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

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

typedef long long ll;

#define fastio ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define forr(i,m,n) for(ll i=m;i<n;i++)
#define testcase int t;cin>>t;while(t--)
#define all(v) v.begin(),v.end()
#define rev(v) v.rbegin(),v.rend()
#define pb push_back
#define endl "\n"
#define print(v) forr(i,0,v.size())cout<<v[i]<<" ";cout<<endl;
#define print_map(m) for(auto it=m.begin(); it!=m.end();it++) cout<<(*it).first<<" "<<(*it).second<<endl;
#define vi vector<int>
#define vp vector< pair<int, int> >

ll maxi(ll a, ll b){
	if(a>b) return a;
	return b;
}

ll mini(ll a, ll b){
	if(a>b) return b;
	return a;
}

bool sorter(pair<int, int> a, pair<int, int> b){
	if(a.second!=b.second) return a.second>b.second;
	return a.first>b.first;
}

int main(){
	fastio
	ll r; cin>>r;
	cout<<3.14159*2*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

import math

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

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

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using ll = long long;
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)

int main() {
	float r;
	cin >> r;
	float p;
	p = r *2* 3.14159265;
	cout << p << 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<stdio.h>
#define PI (22/7)
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope
    8 |   cin>>R;
      |   ^~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include<stdio.h>
  +++ |+#include <iostream>
    2 | #define PI (22/7)
a.cc:9:3: error: 'cout' was not declared in this scope
    9 |   cout<<2*R*PI;
      |   ^~~~
a.cc:9:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C

const float pi = 3.14159265359;
#include <stdio.h>

using namespace std;

int main(){
	int R;
	scanf("%d", &R);
	float cir = 2*pi*R;
	printf("%f", cir);
}

Compiler output:
main.c:4:1: error: unknown type name 'using'
    4 | using namespace std;
      | ^~~~~
main.c:4:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    4 | using namespace std;
      |                 ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
 int main() {
   
   int m,n;
   cin>>m>>n;
   for(int i = 0,x; i<n; i++);
     cin>>x;
     m -= x;
   }
   if(m<0) {
     cout<<-1;
   } else  {
     cout<<m;
     
   }


Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'x' was not declared in this scope
    8 |      cin>>x;
      |           ^
a.cc: At global scope:
a.cc:11:4: error: expected unqualified-id before 'if'
   11 |    if(m<0) {
      |    ^~
a.cc:13:6: error: expected unqualified-id before 'else'
   13 |    } else  {
      |      ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
 int main() {
   
   int m,n;
   cin>>m>>n;
   for(int i = 0,x; i<n; i++) {
     cin>>x;
     m -= x;
   }
   if(m<0) {
     cout<<-1;
   } else  {
     cout<<m;
     
   }


Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: expected '}' at end of input
   16 |    }
      |     ^
a.cc:3:13: note: to match this '{'
    3 |  int main() {
      |             ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
 int main() {
   
   int m,n;
   cin>>m>>n;
   for(int i = 0,x; i<n; i++) {
     cin>>x;
     m -= x;
   }
   if(m<0){
     cout<<-1;
   } else {
     cout<<m;
     return 0;
   }


Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: expected '}' at end of input
   16 |    }
      |     ^
a.cc:3:13: note: to match this '{'
    3 |  int main() {
      |             ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
 int main(){
   
   int m,n;
   cin>>m>>n;
   for(int i = 0,x; i<n; i++){
     cin>>x;
     m -= x;
   }
   if(m<0){
     cout<<-1;
   } else {
     cout<<m;
     return 0;
   }

Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: expected '}' at end of input
   16 |    }
      |     ^
a.cc:3:12: note: to match this '{'
    3 |  int main(){
      |            ^
Language: C++

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

  cout<<2  * 3.14;
 return 0;
}


Compiler output:
a.cc:5:2: error: expected initializer before 'int'
    5 |  int r;
      |  ^~~
a.cc:6:2: error: 'cin' does not name a type
    6 |  cin>>r;
      |  ^~~
a.cc:8:3: error: 'cout' does not name a type
    8 |   cout<<2  * 3.14;
      |   ^~~~
a.cc:9:2: error: expected unqualified-id before 'return'
    9 |  return 0;
      |  ^~~~~~
a.cc:10:1: error: expected declaration before '}' token
   10 | }
      | ^
Language: C

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

  cout <<2　＊　3.14<<;
 return 0;
}


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

#include <bitts/stdc++.h>
using namespace std;;
 int main()
 
 int r,pai;
 cin << r <<:

  cout <<2　＊　pai:
}


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

#include <bitts/std.h>
using space std;;
 int main()
 
 int r,pai;
 cin << r <<:

  cout <<2　＊　pai:
}

Compiler output:
a.cc:1:10: fatal error: bitts/std.h: No such file or directory
    1 | #include <bitts/std.h>
      |          ^~~~~~~~~~~~~
compilation terminated.
Language: C

//-- Araz Jabrayilov --
//-- araz17 - zuna#1041 --

#include <bits/stdc++.h>

#define ll long long
#define endl '\n'

using namespace std;

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

    int n = 0;

    cin >> n;

    cout << 2 * 3.14159265359 * n << endl;

    return 0;
}



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

#include <bits/stdc++.h>

#define ll long long
#define endl '\n'

using namespace std;

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

    int n = 0;

    cin >> n;

    cout << 2 * 3.14159265359 * n << endl;

    return 0;
}



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

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define mp make_pair
#define pb push_back
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)


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

  long double r;
  cin >> r;
  cout << fixed << setprecision(12) << r*M_PI*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


#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

void solve() {
	int r;	cin >> r;
	cout << 2*3.14159*r << endl;
}

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


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

#include<bits/stdc++.h>
using namespace std;
int main(){
  int R;
  cin>>R;
  float ans=2*3.14159*R;
  printf("%f",ans);
  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;
    cin >> r;
    double pi = acos(-1);
    cout << fixed << setprecision(10) << 2 * r * pi << endl;
}


Compiler output:
main.c:1:11: 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<<2*R*3.14159<< 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;
  cin>>R;
  double a=3.14;
  
  cout<<2*R*a<< 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;
  cin>>R;
  double a=3.14;
  
  cout<<2*R*a<< endl;
  
  

  // dataの中で隣り合う等しい要素が存在するなら"YES"を出力し、そうでなければ"NO"を出力する
  // ここにプログラムを追記
}

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

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

int main(void){
  int R;
  cin>>R;
  double pie=3.1415;
  cout<<2*R*pie<<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

import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int R = sc.nextInt();
    double X = Math.PI;

    System.out.println(2 * R * X);
  }
}

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:3:1: error: unknown type name 'class'
    3 | class Main {
      | ^~~~~
main.c:3:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    3 | class Main {
      |            ^
Language: C

#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
int main(int argc, const char * argv[]) {
    int R;
    scanf("%d",&R);
    printf("%f",R*M＿PI);
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:8:19: error: 'M\U0000ff3fPI' undeclared (first use in this function)
    8 |     printf("%f",R*M＿PI);
      |                   ^~~~~
main.c:8:19: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <iostream>
using namespace std;

int main(){
  double R;
cin >> R;
ans = 2*R*3.14;
cout  << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:1: error: 'ans' was not declared in this scope; did you mean 'abs'?
    7 | ans = 2*R*3.14;
      | ^~~
      | abs
Language: C++

#include <iostream>
using namespace std;

int main(){
  double R;
cin >> R
ans = 2*R*3.14
cout  << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: expected ';' before 'ans'
    6 | cin >> R
      |         ^
      |         ;
    7 | ans = 2*R*3.14
      | ~~~
Language: C

#include <stdio.h>
#include <math.h>
int main(void){
	int r;
  	scanf("%d",&r);
  	
  	printf("%d\n", r * 2 * pi);
}

Compiler output:
main.c: In function 'main':
main.c:7:32: error: 'pi' undeclared (first use in this function)
    7 |         printf("%d\n", r * 2 * pi);
      |                                ^~
main.c:7:32: note: each undeclared identifier is reported only once for each function it appears in
Language: Java

import java.util.*;

public class App {
    public static void main(String[] args) throws Exception {
        System.out.println("Hello Java");
        Scanner scan = new Scanner(System.in);
		int num = scan.nextInt();
        scan.close();
		System.out.println( num * 2 * Math.PI);
    }
}

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

public class Main {
    public static void main(String[] args) throws Exception {
        System.out.println("Hello Java");
        Scanner scan = new Scanner(System.in);
		int num = scan.nextInt();
        scan.close();
		System.out.println( num * 2 * Math.PI);
    }
}

Compiler output:
Main.java:4: error: cannot find symbol
        Scanner scan = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:4: error: cannot find symbol
        Scanner scan = new Scanner(System.in);
                           ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

#include <iostream>
using namespace std;

int main() {
double  R
double 2πR

2πR = 2*π*R;

cout << 2πR << endl;

return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:1: error: expected initializer before 'double'
    6 | double 2πR
      | ^~~~~~
a.cc:10:9: error: unable to find numeric literal operator 'operator""\U000003c0R'
   10 | cout << 2πR << endl;
      |         ^~~
Language: C++

#include <iostream>
using namespace std;

int main() {
double  R
double 2πR

2πR = 2*π*R

cout << 2πR << endl;

return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:1: error: expected initializer before 'double'
    6 | double 2πR
      | ^~~~~~
Language: C

int main() {
  int R ;
  cin >> R ;
  cout << 2 * 3.14 * R << endl;
  
}


Compiler output:
main.c: In function 'main':
main.c:3:3: error: 'cin' undeclared (first use in this function)
    3 |   cin >> R ;
      |   ^~~
main.c:3:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:4:3: error: 'cout' undeclared (first use in this function)
    4 |   cout << 2 * 3.14 * R << endl;
      |   ^~~~
main.c:4:27: error: 'endl' undeclared (first use in this function)
    4 |   cout << 2 * 3.14 * R << endl;
      |                           ^~~~
Language: C


using namespace std;

int main() {
  int R ;
  cin >> R ;
  cout << 2 * 3.14 * R << endl;
  
}


Compiler output:
main.c:2:1: error: unknown type name 'using'
    2 | using namespace std;
      | ^~~~~
main.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespace std;
      |                 ^~~
main.c: In function 'main':
main.c:6:3: error: 'cin' undeclared (first use in this function)
    6 |   cin >> R ;
      |   ^~~
main.c:6:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:3: error: 'cout' undeclared (first use in this function)
    7 |   cout << 2 * 3.14 * R << endl;
      |   ^~~~
main.c:7:27: error: 'endl' undeclared (first use in this function)
    7 |   cout << 2 * 3.14 * R << endl;
      |                           ^~~~
Language: C++

#include <iostream>
using namespace std;

int main() {
double  R
double 2πR

2πR = 2*π*R

cout << 2πR << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:6:1: error: expected initializer before 'double'
    6 | double 2πR
      | ^~~~~~
a.cc:10:21: error: expected '}' at end of input
   10 | cout << 2πR << endl;
      |                     ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
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:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
#include <iomanip>
using namespace std;
int main() {
	int r;
	cin >> r;
	cout << setprecision(20) << 2 * r * 22 / 7.0;
	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 << setprecision(20) << 2 * r * 22 / 7.0;
	return 0;
}

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

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

int main() {
  
  int r;
  cin >> r;
  
  cout << r*2*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 () {
 int r;
 cin>>r;
 double pi = 3.1415926535897,A;
A=2*pi*r;
cout<<fixed<<setprecision(8)<<A;


 }


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>

int main(){
    double r;
    double ans;

    std::cin >> r;
    ans = 2 * M_PI * r;
    std::cout << ans << std::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() {
	long r;
  	double pi = 3.141592
    cin >> r;
    cout << (r+r)*pi << endl; 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: expected ',' or ';' before 'cin'
    6 |     cin >> r;
      |     ^~~
Language: C

#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
#define SIZE 200005
#define INF 1000000005LL
#define MOD 1000000007

using namespace std;
typedef long double ll;
typedef pair <int,int> P;

int main(){

  ll R=0;

  cin >> R;

  cout << setprecision(20) << fixed;
  cout << R*6.28318530717958623200 << 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>
#include<sstream>
#include<algorithm>
#include<vector>
#include<string>
 
using namespace std;

int main() {
    double r;
    cin >> r;
    double pi = 3.14;
    cout << (double)2 * r * pi << endl;
}

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

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

int main() {
    double r;
    cin >> r;
    double pi = 3.14;
    cout << (double)2 * r * 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() {
    double r;
    cin >> r;
    cout << (double)2 * r * 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() {
    double r;
    cin >> r;
    cout << r * 2 * 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() {
    int r;
    cin >> r;
    cout << r * 2 * 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(){
    double a;
    cin>>a;
    cout<<r*M_PI*2<<endl;
}


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

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

int main() {
  cout << "Hello, world!" << 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>
#include <math.h>
using namespace std;

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

int main() {
  string s;
  double r;
  
  
 cin>>r;
  
  
    cout<<2*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<iostream>
#include<sstream>
#include<algorithm>
#include<vector>
#include<string>

using namespace std;
typedef long long ll;

int main(){
	double R;
	cin>>R;
	double pi = 3.14;
	cout<<(double)2 *pi * R<<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<stdio.h>
#include<math.h>
int main()
{
  int n;
  scanf("%d",&n);
  printf("%lf",((double)n * n * M_PI);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:7:38: error: expected ')' before ';' token
    7 |   printf("%lf",((double)n * n * M_PI);
      |         ~                            ^
      |                                      )
main.c:8:12: error: expected ';' before '}' token
    8 |   return 0;
      |            ^
      |            ;
    9 | }
      | ~
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; (i) < (int)(n); ++ (i))
#define REP3(i, m, n) for (int i = (m); (i) < (int)(n); ++ (i))
#define REP_R(i, n) for (int i = (int)(n) - 1; (i) >= 0; -- (i))
#define REP3R(i, m, n) for (int i = (int)(n) - 1; (i) >= (int)(m); -- (i))
#define ALL(x) ::std::begin(x), ::std::end(x)
using namespace std;


double solve(int64_t R) {
    // TODO: edit here
    cout << (LD) R*M_PI*2 << endl;
}

// generated by online-judge-template-generator v4.1.0 (https://github.com/kmyk/online-judge-template-generator)
int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    constexpr char endl = '\n';
    int64_t R;
    cin >> R;
    auto ans = solve(R);
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'double solve(int64_t)':
a.cc:12:14: error: 'LD' was not declared in this scope
   12 |     cout << (LD) R*M_PI*2 << endl;
      |              ^~
a.cc:13:1: warning: no return statement in function returning non-void [-Wreturn-type]
   13 | }
      | ^
Language: C

#include <bits/stdc++.h>

#define int long long

using namespace std;

const int oo = 2e18;

const double pi = acos(-1);

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cout << setprecision(12) << fixed << '\n';

    double R;
    cin >> R;

    cout << 2.0*pi*R << '\n';
    return 0;
}

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

#include <bits/stdc++.h>
using namespace std;
int main() {
int R;
cin>>R;
cout<<R*3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172 5359408128 4811174502 8410270193 8521105559 6446229489 5493038196 4428810975 6659334461 2847564823 3786783165 2712019091 4564856692 3460348610 4543266482 1339360726 0249141273 7245870066 0631558817 4881520920 9628292540 9171536436 7892590360 0113305305 4882046652 1384146951 9415116094 3305727036 5759591953 0921861173 8193261179 3105118548 0744623799 6274956735 1885752724 8912279381 8301194912 9833673362 4406566430 8602139494 6395224737 1907021798 6094370277 0539217176 2931767523 8467481846 7669405132 0005681271 4526356082 7785771342 7577896091 7363717872 1468440901 2249534301 4654958537 1050792279 6892589235 4201995611 2129021960 8640344181 5981362977 4771309960 5187072113 4999999837 2978049951 0597317328 1609631859 5024459455 3469083026 4252230825 3344685035 2619311881 7101000313 7838752886 5875332083 8142061717 7669147303 5982534904 2875546873 1159562863 8823537875 9375195778 1857780532 1712268066 1300192787 6611195909 2164201989 3809525720 1065485863 2788659361 5338182796 8230301952 0353018529 6899577362 2599413891 2497217752 8347913151 5574857242 454150695<<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
cin>>R;
cout<<R*1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172 5359408128 4811174502 8410270193 8521105559 6446229489 5493038196 4428810975 6659334461 2847564823 3786783165 2712019091 4564856692 3460348610 4543266482 1339360726 0249141273 7245870066 0631558817 4881520920 9628292540 9171536436 7892590360 0113305305 4882046652 1384146951 9415116094 3305727036 5759591953 0921861173 8193261179 3105118548 0744623799 6274956735 1885752724 8912279381 8301194912 9833673362 4406566430 8602139494 6395224737 1907021798 6094370277 0539217176 2931767523 8467481846 7669405132 0005681271 4526356082 7785771342 7577896091 7363717872 1468440901 2249534301 4654958537 1050792279 6892589235 4201995611 2129021960 8640344181 5981362977 4771309960 5187072113 4999999837 2978049951 0597317328 1609631859 5024459455 3469083026 4252230825 3344685035 2619311881 7101000313 7838752886 5875332083 8142061717 7669147303 5982534904 2875546873 1159562863 8823537875 9375195778 1857780532 1712268066 1300192787 6611195909 2164201989 3809525720 1065485863 2788659361 5338182796 8230301952 0353018529 6899577362 2599413891 2497217752 8347913151 5574857242 454150695<<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>
#include <string>
#include <array>


using namespace std;

int main(){
	
	int r;

	
	cin >> r;
	
	float c = 2 * M_PI * float(r);
	
	cout << c;
}	



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 <string>
#include <array>
#include <math.h>

using namespace std;

int main(){
	
	int r;

	
	cin >> r;
	
	float c = 2 * M_PI * float(r);
	
	cout << c;
}	

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++

double n; cin >> n;
cout << 2*n*3.14;

Compiler output:
a.cc:1:11: error: 'cin' does not name a type
    1 | double n; cin >> n;
      |           ^~~
a.cc:2:1: error: 'cout' does not name a type
    2 | cout << 2*n*3.14;
      | ^~~~
Language: C++

double n ; cin >> n;
cout << n * 3.14;

Compiler output:
a.cc:1:12: error: 'cin' does not name a type
    1 | double n ; cin >> n;
      |            ^~~
a.cc:2:1: error: 'cout' does not name a type
    2 | cout << n * 3.14;
      | ^~~~
Language: C++

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

Compiler output:
a.cc:2:1: error: 'cin' does not name a type
    2 | cin>>R;
      | ^~~
a.cc:3:1: error: 'cout' does not name a type
    3 | cout<<2*3.14*R<<endl;
      | ^~~~
Language: C

#include <bits/stdc++.h>

using namespace std;
typedef pair <int, int> pii;
#define pb push_back
#define mp make_pair
#define ll long long
#define PI acos(-1)

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

int main(){
  int r;
  cin>>r;
  cout<<2*math.pi*r;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>r;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<2*math.pi*r;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:11: error: 'math' was not declared in this scope
    6 |   cout<<2*math.pi*r;
      |           ^~~~
Language: C++

#include<bits/stdc++.h>
usign namespace std;
int main()
{
  int r;
  cin>>r;
  cout<<2*3.14159265359*r<<"\n";
}

Compiler output:
a.cc:2:1: error: 'usign' does not name a type
    2 | usign namespace std;
      | ^~~~~
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 /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:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout<<2*3.14159265359*r<<"\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

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

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

    cout << fixed << setprecision(20) << 2 * M_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

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

int const MOD = 1e9+5;

#define  pi acos(-1.00)
#define fastIO ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define newLine printf("\n")
#define start_p int main()
#define end_p return 0
#define test_IO freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout)
#define pb push_back

typedef long long ll;
typedef vector<int> vi;
typedef vector<char> vc;


start_p{
    #ifndef ONLINE_JUDGE
    //test_IO;
    #endif // ONLINE_JUDGE

    double r; cin>>r;
    double c = 2*pi*r;
    cout<<setprecision(20)<<fixed<<c<<endl;
    //67252742410977361942
    end_p;
}



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;
static int fast_io = []() { std::ios::sync_with_stdio(false); cin.tie(nullptr); return 0; }();
# define M_PI           3.14159265358979323846  /* pi */
int main(){
  double r;
  cin>>r;
  cout<<M_PI*2*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

#include <bits/stdc++.h>

using namespace std;

#define LL long long
#define ULL unsigned LL
#define LD long double
#define debug(x) cerr << #x << " " << x << endl;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	LD r;
	cin>>r;
	LD w = 2.0 * M_PI * r;
	cout<<setprecision(10)<<fixed<<w;
}


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

#include <bits/stdc++.h>

#define int long long
#define fastio ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)

const unsigned int mod = 1e9 + 7;

using namespace std;

int32_t main() {
	fastio;

	int r;
	cin >> r;
	cout << 2.0 * 3.14 * 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<stdio.h>
int main()
{
  int r;
  scanf("%d",&r);
  float t=2*3.1416*r;
  printf("%f",t);

Compiler output:
main.c: In function 'main':
main.c:7:3: error: expected declaration or statement at end of input
    7 |   printf("%f",t);
      |   ^~~~~~
Language: C

#include<iostream>
#include<cstdio>
#include<string>
#include<cmath>

using namespace std;

int main()
{
    double r,s;
    double pi=3.141;
    cin>>r;
    s=2*pi*r;
    cout<<s<<endl;
    //system("pause");
    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 r;
    cin>>r;
    double ans=2*M_PI*r;
    cout<<ans;
}


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

#include<bits/stdc++.h>
using namespace std;
#define FASTIO ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pil pair<int,ll>
#define pli pair<ll,int>
#define mod 1000000000
#define mp make_pair
#define pb push_back
#define ff first
#define ss second
#define pi 3.14159
ll power(ll a,int n){
	if(n==0)
	  return 1;
	if((n%2)==0)
	  return power(a*a,n/2);
	else
	  return a*power(a*a,n/2);    
}
int main(){
FASTIO
double r;
cin>>r;
cout<<2*pi*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

#include<stdio.h>
#include<math.h>
int main()
{
  int n;
  printf("%f",n * n * PI);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:23: error: 'PI' undeclared (first use in this function)
    6 |   printf("%f",n * n * PI);
      |                       ^~
main.c:6:23: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int r;
	cin>>r;
	cout<<2*3.1416*r<<endl;
	return 0;
}

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

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

int main() {
    double n;
    cin >> n;
    printf("%0.20f", 2*n*acos(-1));
}


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 ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vl vetcor<ll>
#define vii vector<pii>
#define vll vector<pll>
#define IOS ios_base::sync_with_stdio(false)
using namespace std;
double long pi = 3.14159265;
int main()
{
	double r;
	cin>>r;
	cout<<fixed<<setprecision(10);
	cout<<2 * r * 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(void) {
  double r;
  cin >> r;

  cout << fixed << setprecision(5) << r*2*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 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()
using namespace std;
typedef long long ll;
typedef vector<string> vs;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef pair<int, int> Pi;
typedef queue<Pi> QPi;
typedef pair<ll, ll> Pll;
typedef queue<Pll> QPll;
typedef vector<vi> Graph;
const int mod = 1000000007;
// 小数点　<< fixed << setprecision(0) <<
// sort降順　sort(ALL(),greater<int>());
// 円周率　M_PI
// 文字判定　isupper islower
// 順列　do {} while(next_permutation(ALL(X)));
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};
struct edge {
    int from; //出発点
    int to;   //到達点
    int cost; //移動コスト
};
typedef struct edge se;
typedef vector<edge> ve;
unsigned euclidean_gcd(unsigned a, unsigned b) {
  if(a < b) return euclidean_gcd(b, a);
  unsigned r;
  while ((r=a%b)) {
    a = b;
    b = r;
  }
  return b;
}

int main() {
  double r;
  cin >> r;
  double ans=2*M_PI*r;
  cout << fixed << setprecision(4) << 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

using namespace std;

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

Compiler output:
main.c:1:1: error: unknown type name 'using'
    1 | using namespace std;
      | ^~~~~
main.c:1:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    1 | using namespace std;
      |                 ^~~
main.c: In function 'main':
main.c:5:5: error: 'cin' undeclared (first use in this function)
    5 |     cin >> r;
      |     ^~~
main.c:5:5: note: each undeclared identifier is reported only once for each function it appears in
main.c:6:5: error: 'cout' undeclared (first use in this function)
    6 |     cout << r * 2 * 3.14 << endl;
      |     ^~~~
main.c:6:29: error: 'endl' undeclared (first use in this function)
    6 |     cout << r * 2 * 3.14 << endl;
      |                             ^~~~
Language: C

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

Compiler output:
main.c: In function 'main':
main.c:3:5: error: 'cin' undeclared (first use in this function)
    3 |     cin >> r;
      |     ^~~
main.c:3:5: note: each undeclared identifier is reported only once for each function it appears in
main.c:4:5: error: 'cout' undeclared (first use in this function)
    4 |     cout << r * 2 * 3.14 << endl;
      |     ^~~~
main.c:4:29: error: 'endl' undeclared (first use in this function)
    4 |     cout << r * 2 * 3.14 << endl;
      |                             ^~~~
Language: C

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

Compiler output:
main.c:2:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before '>>' token
    2 |     cin >> r;
      |         ^~
main.c:3:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<<' token
    3 |     cout << r * 2 * 3.14 << endl;
      |          ^~
Language: C

#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
int main()
{
   ios_base::sync_with_stdio(false);
   cin.tie(NULL);
    ll t=1;
    //cin>>t;
    while(t--)
    {
        double n;
        cin>>n;
        double ans=(n*2)*3.14159;
        cout<<ans;
    }
}



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

#include <iostream>
using namespace std;

int main()
{
    double r, p = 3.14159265;

    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: C

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

#define ll long long
#define rep(i,x,y) for(int i=x;i<y;i++)
#define rel(i,x,y) for(int i=x-1;i>=y;i--)
#define all(x) x.begin(),x.end()

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
    long double r; cin >> r;
    cout << r * 2.0 * 3.141592 << endl;
}

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

#include<iostream>
using namespace std;
main()
{
	int r;
	cin>>r;
	float pi=3.14159;
	float R=2*(float)r;
	float ans=R*pi;
	printf("%.2f",ans);
}


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

#include<iostream>
using namespace std;
main()
{
  float r;
  cin>>r;
  float pi=3.14;
  float ans=2*pi*r;
  printf("%.2f",ans);
}

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() {

  ios::sync_with_stdio(false);
  cout.tie(nullptr);
  cin.tie(nullptr);
  cout << fixed << setprecision(10);
  
  int r;
  cin >> r;

  cout << 2.0 * r * acos(-1) << '\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: Java

import java.util.*;
import java.lang.Math;
public class ABC163A{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        System.out.println(sc.nextInt()*Math.PI*2);
    }
}

Compiler output:
Main.java:3: error: class ABC163A is public, should be declared in a file named ABC163A.java
public class ABC163A{
       ^
1 error
Language: C

#define _USE_MATH_DEFINES
#include<bits/stdc++.h>
#include<unordered_set>
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define LSB(i) ((i) & -(i))
#define MAXSIZE 100000000

using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;

int gcd(int a, int b) { return b == 0 ? a : gcd(b, a % b); }
int lcm(int a, int b) { return a * (b / gcd(a, b)); }

int main() {

	ios::sync_with_stdio(0); cin.tie(0);

	//freopen("in.txt", "r", stdin);
	//freopen("out.txt", "w", stdout);

	double n; cin >> n;
	cout << (n * 2) * M_PI << "\n";
}


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

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

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


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

#include <bits/stdc++.h>
using namespace std;
#define itn int
#define nibu(K, x) binary_search(K.begin(), K.end(), x)
#define rep(i, n) for (int i = 0; i < n; i++)
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define out(x) cout << x << endl
#define put(x) out(x)
#define in(x) cin >> x
#define maxx(a, b, c) max(a, max(b, c))
#define minn(a, b, c) min(a, min(b, c))
using ll = long long;
using vl = vector<ll>;
using vs = vector<string>;
const double pi = 3.14159265358979;
const ll mod = 1000000007;

int main()
{
    double N;
    in(N);
    cout << fixed << setprecision(10) << N * 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<iostream>
using namespace std;

int main(void) {
  int radius;
  static const double pi = 3.141592653589793;
  std::cin>>radius;
  std::cout<<2*radius*a<std::endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:23: error: 'a' was not declared in this scope
    8 |   std::cout<<2*radius*a<std::endl;
      |                       ^
Language: C++

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

int main(void) {
  int radius;
  double a = std::numbers::pi;
  std::cin>>radius;
  std::cout<<2*radius*a<std::endl;

  return 0;
}


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

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

#ifdef LOCAL
#define debug(var) cerr << (#var) << " = " << (var) << endl;
#else
#define debug(var)
#endif

void init() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
}

void solve() {
    int n; scanf("%d", &n);
    printf("%.10lf", n*2*3.1415926535)
}

int main() {
    init();
    int t = 1; //scanf("%d", &t);
    while (t--) {
        solve();
    }
    return 0;
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:17:39: error: expected ';' before '}' token
   17 |     printf("%.10lf", n*2*3.1415926535)
      |                                       ^
      |                                       ;
   18 | }
      | ~
Language: C

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

#ifdef LOCAL
#define debug(var) cerr << (#var) << " = " << (var) << endl;
#else
#define debug(var)
#endif

void init() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
}

void solve() {
    int n; scanf("%d", &n);
    printf("%.10lf", n*2*3.1415926535)
}

int main() {
    init();
    int t = 1; //scanf("%d", &t);
    while (t--) {
        solve();
    }
    return 0;
}

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

#include<iostream>
using namespace std;

int main(){
 	long long r=0;
 	
	cin >> r;
  	cout<<2*r*3.14159265358979<<end;
	return 0; 
}

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