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

#include <stdio.h>
double r, a;
main(){
scanf(%lf,&r);
	
    a = 2*3.14*r;
    
    printf(a,&a);
}

Compiler output:
main.c:3:1: error: return type defaults to 'int' [-Wimplicit-int]
    3 | main(){
      | ^~~~
main.c: In function 'main':
main.c:4:7: error: expected expression before '%' token
    4 | scanf(%lf,&r);
      |       ^
main.c:8:12: error: incompatible type for argument 1 of 'printf'
    8 |     printf(a,&a);
      |            ^
      |            |
      |            double
In file included from main.c:1:
/usr/include/stdio.h:363:43: note: expected 'const char * restrict' but argument is of type 'double'
  363 | extern int printf (const char *__restrict __format, ...);
      |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
Language: C

#include <bits/stdc++.h>

using namespace std;

int main() {
    int x;
    cin>>x;
    printf("%.2f",(float(2*x*3.14159265)));
}

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>
#define _GLIBCXX_DEBUG
#define rep(i,n) for(int i=0;i<(n);++i)
#define dunk(a) cout << (a) << endl
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
using namespace std;
typedef long long ll;

int main() {
	double r; cin >> r;
	double ans = r * 6.2831853;
	cout << ans << fixed << setprecision(5);
	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

//
//  second.cpp
//  CoderTest
//
//  Created by yuya on 2019/07/25.
//  Copyright © 2019 yuya. All rights reserved.
//

#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair <int,int> P;
#define all(x) (x).begin(), (x).end()
#define rep(i,n) for(int (i) = 0; (i) < (int)(n); i++)
#define rep1(i,n) for(int (i) = 1; (i) <= (int)(n); i++)
#define INF 1000000
#define MOD 998244353



int main()
{
    double R;
    cin >> R;
    
    cout << setprecision(9) << 2*R*M_PI << endl;
    
    
    
    return 0;
}




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

#include <bits/stdc++.h>

#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n - 1; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i <= n; i++)
#define FORR(i, m, n) for(int i = m; i >= n; i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VSORTR(v) sort(v.rbegin(), v.rend());
#define ALL(v) (v).begin(),(v).end()
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vector<ll>>;
using P = pair<ll, ll>;
const ll mod = 1e9+7;


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

    double pi=3.14159;
    double r;cin>>r;
    cout<<2*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;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

#define PI 3.1415926535

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

    cout << (double)N * (double)2.0 * (double)PI;

}


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

#include <iostream>

using namespace std;

int main () 
{
  int a;
  cin >> a;
  a *= 3.14159; 
  a *= 2;
  cout << a << '\n';
  }


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;
cout<<2*R*22/7;
}


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 <algorithm>
#include <cmath>
#include <vector> 
#include <cstring>
#include <queue>
#include <ctime>
#include <set>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,int> pli;
const ll INF = 10e16;
const int maxN = 200010;
const int maxD = 15;
const int maxH = 100; 
const int MOD = 1000000007;


vector<string> ans;
vector<int> p;


int main()
{
	double p = 3.1415926;
	int R;
	cin>>R;
	double ans = p * R * 2;
	printf("%f\n",ans); 
	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 pi 3.14159

int main() {
    int r;
    cin >> r;
    double  x = (double)2 * pi * r;
    cout <<fixed << setprecision(3) << x << 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;
const double PI = 6.28318530717958623200;
int main()
{
	double c, r;
	cin >> r;
	c = r * PI;
	cout << c << 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;
  ans=R*6.28;
  cout<<ans;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'ans' was not declared in this scope; did you mean 'abs'?
    8 |   ans=R*6.28;
      |   ^~~
      |   abs
Language: Java

import java.util.Scanner;
 
public class InputSample {
    public static void main(String[] args) {
        int R = 0;
        int sum = 0;
        Scanner scan = new Scanner(System.in);
        R = scan.nextInt();
        sum = R * 2 * 3.141592;
        System.out.println(sum);
        scan.close();
    }
}

Compiler output:
Main.java:3: error: class InputSample is public, should be declared in a file named InputSample.java
public class InputSample {
       ^
Main.java:9: error: incompatible types: possible lossy conversion from double to int
        sum = R * 2 * 3.141592;
                    ^
2 errors
Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

const double PI = acos(-1.0);

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

	cout << 2.0 * PI * R << endl;

	return 0;
}

Compiler output:
a.cc:8:19: error: 'acos' was not declared in this scope
    8 | const double PI = acos(-1.0);
      |                   ^~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
#define SORT(a) sort((a).begin(), (a).end())
#define RSORT(a) reverse((a).begin(), (a).end())
#define rep(i, n) for (int i = 0; i < n; i++)
typedef long long ll;
const long long INF = 1LL << 60;
// const int INF=1010101010;
using Graph = vector<vector<int>>;

int main() {
  double r;
  cin >> r;
  cout << 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;
long long int R;
int main()
{
	cin>>R;
	cout<<6.28*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<bits/stdc++.h>
using namespace std;
int main() {
    // int t;cin>>;while(t--){}
    double n;cin>>n;
    cout.precision(18);
    cout<< 2*n*(3.141592653589793238);
}

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

#cording:utf-8

import math

R=float(input())
L=2*math.pi*R
print("L={0}".format(L))


Compiler output:
main.c:1:2: error: invalid preprocessing directive #cording
    1 | #cording:utf-8
      |  ^~~~~~~
main.c:3:1: error: unknown type name 'import'
    3 | import math
      | ^~~~~~
main.c:5:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'R'
    5 | R=float(input())
      | ^
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 *= r;
    pr("%.2lf\n", ans);
    return 0;
}
/*
*/

Compiler output:
a.cc: In function 'int main()':
a.cc:35:20: error: expected ';' before 'ans'
   35 |     scanf("%d", &r)
      |                    ^
      |                    ;
   36 |     ans *= r;
      |     ~~~
Language: C

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

int main(){
  int r;
  cin >> r;
  float p = 3.1415;
  cout << 2*p*(float)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 <bits/stdc++.h>
using namespace std;

int main() {
  int 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>
using namespace std;

int main(){
  int R;
  cin>>R;
  const double PI=3.14159265358979323846;
  float L=(double)R*2.0*PI;
  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++

#include<iostream>
using namespace std;
int main()
{
  int R;
  cin >> R;
  cout<< 2*M_PI*R<<endl;
  
 return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:12: error: 'M_PI' was not declared in this scope
    7 |   cout<< 2*M_PI*R<<endl;
      |            ^~~~
Language: C++

#include<iostream>
int main() {
  double n;
  cin>>n;
  n *= 6.28;
  cout<<n;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |   cin>>n;
      |   ^~~
      |   std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<n;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

using namespace std;
const int m5=100042;
int main(void)
{
	const float pie=3.1415926;
	float r;
	cin>>r;
	cout<<(r*2*pie);
	return 0;
    return 0;
}


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:7:9: error: 'cin' undeclared (first use in this function)
    7 |         cin>>r;
      |         ^~~
main.c:7:9: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:9: error: 'cout' undeclared (first use in this function)
    8 |         cout<<(r*2*pie);
      |         ^~~~
Language: C

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define hell  1000000007
#define ios ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define pb   push_back

int main()
{
	ios;
	ll n;
	cin>>n;
	cout<<2*n*3.141592653589793238;
}

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 r;
  cin >> r;
  cout << r * (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

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define REP(i, n) for (ll i = 0; i < n; i++)
#define INF 9223372036854775807
#define all(x) (x).begin(), (x).end()

ll ts = 1000000007;
const double PI = acos(-1);

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

  ll r;
  cin >> r;

  cout << 2 * PI * r << "\n";
}

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

#include <iostream>

using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:21: error: expected ';' before 'cout'
    8 |   res = r * 2 * 3.14
      |                     ^
      |                     ;
    9 |   cout << res << endl;
      |   ~~~~
Language: C

import java.util.*;

class Main{
  public static void main(String[] args) {
    Scanner reader= new Scanner(System.in);
    double r =reader.nextDouble();
    System.out.println(2*r*3.14159265);




  }
}

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:3:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    3 | class Main{
      |           ^
Language: C

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <sstream> //C++
#include <queue> //C++
#include <string> //C++
#include <iostream> //C++
#include <vector> //C++
#include <algorithm> //C++
using namespace std; //C++
#define rep(i, a, n) for (i = (a); i < (n); i++)

//scanf("%d",&x);
//printf("%d",x);
//for(i=0;i<N;i++){  }
//if( == ){  }else{  }
//while( ){  }

/*
int N, i;
int H[100];
scanf("%d", &N);
for (i = 0; i < N; i++) scanf("%s", &H[i]);
*/




int main()
{
	int r;

	cin >> r;
	
	cout <<(double)( 2 * r * 3.14159265);

}




Compiler output:
main.c:6:10: fatal error: sstream: No such file or directory
    6 | #include <sstream> //C++
      |          ^~~~~~~~~
compilation terminated.
Language: C

#include <algorithm>
#include <cmath>
#include <complex>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <vector>
#include <functional>
#include <cstring>
#include <regex>
#include <random>
#include <cassert>
#include <stack>
using namespace std;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, s, n) for (int i = (s); i < (int)(n); i++)
#define revrep(i, n) for (int i = (n) - 1; i >= 0; i--)
#define revrepr(i, s, n) for (int i = (n) - 1; i >= s; i--)
#define debug(x) cerr << #x << ": " << x << "\n"
#define popcnt(x) __builtin_popcount(x)

using ll = long long;
using P = pair<int, int>;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

template<class T>
istream& operator >>(istream &is, vector<T> &v) {
    for (int i = 0; i < (int)v.size(); i++) cin >> v.at(i);
    return is;
}

template<class T, class U>
ostream& operator <<(ostream &os, pair<T, U> p) {
    cout << '(' << p.first << ", " << p.second << ')';
    return os;
}

template<class T>
void print(const vector<T> &v, const string &delimiter) { rep(i, v.size()) cout << (0 < i ? delimiter : "") << v.at(i); cout << endl; }

template<class T>
void print(const vector<vector<T>> &vv, const string &delimiter) { for (const auto &v: vv) print(v, delimiter); }

const double PI = acos(-1.0);

int main() {
    double r;
    cin >> r;
    printf("%.10lf\n", r * 2 * PI);
}

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;
#define ll long long int
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;   
#define ordered_set tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update> 
#define ld long double
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define all(a) a.begin(),a.end()
#define sz(a) (ll)(a.size())
int main()
{
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int r;
	cin>>r;
	ld Radius = r;
	ld pi = 3.14159265359;
	cout<<fixed<<setprecision(8)<<2*pi*Radius<<"\n";
	return 0;
}

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

#include <iostream>
#include <cstdio>
#include <stdlib.h>
#include <ctype.h>
#include <cstring>
#include <math.h>


int main(){
    double R;
    double A =3.141592653589793;
    scanf("%lf",&R);
    printf("%.15f",A*2*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 <stdio.h>

int main(){
	
    int a;
    float b = 0;
    
    scanf_s("%f",&a);
    
    b = a * 2 * 3.14;
    
    printf("%f",b);
    return 0;
    

}

Compiler output:
main.c: In function 'main':
main.c:8:5: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    8 |     scanf_s("%f",&a);
      |     ^~~~~~~
      |     scanf
Language: C

R = float(input())
l = 6.28318530717958623200*R
print(l)


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

#include <bits/stdc++.h>
using namespace std;
#define PI 3.14159

int main(){
    float n;
    cin >> n;
    float res = 2*PI*n;
    cout << res;
    return 0;
}


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

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

int main() {
    double r;
    cin >> r;
    cout << std::fixed << std::setprecision(15) << 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>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <queue>
#include <cmath>
#define S 10000005
#define SS 2000
#define SSS 300
#define ll long long
#define Pi 3.141592635 
using namespace std;
long double R;
long double C;
int main()
{
	scanf("%llf",&R);
	C=2*R*Pi;
	printf("%Lf",C);
} 


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;
typedef pair<int, int> pii;
typedef long long ll;
typedef pair<ll, ll> pll;

#define M_PI 3.14159265358979323846

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int R; cin >> R;
	cout << 2 * R * M_PI << '\n';
	return 0;
}

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

#include <cstdio>
#include<iostream>
#include<map>
#include<algorithm>
#include<vector>
#include <cmath>
#include <iomanip>
#include <regex>
#include <queue>
#include <set>
#include <cassert>
using namespace std;
using ll = long long;
using plong = pair<ll,ll>;
ll MOD=998244353;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int main(){
    double A;
    cin>>A;
    double res = A*2*3.1415926535;
    printf("%.10f\n",res);

}


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

/*
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
*/
#include <bits/stdc++.h>

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

int main()
{
    int r;
    cin >> r;
    cout << (double)2.0 * r * 3.141592;
    return 0;
}


Compiler output:
main.c:7:10: fatal error: bits/stdc++.h: No such file or directory
    7 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
int main (){cin.tie(0);
cin.sync_with_stdio(0);

double a=22.0/7.0,r;
cin>>r;
cout<<fixed<<setprecision(3)<<r*a*2;
}



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

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

int main(){
    double a;
    cin>>a;
    cout<<fixed<<setprecision(2)<<2*a*3.1415926;
    return 0;
}

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

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

const double PI=3.1415926535897932;

int main(){
    int r;
    cin >> r;
    double r_=(double)r;
    cout << PI*r_*2 <<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>
#include <iostream>
#include <iomanip>

using namespace std;
int main(void){
    // Your code here!
    
    long long R;
    const double PI=3.14159265358979323846;
    
    cin >> R;
    
    cout << setprecision(15) << 2* double(R)*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;

#define ll                      long long
#define pii                     pair<int, int>
#define pli                     pair<ll, int>
#define pil                     pair<int, ll>
#define pll                     pair<ll, ll>
#define vi                      vector<int>
#define vll                     vector<ll>
#define vb                      vector<bool>
#define vd                      vector<double>
#define vs                      vector<string>
#define ff                      first
#define ss                      second
#define pb                      push_back
#define eb                      emplace_back
#define ppb                     pop_back
#define pf                      push_front
#define ppf                     pop_front
#define vpii                    vector<pii>
#define umap                    unordered_map
#define all(x)                  x.begin(),x.end()
#define clr(a,b)                memset(a,b,sizeof a)
#define fr(i, n)                for(int i=0; i<n;++i)
#define fr1(i, n)               for(int i=1; i<=n; ++i)
#define rfr(i, n)			    for(int i=n-1; i>=0; --i)
#define precise(x)              cout<<fixed<<setprecision(x)
#define wh						while
#define mp						make_pair
#define le						length()
#define M						1000000007


void solve()
{
	float ans=6.28318530717958623200
;
float r;

cin>>r;
precise(6)<<ans*r<<endl;

}


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

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

#include <bits/stdc++.h>

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

void solve() {
    float r;
    cin >> r;
    float pi = 3.14159;
    float ans = (float)2 * pi * r;

    cout << fixed << setprecision(4) << ans << "\n";
}

int main() {
    // #ifndef ONLINE_JUDGE
    //     freopen("input.txt", "r", stdin);
    //     freopen("output.txt", "w", stdout);
    // #endif

    // std::ios_base::sync_with_stdio(false);
    // cin.tie(NULL);
    // cout.tie(NULL);
    // int t;
    // cin>>t;

    // while(t--)
    solve();

    return 0;
}

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

#include <iostream>
#include <cmath>

using namespace std;

double const PI = acos(-1);

int r;

int main() {
	// freopen("input.txt", "r", stdin);
	// freopen("output.txt", "w", stdout);

	cin >> r;

	cout << setprecision(10) << 2 * PI * r << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:17: error: 'setprecision' was not declared in this scope
   16 |         cout << setprecision(10) << 2 * PI * r << endl;
      |                 ^~~~~~~~~~~~
a.cc:3:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    2 | #include <cmath>
  +++ |+#include <iomanip>
    3 |
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class pre381
{
    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;
        }
    }

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


Compiler output:
Main.java:5: error: class pre381 is public, should be declared in a file named pre381.java
public class pre381
       ^
1 error
Language: Java

import java.math.*;
import java.util.Scanner;

public class Main1{
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);

        double R = scanner.nextInt();

        System.out.println(R * 2 * Math.PI);
    }
}

Compiler output:
Main.java:4: error: class Main1 is public, should be declared in a file named Main1.java
public class Main1{
       ^
1 error
Language: C

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

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

cout<<((2*3.14)*R)<<endl;
}

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

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

typedef long long int ll;

#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define endl "\n"

int main()
{
     fast;
	float r;
	float pi = 3.141592653
    cin>>r;
  	cout<<2*pi*r<<endl;
     return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: expected ',' or ';' before 'cin'
   14 |     cin>>r;
      |     ^~~
Language: C++

#include<iostream>
int R;
long c;
cin >> R;
c = 2 * R * 3.14159;
cout << c << endl;

Compiler output:
a.cc:4:1: error: 'cin' does not name a type
    4 | cin >> R;
      | ^~~
a.cc:5:1: error: 'c' does not name a type
    5 | c = 2 * R * 3.14159;
      | ^
a.cc:6:1: error: 'cout' does not name a type
    6 | cout << c << endl;
      | ^~~~
Language: C

#include<stdio.>
int main()
{
  int R;
  float C;
  scanf("%d",&R);
  C=2*pi*R;
  printf("%f",C);
  return 0;
}
  


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

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double pi=3.1415926535897932384626433832795;
    int r;
    double cr;
    cin>>r;
    cr=r*1.0*pi*2*1.0;
    printf("%.20lf\n",cr);
}


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 numpy as np #numpyをインポート
a=int(input())
pi = np.pi #変数piにnp.piを代入
b=a*pi
print(b)


Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import numpy as np #numpyをインポート
      | ^~~~~~
main.c:1:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'as'
    1 | import numpy as np #numpyをインポート
      |              ^~
main.c:1:14: error: unknown type name 'as'
main.c:1:20: error: stray '#' in program
    1 | import numpy as np #numpyをインポート
      |                    ^
main.c:3:12: error: stray '#' in program
    3 | pi = np.pi #変数piにnp.piを代入
      |            ^
Language: C

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

using namespace std;

int main()
{
    int r;
    double pi_2;
    cin >> r;
    cout << r * 2 * M_PI << endl;
    return 0;
}

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

#include<bits/stdc++.h> 

using namespace std;

#define ll long long int 
#define fon(n) for(ll i=0;i<n;i++)

int main(){

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

    ll t;
    cin>>t;

    cout<< fixed << setprecision(20)<<(double)(2*M_PI*(double)t);
	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
using namespace std;

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


Compiler output:
main.c:1:9: error: #include expects "FILENAME" or <FILENAME>
    1 | #include
      |         ^
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<<R*6.2830<<endl;
      |   ^~~~
main.c:7:19: error: 'endl' undeclared (first use in this function)
    7 |   cout<<R*6.2830<<endl;
      |                   ^~~~
Language: C++

#include<stdlib.h>
#include<assert.h>
#include<stdio.h>



#define ll long long
#define MAX_N 300001

/*
_
_._ _..._ . - ',     _.._(`))
'-. `     ' / -._. - '    ', /
)         \            '.
/ _    _ | \
| a    a    /              |
\   . - .;
'-('' ).-', '       ;
'-;           |      .'
\           \    /
| 7.__  _. - \   \
| |  |  ``/ / `  /
/, _|  |   /, _/   /
/, _ / '`-'
*/
using namespace std;





int main()
{
	int c;
	cin >> c;
	cout << 2 * 3.14159 * c;

}

		


Compiler output:
a.cc: In function 'int main()':
a.cc:35:9: error: 'cin' was not declared in this scope
   35 |         cin >> c;
      |         ^~~
a.cc:4:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    3 | #include<stdio.h>
  +++ |+#include <iostream>
    4 | 
a.cc:36:9: error: 'cout' was not declared in this scope
   36 |         cout << 2 * 3.14159 * c;
      |         ^~~~
a.cc:36:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
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:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'r'
    2 | r = int(input())
      | ^
Language: C

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

int main(){
	int r;
	float c;
	cin>>r;
	c=2*3.1415926535897932384626433832795*r;
	cout<<fixed<<setprecision(27)<<(float)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 <iostream>
#include <iomanip>
using namespace std;
const double PI = 3.141592653589793238460;

#define ll long long

int main(){

    ios::sync_with_stdio(false);
    cin.tie(0);
    
    int n;
    cin >> n;
    cout << setprecision(20) << 2*n*PI << "\n";

    return 0;
}

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

// !Start && !End 
//  0 se divide
//https: //www.youtube.com/watch?v=6Nb-prB-4P0&list=RD6Nb-prB-4P0&start_radio=1

// https: //www.youtube.com/watch?v=eYDI8b5Nn5s
// Electrify my OOOoooooOOOoooOOOOOoooooOOOooo!
#pragma optimise GCC(-O2)
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll,ll>
#define ve(x) vector<x>
#define f(a,b,c) for(int a=b;a<c;a++)
#define foto(x,v) for(auto x:v)
#define read(t) ll t; cin>>t;
#define reads(t) string t; cin>>t;
#define readarr(arr,n) ll arr[n]; f(i,0,n) cin>>arr[i];
#define forstl(i,v) for(auto &i: v)
#define ln endl
#define dbg(x) cout<<#x<<" = "<<x<<ln;
#define dbg2(x,y) cout<<#x<<" = "<<x<<" & "<<#y<<" = "<<y<<ln;
#define dbgstl(v) cout<<#v<<" = \n"; { int c=0; forstl(it,v) \
cout<<"    Term "<< ++c <<" = "<<it<<ln;} cout<<ln;
#define dbgstlp(v) cout<<#v<<" = \n"; { int c=0; forstl(it,v) \
cout<<"    Term "<< ++c <<" = "<<it.fi<<" , "<<it.se<<ln;} cout<<ln;
#define dbgarr(v,s,e) cout<<#v<<" = "; f(i,s,e) cout<<v[i]<<", "; cout<<ln;
#define addEdge(tr,k) f(i,0,k) { ll x,y; cin>>x>>y, tr[x].push_back(y), tr[y].push_back(x);}
#define all(v) v.begin(),v.end()

mt19937_64 rang(chrono::high_resolution_clock::now().time_since_epoch().count());
int rng(int lim) { uniform_int_distribution<int> uid(0, lim - 1); return uid(rang); }

//														GLOBAL VARS
ll INF =LLONG_MAX;
const ll M= 1000000007;

//														USEFUL FUNCTIONS
ll powm(ll ,ll);





// 														MAIN
int main()
{ 
	ios_base::sync_with_stdio(false);
    cin.tie(NULL);
	cout.tie(NULL);
    //It gets easier day by day, but the hard part is to........
    read(r)
    double pi = 3.14159265359;
    cout<<setprecision(18)<<2*pi*r;

}










//													FUNCTIONS DECLARATIONS
ll powm(ll a, ll b) {
	ll res=1;
	while(b) {
		if(b&1)
			res=(res*a)%M;
		a=(a*a)%M;
		b>>=1;
	}
	return res;
}


Compiler output:
main.c:8:9: fatal error: bits/stdc++.h: No such file or directory
    8 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define vi vector<int>
#define vll vector<ll>
#define all(a) a.begin(),a.end()
#define mp(a,b) make_pair(a,b)
#define pb push_back
#define mod 1000000007
#define ft cout<<"for test"<<endl;
#define pi 2*acos(0.0)
int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    double r;
    cin>>r;
    cout<<2*pi*r<<endl;

}


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

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

int main()
{
    int r;
    cin >> r;
    double ans = 2 * r * M_PI;
    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>
#define mp make_pair
#define pr pair<ll,ll>
#define MAX 1000000
#define ed '\n'
using namespace std;
typedef long long int ll;
#define mod 998244353
double pi=3.14159265358979323846;
void sync(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
}

int main(){
	sync();
	ll t;
	t=1;
	for(ll testcase=1;testcase<=t;testcase++){
	ll r;
	cin>>r;
	double area=2*pi*r;
	cout<<fixed<<setprecision(20)<<area<<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: Java

import java.util.Scanner;
public class Circumference{
public static void main (String[] args) {
float R ;
System.out.println(2*pi*R);
}
}

Compiler output:
Main.java:2: error: class Circumference is public, should be declared in a file named Circumference.java
public class Circumference{
       ^
Main.java:5: error: cannot find symbol
System.out.println(2*pi*R);
                     ^
  symbol:   variable pi
  location: class Circumference
2 errors
Language: C

#include <iostream>
#include <vector>
#include <string>
#include <cctype>
#include <cmath>
#include <iomanip>
#include <climits>
#include <cfloat>
#include <algorithm>
#include <memory>
using namespace std; 

typedef long long ll; 
typedef unsigned long long ull;
typedef unsigned uint; 
typedef long double l_double;

#define vtr vector
#define PB push_back
#define EB emplace_back
#define gcd __gcd
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define st_ct static_cast // <>
#define TEST uint _ {}; cin >> _; while (_--)
#define PI (3.1415926535897932384626433832795)
#define MOD st_ct<int>(1e9 + 7)
#define EPS 1e-9
#define deb(x) cout<< #x << " --> " << x << endl;

template<typename T>
void vtrS(const vector<T> &ARR) 
{ for (T const &val: ARR) cout<<val<<" "; cout<<endl; }

template<typename T>
void vtrV(const vector<T> &ARR) 
{ for (T const &val: ARR) cout<<val<<endl; }

template<typename T>
void read_vvtr(vector<vector<T>> &ARR) 
{ for (vector<T> &i: ARR) for (T &j: i) cin >> j; }

template<typename T>
void vvtrS(const vector<vector<T>> &ARR) 
{ for (vector<T> const &i: ARR) { for (T const &j: i) cout<<j<<" "; cout<<endl; } }

template<typename T>
void vvtrNS(const vector<vector<T>> &ARR) 
{ for (vector<T> const &i: ARR) { for (T const &j: i) cout<<j; cout<<endl; } }

template<typename T>
T cntDigits(const T &N) { return (floor(log10(N)) + 1); }

template<typename T>
bool isPowOfTwo(const T &N) { return (N && (!(N&(N-1)))); }

template<typename T>
T lcm(T a, T b) { return ((a*b)/gcd(a, b)); }
// --------------------------------------------------------------------------------

//

int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    // cout.setf(std::ios::boolalpha);
    cout<<std::fixed<<std::setprecision(20); 
    // --------------------------------------
    
    double r {};
    cin >> r;
    cout<<(2 * PI) * r<<endl;
    return 0;
}

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

#include <iostream>
#include <cmath>

using namespace std;

double const PI = acos(-1);

int r;

int main() {
	// freopen("input.txt", "r", stdin);
	// freopen("output.txt", "w", stdout);

	cin >> r;

	cout << setprecision(10) << 2 * PI * r << 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;
  double L;
  L = 2 * R * 3.141592;


  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

#include <iostream>
#include <stack>
#include <math.h>
#include <vector>
#include <algorithm>

#define rep(i,n) for(int i=0; i < n; i++)
using namespace std;
#define PI 3.14159265358979

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

    cout << 2* r * 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;
double pie=3.14159265;
cin>>R;

cout<<2*R*pie<<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 <cmath>
#include <iostream>
#include <map>
#include <string>
using namespace std;
const double PI = 3.1415926535897932;
int main() {
  int r = 0;
  cin >> r;
  double res = PI * 2 * r;
  cout << res << endl;
  return 0;
}

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

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

#define ll long long int
#define pb push_back
#define fi first
#define se second
#define mp make_pair
#define mt make_tuple
#define all(A) A.begin(), A.end()
#define sz(A) (int)A.size()
typedef vector <int> vi;
typedef vector <ll> vl;
typedef pair <int, int> pii;
const ll mod = 1e9 + 7;
//const ll mod = 998244353;
const int inf = 1e9;
//const ll inf = 1e18;
const int N = 2e5;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	long double pi = 3.14;
	long double r;
	cin >> r;
	cout << 2 * 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(){
  double r,a;
  cin >> r;
  a=2*r*3.141592
  
  cout << fixed << setprecision(7) << a << endl;
  return 0;  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: expected ';' before 'cout'
    7 |   a=2*r*3.141592
      |                 ^
      |                 ;
    8 | 
    9 |   cout << fixed << setprecision(7) << a << endl;
      |   ~~~~
Language: C

#define _USE_MATH_DEFINES

#include <bits/stdc++.h>

using namespace std;

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

int main () {
  solve();
  return 0;
}


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

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

#define ll long long
//#define bint int1024_t
#define ld long double
#define vect vector<ll>
#define unmap unordered_map
#define pb push_back
#define pi 3.1415926536
#define mod int(1e9+7)
#define mp make_pair
//ios_base::sync_with_stdio(false);cin.tie(NULL);
#define testcases ll t; cin>>t; while(t--)

using namespace std;
//using namespace boost::multiprecision;
//using namespace __gnu_pbds;

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

    // int k=0;
    // testcases
    // {
        

    //     cout<<"Case #"<<++k<<": "<<ans<<"\n";
    // }

    double r;
    cin>>r;
    cout<<setprecision(10)<<fixed<<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: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class Main{
  public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        System.out.println(2 * Double.parseInt(bf.readLine()) * Math.PI);
    }
}

Compiler output:
Main.java:7: error: cannot find symbol
        System.out.println(2 * Double.parseInt(bf.readLine()) * Math.PI);
                                     ^
  symbol:   method parseInt(String)
  location: class Double
1 error
Language: C

#include <iostream>

using namespace std;

int main () 
{
  int a;
  cin >> a;
  a *= 3.14159; a *= 2;
  cout << a << '\n';
  }


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

#include<iostream.h>
using namespace std;
int main()
{
  float R;
  cin>>R;
  double C = 2*R*3.14159;
  cout<<C;
  return 0;
}

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

#include<bits/stdc++.h>
using namespace std
int main(){
int r;
cin>>r;
cout<<22/7*2*r;
}

Compiler output:
a.cc:2:20: error: expected ';' before 'int'
    2 | using namespace std
      |                    ^
      |                    ;
    3 | int main(){
      | ~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
int main(void){
    int R;
    cin >> R;
    cout << 2*R*3.14159265363116 << 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 <stdio.h>
#include <algorithm>
#define rep(i,n) for(int i=0; i<n; ++i)
using name space std;

int main(){
    double pi = 3.1415;
    double r;
    cin >> r;
    
    double ans;
    ans = 2 * pi * r;

    cout << 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

r = int(input)

import math

print(2.0*math.pi*r)


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)
      |     ^~~