main()
{
    optimize();
    long double r, c;
    cin>> r;
    cout<< fixed<< setprecision(20);
    cout<< 2*r*3.1416;
    nl;


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

int main()[
int R;
double L;

scanf("%d", &R);

L=2.0*M_PI*R;

printf("%lf", L);
return 0;
]

Compiler output:
main.c:5:1: error: expected expression before 'int'
    5 | int R;
      | ^~~
Language: C

#include <iostream>
#include<bits/stdc++.h>

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

const long long INF = 1LL << 60;

typedef long long ll;

template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

int main(){
    int r;
    double pi =  3.14159265;
    cin >> r;
    cout << setprecision(20) <<  double(2 *pi *  r )<< endl;
    return 0;
}


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

int r
scanf("%d",&r);
int ans = 2*r*3.14 ;
printf("%d",ans);

Compiler output:
main.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'scanf'
    2 | scanf("%d",&r);
      | ^~~~~
main.c:3:13: error: 'r' undeclared here (not in a function)
    3 | int ans = 2*r*3.14 ;
      |             ^
main.c:4:8: error: expected declaration specifiers or '...' before string constant
    4 | printf("%d",ans);
      |        ^~~~
main.c:4:13: error: expected declaration specifiers or '...' before 'ans'
    4 | printf("%d",ans);
      |             ^~~
Language: C

#include <iostream>
#include <iomanip>
#include <vector>
#include <map>
#include <unordered_map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <math.h>
#include <sstream>
#include <numeric>
#include <string>
#include <cassert>
#include <bitset>

using namespace std;
typedef long long ll;

int main() {
  int R;
  cin >> R;
  cout << 2.0 * 3.14159265 * R << endl;
  return 0;
}


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

R = int(input())

print(R*3.1414*2)

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

import math
R = int(input())
print(R*2*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 'R'
    2 | R = int(input())
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define PI (acos(-1))
#define ct cout<<
#define cn cin>>
#define spc <<" "<<
#define nl puts("")
#define _fl(x) puts("FLAG " #x);
#define  _(x)  cout<< #x <<" is "<< x <<endl;
#define fs first
#define sc second
#define pb push_back
#define all(v)  (v).begin(), (v).end()
#define _109 (1000000000)
#define _0(arr) memset(arr,0,sizeof ( arr ) )
#define _1(arr) memset(arr,-1,sizeof ( arr ) )
#define _ninp(n,arr) for(int i=0; i<n;i++)cin>>arr[i];
#define _nout(n,arr) for(int i=0; i<n;i++)cout<<arr[i]<<" \n"[i==n-1];
double _eps=1e-6;


int main() {

    int n, m, l;
    


    cn n;
    printf("%.3lf",2*PI*n);nl



    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:35:5: error: expected ';' before 'return'
   35 |     return 0;
      |     ^~~~~~
Language: C++

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

double main()
{
    double R;
    cin >> R;
    cout << 2 * R * 3.1415926535897932384626 << endl;
}

Compiler output:
a.cc:4:1: error: '::main' must return 'int'
    4 | double main()
      | ^~~~~~
Language: C

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

import java.util.*;
public class Solution {
public static void main(String []args) {
	Scanner sc = new Scanner (System.in);
	int r= sc.nextInt();
	double res=2*Math.PI*r;
	System.out.println(res);
}
}


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

package main

import (
	"fmt"
	"math"
)

func main() {
	var r float64
	fmt.Scan(&r)
	fmt.Println(2 * math.Pi * r)
}


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

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

int main(){
    int r ;
    cin >> r ;
    cout << r*2.0*M_PI << endl ;
}

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

#include<bits/stdc++.h>
using namespace std;
 
int main() {
  
  int R;
  cin>>R;
  
  
  
  cout<<R*2*M_PI<<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()
{
    double pi=3.1415926535897932384626;
    double r;
    cin>>r;
    printf("%.20f\n",r*pi*2);
    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<cstdio>
#include<string>
#include<vector>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<queue>
#include<stack>
#include<set>
#include<map>
#define ll long long
#define PI acos(-1.0)
#define MAX 0x3fffffff
using namespace std;

double r;

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin >> r;
	printf("%.8lf\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>
//#define pi acos(-1)
using namespace std;
int main()
{
    //cout<<"bismillahhir rahmanir rahim"<<endl;
    double r, pi = acos(-1);
    cin>>r;
    cout<<2*pi*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<iostream> 
#include<math>
using namespace std;
float area ( float a )
{
  return M_PI * a * a;
}
int main()
{
  float r;
  cin>>r;
  cout<<area(r)<<endl;
}

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

#include<stdio.h>
#include<matlib.h>
int main()
{
  int r;
  printf("Enter the radius of circle:");
  scanf("%d",&r);
  printf("/n Circumference=%d",2*pi*r);
  return 0;
}

Compiler output:
main.c:2:9: fatal error: matlib.h: No such file or directory
    2 | #include<matlib.h>
      |         ^~~~~~~~~~
compilation terminated.
Language: Java

import java.util.*;

public class main {
	public static void main(String[] args){

		Scanner scan01 = new Scanner(System.in);
		int num = scan01.nextInt();
		scan01.close();

		int mult = num*2;

		double circle= mult * 3.14;

		System.out.println(circle);
	}
}


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

#include <bits/stdc++.h>

using namespace std;

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

	long double r;
	cin >> r;
	cout << fixed << setprecision(10) << 4*r*asin(1) << '\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>
using namespace std;
int main()
{
	int r;
	cin>>r;
	double p=3.14159265358979323846;
	printf("%.20f",2*p*r);
	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

/*input
73
*/

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 

#define rep(i,j,n) for(i=j;i<n;i++)
#define repi(i,j,n) for(i=j;i>n;i--)
#define inf 100001
#define M 1000000007
#define ll long long
#define ld long double
#define vll vector<long long>
#define vi vector<int>
#define pll pair<long long,long long>
#define pii pair<int,int>
#define vpii vector<pair<int,int> >
#define vpll vector<pair<long long,long long> >
#define pb push_back
#define pf pop_front
#define F first
#define S second
#define endl '\n'

using namespace std;
using namespace __gnu_pbds; 

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


ll power(ll a,ll m,ll mod){
	ll ans=1;
	while(m){
		if(m%2){
			ans*=a;
			ans%=(mod);
		}
		a=(a*a)%(mod);
		m>>=1;
	}
	return ans;
}


void init(ll* a,ll n,ll val){
	for(ll i=0;i<n;i++)
		a[i]=val;
}



int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);	
	ll t=1,i,j;
	ll n;
	cin>>n;
	cout<<setprecision(10)<<n*2.0*3.141592653589793<<endl;
	return 0;
}




Compiler output:
main.c:5:10: fatal error: bits/stdc++.h: No such file or directory
    5 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

///mAAria...
#include<bits/stdc++.h>
 
using namespace std;
 
#define int long long

const long double PI = acos(-1);

const int maxn = 2*1e5 + 10;


void solve(){
    int r;
    cin >> r;

    double ans = 2.0*PI*(double)r;

    cout << fixed << setprecision(12) << ans << endl;
    

} 

signed main() 
{   
    IOS;
    int t = 1;
    // cin >> t;

    for(int i = 1;i<=t;i++){
        solve();
    }
    return 0;
} 

 


Compiler output:
a.cc: In function 'int main()':
a.cc:26:5: error: 'IOS' was not declared in this scope
   26 |     IOS;
      |     ^~~
Language: C++

#define _USE_MATH_DEFINES
#include <iostream>
#include <cmath>

inline double circleArea( double radius ) {
    return 2 * radius * M_PI;
}

int main( void ) {
  double R;
  
  cin >> R;
    std::cout << circleArea( R ) << std::endl;
    return EXIT_SUCCESS;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   12 |   cin >> R;
      |   ^~~
      |   std::cin
In file included from a.cc:2:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
Language: C

function Main(inpu){
	let input = input
}

console.log(input * 3.14);

Main(require("fs").readFileSync("/dev/stdin", "utf8"));

Compiler output:
main.c:1:1: error: unknown type name 'function'; did you mean 'union'?
    1 | function Main(inpu){
      | ^~~~~~~~
      | union
main.c: In function 'Main':
main.c:1:10: error: type of 'inpu' defaults to 'int' [-Wimplicit-int]
    1 | function Main(inpu){
      |          ^~~~
main.c:2:9: error: unknown type name 'let'
    2 |         let input = input
      |         ^~~
main.c:3:1: error: expected ',' or ';' before '}' token
    3 | }
      | ^
main.c:5:1: error: 'console' undeclared (first use in this function)
    5 | console.log(input * 3.14);
      | ^~~~~~~
main.c:5:1: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:6: error: implicit declaration of function 'require' [-Wimplicit-function-declaration]
    7 | Main(require("fs").readFileSync("/dev/stdin", "utf8"));
      |      ^~~~~~~
main.c:7:19: error: request for member 'readFileSync' in something not a structure or union
    7 | Main(require("fs").readFileSync("/dev/stdin", "utf8"));
      |                   ^
main.c:7:1: error: expected declaration or statement at end of input
    7 | Main(require("fs").readFileSync("/dev/stdin", "utf8"));
      | ^~~~
Language: C

#include<bits/stdc++.h>
using namespace std;
#define pi 3.14159265358979323
int main(){
	float n;
	cin>>n;
	cout << fixed << setprecision(20) << 2*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>
#include<algorithm>
#include<cmath>

using namespace std;
typedef long long ll;
const ll limit = 1e6+2;
long long a[limit];
long long n,m,d,temp,op;
float tp,t,mp=2;

int main()
{
    cin>>t;t*=2;
    tp=6.28318530717958623200/mp*t;
    printf("%0.20f",tp);
}


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

#include <iostream>
#include <iomanip>
using namespace std;
const double pi = 3.141592653589;

int main() 
{
	double data;
	cin >> data;
	long double ans = (double)(data + data) * pi;
	cout << std::fixed << std::setprecision(15);
	cout << ans << endl;

	return 0;
}

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

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

int main() {
  double n;
  cin >> n;
  n = n * 2.0 * M_PI;
  cout << n << 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(){
  double a;
  cin >> a;
  cout << a*2*M_PI << endl
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:27: error: expected ';' before '}' token
    6 |   cout << a*2*M_PI << endl
      |                           ^
      |                           ;
    7 | }
      | ~
Language: C

#include <iostream>
using namespace std;
double p=3.1415926535;

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

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

import java.awt.*;
import java.util.*;
import java.io.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        FastReader sc = new FastReader();
//        double r=sc.nextInt();
        ArrayList<Double> arr=new ArrayList<>();
        System.out.println((float) (2D*(3.14159265358979D)*(sc.nextDouble())));
    }
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}


Compiler output:
Main.java:5: error: class Solution is public, should be declared in a file named Solution.java
public class Solution {
       ^
1 error
Language: C

#include<bits/stdc++.h>
using namespace std;
#define Endl '\n'
typedef long long int lli;
/*
created on: 19/4/2020
*/
void solve();
int main(int argc, char const *argv[]){
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  solve();
}
void solve(){
  double R;
  cin>>R;
  double pie = 6.28318530717958623200/2;
  printf("%.8f\n", 2*pie*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

scanf("%d",&r);
int ans = 2*r*3.14 ;
printf("%d",ans);

Compiler output:
main.c:1:7: error: expected declaration specifiers or '...' before string constant
    1 | scanf("%d",&r);
      |       ^~~~
main.c:1:12: error: expected declaration specifiers or '...' before '&' token
    1 | scanf("%d",&r);
      |            ^
main.c:2:13: error: 'r' undeclared here (not in a function)
    2 | int ans = 2*r*3.14 ;
      |             ^
main.c:3:8: error: expected declaration specifiers or '...' before string constant
    3 | printf("%d",ans);
      |        ^~~~
main.c:3:13: error: expected declaration specifiers or '...' before 'ans'
    3 | printf("%d",ans);
      |             ^~~
Language: C

    
#include <bits/stdc++.h>

#define rep(i,m,n) for(int i=m;i<n;i++)
#define pb push_back
#define ll long long 
#define out(n) cout<<#n<<' = '<<'\n'

using namespace std;

int main()
{
    
    cout<<fixed<<setprecision(15);
    int r;
    cin>>r;
    double a=2*r*(3.14);
    cout<<a;
    return 0;
}

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

#include <bits/stdc++.h>

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

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 << M_PI * R * 2 << endl;
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:33: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    6 |         cout << M_PI * R * 2 << endl;
      |                                 ^~~~
      |                                 std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C

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

int main() {
  int r;cin>>r;
  cout << M_PI * r * r << 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;
typedef long long ll;
const int maxn = 2e5+100;
int main(){
    double P = acos(-1.0);
    double r;
    cin>>r;
    printf("%.10f\n",P*r*2);
    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 a;
    float c;
    cin>>a;
    c=2*a*3.1415926535;
    cout<<c*1.0;
}

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

#include <A-Circle Pond>
using namespace std;

int main (){
  int R;
  cin>>R;
  cout<<R*6.2830<<endl;
}


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

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
typedef long long int ll;
 
int main(){
  double R;
  cin>>R;
  double ans;
  ans=2*3.1415*R;
 cout<<setprecision(6)<<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

import math
A = int(input())

print(2 * A * 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 'A'
    2 | A = int(input())
      | ^
Language: C

//#pragma GCC optimize ("O3")
//#pragma GCC target ("avx")
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please


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


	double pi = acos(-1);
	int R;
	cin >> R;


	cout << setprecision(12) << pi * R * 2 << endl;



	Would you please return 0;
}

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

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

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



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

#include <algorithm>
#include <array>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <vector>
using namespace std;
#define int long long

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

    cout << fixed << setprecision(16);

    int r;
    cin >> r;

    cout << 2 * M_PI * r << endl;
}


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 facctorialMethod(int k){
//     int sum = 1;
//     for (int i = 1; i <= k; ++i)
//     {
//         sum *= i;
//     }
//     return sum;
// }
int main(){
    double N;
    cin >> N;
    // vector<string> vec(N);
    // for(int i=0;i<N;i++){
    //     cin >> vec.at(i);
    // }
    // vector<int> c(N);
    // sort(vec.begin(),vec.end());
    // string tmp = vec.at(0);
    // for(int i=1;i<N;i++){
    //     if(vec.at(i)==tmp){
    //         tmp = vec.at(i)
    //         c(i)
    //     }
    // }
    cout << 2.0*N*3.141592 << endl;
}

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

#include<bits/stdc++.h>
using namespace std;
# define M_PI  3.14159265358979323846

int main()
{
	int r;
	cin >> r;
  	cout << fixed << setprecision(20) << 2 * M_PI * 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

int L;
int R;
scanf R;
L = 6*R;
printf R;

Compiler output:
main.c:3:1: error: unknown type name 'scanf'
    3 | scanf R;
      | ^~~~~
main.c:4:1: warning: data definition has no type or storage class
    4 | L = 6*R;
      | ^
main.c:4:1: error: type defaults to 'int' in declaration of 'L' [-Wimplicit-int]
main.c:4:5: error: initializer element is not constant
    4 | L = 6*R;
      |     ^
main.c:5:1: error: unknown type name 'printf'
    5 | printf R;
      | ^~~~~~
main.c:1:1: note: 'printf' is defined in header '<stdio.h>'; this is probably fixable by adding '#include <stdio.h>'
  +++ |+#include <stdio.h>
    1 | int L;
Language: C

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

#define lli long long int
#define pb push_back
#define in insert
#define pi pair<int, int>
#define pd pair<double, int>
#define pii pair<int, pi>
#define mp make_pair
#define fir first
#define sec second
#define MAXN 200001
#define mod 1000000000

signed main()
{
  lli n;
  cin >> n;
  float ans = 2 * 3.1415 * n;
  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 <bits/stdc++.h>
using namespace std;

int main()
{
	int r;
	double l;

	cin >> r;
	l=2*r*3.14159265358979;
	cout << l << endl;



}



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

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

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

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,x) for(int i=1;i<=x;i++)
#define put(ans)    cout << ans << endl;
#define sort(s) sort(s.begin(),s.end())
#define reverse(s) reverse(s.begin(),s.end())

//最大公約数
ll gcd(ll a, ll b) {
    return b ? gcd(b, a%b) : a;
}
//最小公倍数
ll lcm(ll a, ll b) {
    return a / gcd(a, b) * b;
}

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

    cout << 2*M_PI*r << 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 {
  
  int N;
  cin >> N;
  cout << N * 3.14 << endl;
}


Compiler output:
a.cc:5:5: error: cannot declare '::main' to be a global variable
    5 | int main {
      |     ^~~~
a.cc:7:3: error: expected primary-expression before 'int'
    7 |   int N;
      |   ^~~
a.cc:7:3: error: expected '}' before 'int'
a.cc:5:10: note: to match this '{'
    5 | int main {
      |          ^
a.cc:8:3: error: 'cin' does not name a type
    8 |   cin >> N;
      |   ^~~
a.cc:9:3: error: 'cout' does not name a type
    9 |   cout << N * 3.14 << endl;
      |   ^~~~
a.cc:10:1: error: expected declaration before '}' token
   10 | }
      | ^
Language: C

#include<bits/stdc++.h>
using namespace std;
int main(void)
{
	const double pi=atan(1.)*4.;
	int r;
	cin>>r;
	cout<<r*2*pi<<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>
#define rep(i, n) for (int i=0; i<n; ++i)
#define rep1(i, n) for (int i=1; i<=n; ++i)
#define ALL(v) v.begin(), v.end()
#define RALL(v) v.rbegin(), v.rend()
#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
constexpr ll  MOD = (1e9+7);
constexpr int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }
constexpr int lcm(int a, int b) { return a / gcd(a, b) * b; }

template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
ll factorial(ll n, ll m=2) {
    // calculate n!
    m = max(2LL, m);
    ll rtn = 1;
    for (ll i=m; i<=n; i++) {
        rtn = (rtn * i) % MOD;
    }
    return rtn;
}
ll modinv(ll a, ll m) {
    ll b = m, u = 1, v = 0;
    while (b) {
        ll t = a / b;
        a -= t * b;
        swap(a, b);
        u -= t * v;
        swap(u, v);
    }
    u %= m;
    if (u < 0) u += m;
    return u;
}
ll modpow(ll a, ll n) {
    ll res = 1;
    while (n > 0) {
        if (n & 1)
            res = res * a % MOD;
        a = a * a % MOD;
        n >>= 1;
    }
    return res;
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    double r; cin >> r;
    double pi = 3.141592653589793238;
    cout << setprecision(30)<< pi * r * 2 << 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

/*
ID: wangyuxi20040901
TASK:  ()
LANG: C++
DATE: 20200419 19:22:44
*///using CRLF, UTF-8

#include <cstdio>
#include <algorithm>
#include <cstring>
#define pr printf
#define F(i, j, k) for(register int i = j, kkllkl = k; i <= kkllkl; ++i)
#define G(i, j, k) for(register int i = j, kkllkl = k; i >= kkllkl; --i)
#define clr(a, v) memset((a), v, sizeof(a))
using namespace std;
typedef long long ll;

#define isd(x) (('0' <= (x) && (x) <= '9') || (x) == '-')
int rd() {
    int ans = 0, sign = 1; char c = getchar();
    while(!isd(c)) c = getchar();
    if(c == '-') sign = -1, c = getchar();
    while(isd(c)) ans = (ans << 3) + (ans << 1) + c - '0', c = getchar();
    return sign == 1 ? ans : -ans;
}

/* --------------------------CSYZ1921------------------------- */
#include <cmath>
int r;
double ans = acos(-1);

int main() {
    // freopen(".in", "r", stdin);
    // freopen(".out", "w", stdout);
    scanf("%d", &r);
    ans *= 2 * r;
    pr("%lf\n", ans);
    return 0;
}
/*
*/

Compiler output:
main.c:8:10: fatal error: cstdio: No such file or directory
    8 | #include <cstdio>
      |          ^~~~~~~~
compilation terminated.
Language: C

#include <A-CirclePond>
using namespace std;

int main (){
  int R;
  cin>>R;
  cout<<R*6.2830<<endl;
}


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

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

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

	cout << n * 6.28 << endl;
}

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

import math

R = int(input())

print(2*math.pi*R)

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

#include <bits/stdc++.h>
using namespace std;
#define PI 3.14159265358979323846
int main() {
  int n; cin >> n;
  printf("%.3f\n", (double)2*n*PI);
}



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<<r*3.14159265358979<<setprecision(32)<<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 <cmath>

using namespace std;

int main()
{
    int n;
    cin >> n;
    
    cout << n * 2 * 3.14159265358979323846 << endl;
}


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

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

using namespace std;
#define PI acos(-1)

int main(){
  
    int n;
    #scanf("%d", &n);
    float ans;
  	cin >> n ;
    #ans = 2*n*3.1415926;
  	ans = 2*n*PI;
    printf("%.2f", ans);  
}

Compiler output:
a.cc:11:6: error: invalid preprocessing directive #scanf
   11 |     #scanf("%d", &n);
      |      ^~~~~
a.cc:14:6: error: invalid preprocessing directive #ans
   14 |     #ans = 2*n*3.1415926;
      |      ^~~
Language: C++

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

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

 　float sum = 2 * M_PI * R;
  cout << sum;
}


Compiler output:
a.cc:8:2: error: extended character 　 is not valid in an identifier
    8 |  　float sum = 2 * M_PI * R;
      |  ^
a.cc: In function 'int main()':
a.cc:8:2: error: '\U00003000float' was not declared in this scope; did you mean 'float'?
    8 |  　float sum = 2 * M_PI * R;
      |  ^~~~~~~
      |  float
a.cc:9:11: error: 'sum' was not declared in this scope
    9 |   cout << sum;
      |           ^~~
Language: C

#include <bits/stdc++.h>
using namespace std;
// int facctorialMethod(int k){
//     int sum = 1;
//     for (int i = 1; i <= k; ++i)
//     {
//         sum *= i;
//     }
//     return sum;
// }
int main(){
    double N;
    cin >> N;
    // vector<string> vec(N);
    // for(int i=0;i<N;i++){
    //     cin >> vec.at(i);
    // }
    // vector<int> c(N);
    // sort(vec.begin(),vec.end());
    // string tmp = vec.at(0);
    // for(int i=1;i<N;i++){
    //     if(vec.at(i)==tmp){
    //         tmp = vec.at(i)
    //         c(i)
    //     }
    // }
    cout << 2.0*N*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 <bits/stdc++.h>
#define pi 3.14159
using namespace std;

int main(){
    int n;
    scanf("%d",&n);
    double ans=2*pi*(n*1.00);

    printf("%.20lf\n",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++


using namespace std;
 
int main() {
  int R;
 cin >> R;
    
    
    
    cout <<R* 3.14 << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:2: error: 'cin' was not declared in this scope
    6 |  cin >> R;
      |  ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | 
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout <<R* 3.14 << endl;
      |     ^~~~
a.cc:10:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:23: error: 'endl' was not declared in this scope
   10 |     cout <<R* 3.14 << endl;
      |                       ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 |
Language: C

#include<iostream>
using namespace std;
int r;

int main()
{
	cin >> r;
	cout << (long double)3.14159265358979*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>
using namespace std;

int main() {
  int a;
  cin >> a;
  cout << a * 3.14 << 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(){
float i = 0;
float j = 0;
cin >> i;
j = i * 3.1416;
cout << j << 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 <string>
#include <stdio.h>
#include <iostream>
#define ll long long
#define ld long double
#define PI 3.14159
using namespace std;
// string mul(string a, string b)
// {
//     string res="";
//     int n=a.length();
//     int m=b.length();
//     int len=n+m-1;
//     int carry=0;
//     for(int i=len;i>=0;i--)
//     {
//         int tmp=0;
//         for(int j=n-1;j>=0;j--)
//             if(i-j<=m && i-j>=1)
//             {
//                 int a1=a[j]-48;
//                 int b1=b[i-j-1]-48;
//                 tmp+=a1*b1;
//             }
//             tmp+=carry;
//             carry=tmp/10;
//             res=(char)(tmp%10 + 48)+res;
//     }
//     while(res.length()>1 && res[0]=='0') res.erase(0,1);
//     return res;
// }
int main()
{
    // string p="314159265358979323846";
    // string n;
    // cin >> n;
    // string ans=mul(mul(n,"2"),p);
    // cout<<ans;
    ll n;
    cin >> n;
    float c = n * 2 * PI;
    cout << c;
}

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

import java.util.*;
import java.io.*;
public class Main
{
  public static void main(String args[])
  {
    Scanner sc=new Scanner(System.in);
    double pi=3.14;
    double rad;
    rad=sc.nextDouble();
    double cir;
    cir=2*pi*rad;
    System.out.println("%.2f", cir);
  }
} 

Compiler output:
Main.java:13: error: no suitable method found for println(String,double)
    System.out.println("%.2f", cir);
              ^
    method PrintStream.println() is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(boolean) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(char) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(int) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(long) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(float) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(double) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(char[]) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(String) is not applicable
      (actual and formal argument lists differ in length)
    method PrintStream.println(Object) is not applicable
      (actual and formal argument lists differ in length)
1 error
Language: C

#include<iostream>
#include<iomanip>
using namespace std;
const double pi = 3.141592653589;

int main() 
{
	double data;
	cin >> data;
	long double ans = (double)(data + data) * pi;
	cout << std::fixed << std::setprecision(15);
	cout << ans << 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() {
  double R;
  cin >> R;
  
  cout << R*2*3.141592 << endl;
  
  
}


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

#include<bits/stdc++.h>

using namespace std;

const double pi=3.14159;

int main(){

    double n;cin>>n;
    double c=2*pi*n;
    cout<<c;

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 <cstdio>
#define Pi 3.141592635 
using namespace std;
double R;
double C;
int main()
{
	scanf("%lf",&R);
	C=2*R*Pi;
	printf("lf",C);
} 


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

#include <iostream>
using namespace std;

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

    cout << 2 * 3.141592 * 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 <bits/stdc++.h>
using namespace std;
// int facctorialMethod(int k){
//     int sum = 1;
//     for (int i = 1; i <= k; ++i)
//     {
//         sum *= i;
//     }
//     return sum;
// }
int main(){
    double N;
    cin >> N;
    // vector<string> vec(N);
    // for(int i=0;i<N;i++){
    //     cin >> vec.at(i);
    // }
    // vector<int> c(N);
    // sort(vec.begin(),vec.end());
    // string tmp = vec.at(0);
    // for(int i=1;i<N;i++){
    //     if(vec.at(i)==tmp){
    //         tmp = vec.at(i)
    //         c(i)
    //     }
    // }
    cout << 2.0000000000*N*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 <bits/stdc++.h>  // g++ -std=c++14 -o a a.cpp

using namespace std;

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

#define rep(i, n) for(int i = 0; i < (n); i++)
#define repto(i, n) for(int i = 0; i <= (n); i++)
#define all(c) (c).begin(), (c).end()
#define uniq(c) c.erase(unique(all(c)), (c).end())
#define _1 first
#define _2 second
#define pb push_back
#define INF 1145141919
#define MOD 1000000007
#define DEBUG(x) cout << #x << ": " << x << endl;

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

__attribute__((constructor)) void initial() {
    cin.tie(0);
    ios::sync_with_stdio(false);
}

const double PI = 3.141592;

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


Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>  // g++ -std=c++14 -o a a.cpp
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
#define ALL(obj) begin(obj), end(obj)
#define debug(x) cerr << #x << ": " << x << '\n'
using namespace std;
template <class T>
vector<T> make_vec(size_t a) {
    return vector<T>(a);
}
template <class T, class... Ts>
auto make_vec(size_t a, Ts... ts) {
    return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}
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;
}

using ll = long long;
using ull = unsigned long long;
const int INF = 1e9;
// const int MOD = 1e9 + 7;
using D = long double;
const D PI = std::acos(-1);
int main() {
    D R;
    cin >> R;
    cout << setprecision(10) << 2 * PI * R << 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

scanf(%d,&r);
printf(r*2*3.14);

Compiler output:
main.c:1:7: error: expected declaration specifiers or '...' before '%' token
    1 | scanf(%d,&r);
      |       ^
main.c:1:10: error: expected declaration specifiers or '...' before '&' token
    1 | scanf(%d,&r);
      |          ^
main.c:2:8: error: unknown type name 'r'
    2 | printf(r*2*3.14);
      |        ^
Language: C

#include <iostream>
#define PI 3.14159265359
using namespace std;
int R;

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


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

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: expected initializer before 'cin'
    6 |   cin >> R;
      |   ^~~
a.cc:7:18: error: 'R' was not declared in this scope
    7 |   cout << 2*M_PI*R << endl;
      |                  ^
Language: C

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

int main(){
    double a;
    cin>>a;
    cout<<fixed<<setprecision(2)<<2*a*3.141592653589793238462643383279502884197169399375105820979445923078164062862089986280348253421170679821480865132823067647093844609550582231725359408128481117450284102701938521109555964462294895493038196442881097566593344612847564823378678316527120190914564856692346034861045432664821339360726024914127372458700660631558817488152092096282925409171536436789259036001133053054882046652138414695194151160943305727036575959195309218611738193261179310511854807446237996274956735188575272489122793818301194912983367336244065664308602139494639522473719070217986094370277053921717629317675238467481846766940513200056812714526356082778577134275778960917363717872146844090122495343014654958537105079227968925892354201995611212902196086403441815981362977477130996051870721134999999837297804995105973173281609631859502445945534690830264252230825334468503526193118817101000313783875288658753320838142061717766914730359825349042875546873115956286388235378201667315642315632318742318732312842312832365832369732364722392310116732315642315632328732318742312832312832315842315832319742319732314772392310116732365632318712318722318742352832315842158323197423197323147723923101167323156423156323187223181231873231284231283231584231583231974231973231477239231011742345642318732328732362832315842315832369732314772392330172392310166732312842312832369682310882310116742312832312882319682310882310116742352862339642350882310116732312842312882319632310842310882310116732362832369632360882340169632312742312762314223101196323127423127623148223101923396323627623148223101196323127423127623148223101696323127423127423548101;
    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 t;
double ans;
cin >> t;
double ans = 2*3.141592*t;
cout << ans ;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: redeclaration of 'double ans'
    7 | double ans = 2*3.141592*t;
      |        ^~~
a.cc:5:8: note: 'double ans' previously declared here
    5 | double ans;
      |        ^~~
Language: C

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

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

    cout << 2*M_PI*r << endl;

    return 0;
}


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