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

#include<iostream> 
#include<algorithm> 
#include<vector> 
using namespace std; 
#define PI acos(-1)
//const double PI =  3.1415926;
int main() 
{ 
	int n;
	cin>>n;
	//cout<<2*n*PI<<"\n";
	printf("%.20lf\n",2*n*PI);
} 


Compiler output:
a.cc: In function 'int main()':
a.cc:5:12: error: 'acos' was not declared in this scope
    5 | #define PI acos(-1)
      |            ^~~~
a.cc:12:31: note: in expansion of macro 'PI'
   12 |         printf("%.20lf\n",2*n*PI);
      |                               ^~
Language: C++

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

int main() {
  rep(i, 3) {
    double N,s;
    cin>>N;
    s=3.1415*N;
    cot<<fixed<<setprecision(4);
    cout << s << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'cot' was not declared in this scope; did you mean 'cos'?
   10 |     cot<<fixed<<setprecision(4);
      |     ^~~
      |     cos
Language: Java

import java.util.Scanner;
public class Circumference {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
Scanner sc = new Scanner (System.in);
float pi=0;
int R=0;
 R = sc.nextInt();
float Circumference = sc.nextFloat();
Circumference = 2 * pi * R;
System.out.println(Circumference  );
	}


	}




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

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

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


int main() {
	const double PI = 3.14159265358979323846;
	double R;
	cin >> R;
	cout << fixed << setprecision(8) << R * 2 * PI << endl;
}


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

R = int(input())
ret = R * 3.1415 * 2
print(ret)

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

#include <bits/stdc++.h>

using namespace std;

int main() {

    double x;
    cin >> x;
    cout << (x * 6.28318530717958623200);

    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()
{
    float pi=3.14159263a;
    double a;
    int r;
    scanf("%d",&r);
    a=2*pi*r;
    printf("%.20f",a);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: unable to find numeric literal operator 'operator""a'
    7 |     float pi=3.14159263a;
      |              ^~~~~~~~~~~
Language: C

import math

x = int(input())

print(2 * x * 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 'x'
    3 | x = int(input())
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace
  
  int main(){

 int R;
 cin >> R ;
  cout << 6.282*R << endl;
  
}

Compiler output:
a.cc:4:3: error: expected identifier before 'int'
    4 |   int main(){
      |   ^~~
a.cc:2:16: error: expected ';' before 'int'
    2 | using namespace
      |                ^
      |                ;
    3 | 
    4 |   int main(){
      |   ~~~           
a.cc: In function 'int main()':
a.cc:7:2: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |  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:8:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   cout << 6.282*R << endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:8:22: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    8 |   cout << 6.282*R << endl;
      |                      ^~~~
      |                      std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C

#include <iostream>

void funcA() {
 
  int r;
  std::cin >> r;
  std::cout << (float)(r*3.1415);

}

int main(void) {
  funcA();
  return 0;
}

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

public static void main() {
        Scanner sc = new Scanner(System.in);
        int R = sc.nextInt();
    
        double circumference;
        double PI = 3.14159265;
        circumference = 2 * PI * R;
        System.out.println(circumference);
}

Compiler output:
Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
public static void main() {
              ^
  (use --enable-preview to enable unnamed classes)
1 error
Language: C++

#line 2 "template.hpp"
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using pl = pair<ll, ll>;
using vl = vector<ll>;
#define rep(i, n) for(ll i = 0; i < (ll)n; i++)
#define rep3(i, l, r) for(ll i = l; i < (ll)r; i++)
#define per(i, n) for(ll i = (ll)n-1; i >= 0; i--)
#define per3(i, l, r) for(ll i = (ll)r-1; i >= (ll)l; i--)
#define all(v) begin(v), end(v)
template<class T, class U> inline void cmax(T& a, U b) { if (a < b) a = b; }
template<class T, class U> inline void cmin(T& a, U b) { if (a > b) a = b; }

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr); ios::sync_with_stdio(false);
    cout << fixed << setprecision(15); cerr << fixed << setprecision(15);
  }
} io_setup;

constexpr char el = '\n';
template<class T, class U> ostream &operator<<(ostream &os, const pair<T, U>& p) { os << p.first << " " << p.second; return os; }
template<class T, class U> istream &operator>>(istream &is, pair<T, U> &p) { is >> p.first >> p.second; return is; }
template<class T> ostream &operator<<(ostream &os, const vector< T > &v) { rep(i, v.size()) os << v[i] << (i + 1 != v.size() ? " " : ""); return os; }
template<class T> istream &operator>>(istream &is, vector< T > &v) { for(T &in : v) is >> in; return is; }


Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: Java

import java.util.Scanner;
public class Main {
    public static void main() {
        Scanner sc = new Scanner(System.in);
        int R = sc.nextInt();
    
        double circumference;
        double PI = 3.14159265
        circumference = 2 * PI * R;
        System.out.println(circumference);
    }
}

Compiler output:
Main.java:8: error: ';' expected
        double PI = 3.14159265
                              ^
1 error
Language: C

import java.util.Scanner;
public class Main {
    public static void main() {
        Scanner sc = new Scanner(System.in);
        int R = sc.nextInt();
    
        double circumference;
        double PI = 3.14159265
        circumference = 2 * PI * R;
        System.out.println(circumference);
    }
}

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.Scanner;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.Scanner;
      |            ^
main.c:2:1: error: unknown type name 'public'
    2 | public class Main {
      | ^~~~~~
main.c:2:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Main'
    2 | public class Main {
      |              ^~~~
Language: C

#include "bits/stdc++.h"
using namespace std;
typedef long long ll;

int a,b,c;
string s;

int main()
{

    ios::sync_with_stdio(false);
    cin.tie(0);
    
    cin>>a;
    const double pi=3.14159;

    double ans=(double) 2*pi*a;
    printf("%.6f",ans);
    
    
	
	
}







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.Scanner;

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


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

#include <bits/stdc++.h>
using namespace std;
 
#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define endl "\n"
#define ll long long
#define watch(x) cout << (#x) << " is " << (x) << endl

typedef vector<int> vi;
typedef vector< vi > vvi;
typedef pair< int,int > ii;
typedef pair< double,double> dd;
#define pb push_back
#define eb emplace_back
#define sz(a) (int)a.size()
#define all(c) c.begin(),c.end()
#define FOR(i,a,b) for(i=a; i<b; i++)
#define FORR(i,a,b) for(i=a;i>=b;i--)
#define REP(i,n) FOR(i,0,n)
#define x first
#define y second
#define mp make_pair

const int INF = 1000000007;
const long long INFLL = (ll)INF * (ll)INF;

int32_t main()
{
	IOS;
	int r;
	double circum;
	cin>>r;
	circum = 2 * 3.1415926535 * r;
	cout<<circum;
	return 0;
}


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

#include<iostream>
using namespace std;
int main(){
  int R,A;
  cin>> R;
  A=R*2*3.14159265358979323846;
  cout<< A <<endl;
  return 0;
}

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

import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    int r = scan.nextInt();
    double n = r*2*3.14;
    println(n);
  }
}


Compiler output:
Main.java:8: error: cannot find symbol
    println(n);
    ^
  symbol:   method println(double)
  location: class Main
1 error
Language: C++

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

int main() {
  rep(i, 3) {
    double N,s;
    cin>>N;
    s=3.1415*N
    cout << s << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:15: error: expected ';' before 'cout'
    9 |     s=3.1415*N
      |               ^
      |               ;
   10 |     cout << s << endl;
      |     ~~~~
Language: C

#include <bits/stdc++.h>

using namespace std;

const double PI  = 3.141592653589793238463;

int main() {
	double x;
  	cin >> x;
  	cout << x * 2.0 * PI;
    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 rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
  rep(i, 3) {
    double N;
    cin>>N;
    s=3.1415*N
    cout << s << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: 's' was not declared in this scope
    9 |     s=3.1415*N
      |     ^
Language: C

#include <bits/stdc++.h>
using namespace std;
int main(){
  double a;
  cin>>a;
  double pie=3.14;
  cout<<a*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 <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
  rep(i, 3) {
    double N;
    cin>>N;
    s=3.1415*N
    cout << s << endl;
  }
}


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

import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    int r = scan.nextInt();
    double n = r*2*3.14;
    println(n);
  }
}


Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.Scanner;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.Scanner;
      |            ^
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++

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
int main(){
  ll r ;
  cin>> r;
  long long double pi = 3.14159265358979323846;
  cout<< 2*pi*r;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: 'long long' specified with 'double'
    7 |   long long double pi = 3.14159265358979323846;
      |        ^~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int R;
  cin >> R;
  
  int count = R * 2 * 3.14159265358979;
 
  cout << count << endl;
}

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

#include<stdio.h>
#include<math.h>
int main()
{
    double r, ans;
    scanf("%lf", &r);
    ans = acos(-1) * r * 2;
    printf("%lf\n", ans);
    return 0;
}


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Compiler output:
a.cc:13:1: error: 'Chat' does not name a type
   13 | Chat Conversation End
      | ^~~~
Language: C

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

const long double PI = acos(-1);

void solve() 
{
    double r;cin>>r;cout<<setprecision(20)<<2*PI*r<<endl;
}

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

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

#include <bits/stdc++.h>

using namespace std;

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

int main(void){
    long double n;
    cin >> n;
    cout << M_PI*(2*n) << endl;
}

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

#include<bits/stdc++.h>
using namespace std;
double n;
const double P=3.1415926535897932384626433832795028841971693993;
int main(){
	cin>>n;
	printf("%.20lf",2*n*P);
	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>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;

const double PI=3.14159265358979323846;

int main() {

    double r;
    cin >> r;
    double ans;
    ans = 2 * PI * r;
    printf("%.10f", ans);
    return 0;
}

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

#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
const int mod = 1e9 + 7;
//const int mod = 998244353;
const ll infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;
void YesNo(bool j){cout << (j ? "Yes" : "No") << endl; return;}
void yesno(bool j){cout << (j ? "yes" : "no") << endl; return;}
template<class Head> void pt(Head&& head){cout << head << endl; return;}


int main() {
  int n;
  cin >> n;
  double a=2*n*3.1415926;
  cout << a << 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(){
  double pi = 3.14159265359;
  double r;
  cin>>r;
  cout<<r*pi*2;
}

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

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

// Optimization

//#pragma GCC optimize("O3")
#define endl '\n'

// Shortcut

#define int long long
#define eb emplace_back
#define pb push_back
#define pob pop_back
#define mp make_pair
#define upb upper_bound
#define lwb lower_bound
#define fi first
#define se second
#define For(i, l, r) for (int i = l; i < r; i++)
#define ForE(i, l, r) for (int i = l; i <= r; i++)
#define Ford(i, r, l) for (int i = r; i > l; i--)
#define FordE(i, r, l) for (int i = r; i >= l; i--)
#define Fora(i, a) for (auto i : a)

// I/O & Debug

#define PrintV(a) Fora(iiii, a) cout << iiii << ' '; cout << endl;
#define PrintVl(a) Fora(iiii, a) cout << iiii << endl;
#define PrintA(a, l, r) for (int iiii = l; iiii <= r; iiii++) cout << a[iiii] << ' '; cout << endl;
#define PrintAl(a, l, r) for (int iiii = l; iiii <= r; iiii++) cout << a[iiii] << endl;
#define Ptest(x) return cout << x, 0;
#define gl(s) getline(cin, s);
#define setpre(x) fixed << setprecision(x)
/*
#define debug(args...){ string _sDEB = #args; replace(_sDEB.begin(), _sDEB.end(), ',', ' '); stringstream _ssDEB(_sDEB); istream_iterator<string> _itDEB(_ssDEB); DEB(_itDEB, args); }
void DEB(istream_iterator<string> it) {}
template<typename T, typename... Args>
void DEB(istream_iterator<string> it, T a, Args... args){
    cout << *it << " = " << a << endl;
    DEB(++it, args...);
}
*/

// Functions

//#define isvowel(a) (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
#define bend(a) a.begin(), a.end()
#define rbend(a) a.rbegin(), a.rend()
#define mset(a) memset(a, 0, sizeof(a))
#define mset1(a) memset(a, 1, sizeof(a))
#define msetn1(a) memset(a, -1, sizeof(a))
#define msetinf(a) memset(a, 0x3f, sizeof(a))
#define gcd __gcd
#define __builtin_popcount __builtin_popcountll
//mt19937 rando(chrono::steady_clock::now().time_since_epoch().count());

// Data Structure

#define pque priority_queue
#define mts multiset
#define y0 _y0_
#define y1 _y1_
#define div divi
typedef long long ll;
typedef long double ld;
typedef vector <int> vi;
typedef vector <ll> vll;
typedef vector <ld> vld;
typedef vector <string> vs;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
typedef vector <vi > vvi;
typedef vector <vll > vvll;
typedef vector <pii > vpii;
typedef vector <pll > vpll;

const int N = 1e5 + 5, mod = 1e9 + 7, mod1 = 998244353, mod2 = 1e9 + 9, inf = 1e18 + 7;
const ll infll = 1e18 + 7;

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n; cin >> n; n *= 2;
    ld ans = 3.14159265358 * n;
    cout << setpre(6) << ans;
}

/*
==================================+
INPUT:                            |
------------------------------    |

------------------------------    |
==================================+
OUTPUT:                           |
------------------------------    |

------------------------------    |
==================================+
*/

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

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

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <string>
#include <algorithm>
#include <cmath>
using namespace std;
double a=0.28318530717958623200;
double ans1;
int ans2,k;
int tt,x;
int main() 
{
	scanf("%d",&x);
	ans1=x*a;
	k=ans1;
	ans2=6*x+k;
	tt=ans2%10;
	ans1=ans1-k+tt;
	ans2=(ans2-tt)/10;
	if(ans2>=10)
		printf("%d%.20llf",ans2,ans1);
	else
		printf("%.20llf",ans1);
	return 0;
}

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

int main()
{
    float n;
    cin >> n;
    cout << 2*(22/7)*n << endl;    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:5: error: 'cin' was not declared in this scope
    4 |     cin >> n;
      |     ^~~
a.cc:5:5: error: 'cout' was not declared in this scope
    5 |     cout << 2*(22/7)*n << endl;
      |     ^~~~
a.cc:5:27: error: 'endl' was not declared in this scope
    5 |     cout << 2*(22/7)*n << endl;
      |                           ^~~~
Language: C++

#include<iostream>
#include<cmath>
#define cs ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
typedef long double ld;

using namespace std;

int main(){
    cs
    ld x;
    cin>>x;
    cout<<fixed<<setprecision(12)<<2*x*acos(-1);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:18: error: 'setprecision' was not declared in this scope
   12 |     cout<<fixed<<setprecision(12)<<2*x*acos(-1);
      |                  ^~~~~~~~~~~~
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 | #define cs ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
Language: C

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vb=vector<bool>;
using vvb=vector<vb>;
using vd=vector<double>;
using vvd=vector<vd>;
using vi=vector<int>;
using vvi=vector<vi>;
using vl=vector<ll>;
using vvl=vector<vl>;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll>;
using tlll=tuple<ll,ll,ll>;
using vs=vector<string>;
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define rep(i,n) range(i,0,n)
#define rrep(i,n) for(ll i=((ll)n)-1;i>=0;i--)
#define range(i,a,n) for(ll i=((ll)a);i<((ll)n);i++)
#define LINF ((ll)1ll<<60)
#define INF ((int)1<<30)
#define EPS (1e-9)
#define MOD (1000000007ll)
#define fcout(a) cout<<setprecision(a)<<fixed
#define fs first
#define sc second
#define PI (3.1415926535897932384)

int dx[]={1,0,-1,0,1,-1,-1,1},dy[]={0,1,0,-1,1,1,-1,-1};
template<class T>bool chmax(T&a,T b){if(a<b){a=b; return true;}return false;}
template<class T>bool chmin(T&a,T b){if(a>b){a=b; return true;}return false;}
template<class S>S sum(vector<S>&a){return accumulate(all(a),S());}
template<class S>S max(vector<S>&a){return *max_element(all(a));}
template<class S>S min(vector<S>&a){return *min_element(all(a));}
ll max(int a,ll b){return max((ll)a,b);} ll max(ll a,int b){return max(a,(ll)b);}
int sgn(const double&r){return (r>EPS)-(r<-EPS);} // a>0  : sgn(a)>0
int sgn(const double&a,const double&b){return sgn(a-b);} // b<=c : sgn(b,c)<=0

template<class T>void puta(T&&t){cout<<t<<"\n";}
template<class H,class...T>void puta(H&&h,T&&...t){cout<<h<<' ';puta(t...);}
template<class S,class T>void tf(bool b,S t,T f){if(b)puta(t);else puta(f);}
void YN(bool b){tf(b,"YES","NO");}
void Yn(bool b){tf(b,"Yes","No");}
void yn(bool b){tf(b,"yes","no");}
template<class S,class T>ostream&operator<<(ostream&os,pair<S,T>p){os<<"["<<p.first<<", "<<p.second<<"]";return os;};
template<class S>auto&operator<<(ostream&os,vector<S>t){bool a=1;for(auto s:t){os<<(a?"":" ")<<s;a=0;}return os;}
template<class S>auto&operator>>(istream&is,vector<S>&t){for(S&a:t)cin>>a;return is;}

/*他のライブラリを入れる場所*/


int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll n;
    cin>>n;
    fcout(10)<<(n*2*PI)<<endl;;
    return 0;
}

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

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


using namespace std;


int main()
{
     int R;
    
    cin>>R;
    
    
    float result = 2*M_PI*R;
    
    cout<<result;
    
     
    
    return 0;
}#include <bits/stdc++.h>
#include <vector>
#include <cmath>


using namespace std;


int main()
{
     int R;
    
    cin>>R;
    
    
    float result = 2*M_PI*R;
    
    cout<<result;

    return 0;
}

Compiler output:
a.cc:23:2: error: stray '#' in program
   23 | }#include <bits/stdc++.h>
      |  ^
a.cc:23:3: error: 'include' does not name a type
   23 | }#include <bits/stdc++.h>
      |   ^~~~~~~
a.cc:31:5: error: redefinition of 'int main()'
   31 | int main()
      |     ^~~~
a.cc:9:5: note: 'int main()' previously defined here
    9 | int main()
      |     ^~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int R;
  cin >> R;
 
  cout << R * 2 * 3.14159265358979 << endl;
}

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

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); i++)
#define repd(i,a,b) for (int i = (a); i < (b); i++)
#define INF LLONG_MAX
#define mod 1000000007
typedef long long ll;
int main(void)
{
	double R;
	double ans = 2*R*`M_PI;
	cout << ans << endl;
	return 0;
}


Compiler output:
a.cc:11:26: error: stray '`' in program
   11 |         double ans = 2*R*`M_PI;
      |                          ^
Language: C

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

  cout << input * 2 * M_PI << endl;

  return 0;
}


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

int main(){
  double pi = 3.14159265359;
  double r;
  cin>>r;
  cout<<r*pi*2;
}

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

#include <iostream>
using namespace std;

int main()
{
	int r;
	double  a;
	cin>>r;
	a=2*3.1416*r;
	cout<<a<<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 COUT(x) cout<<(x)<<endl
    typedef long long ll;
    template<class T> inline void chmax(T& a, T b) {
      if (a < b) a = b;
    }
     
    template<class T> inline void chmin(T& a, T b) {
      if (a > b) a = b;
    }
     
    const long long INF = 1LL << 60;
    int main() {
      int r;
      cin >> r;
      const double pi = 3.1415926535;
      double leng = 2 * pi * r;
      cout << leng << endl;
      return 0;
     
    }

Compiler output:
main.c:1:14: fatal error: bits/stdc++.h: No such file or directory
    1 |     #include <bits/stdc++.h>
      |              ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
int main() {
    int r;
    double l;
    cin >> r;
    l = 2 * M_PI * r;
    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 << fixed;
  cout << setprecision(4) << 2*R*3.141592 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: 'setprecision' was not declared in this scope
    7 |   cout << setprecision(4) << 2*R*3.141592 << endl;
      |           ^~~~~~~~~~~~
a.cc:2:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    1 | #include<iostream>
  +++ |+#include <iomanip>
    2 | using namespace std;
Language: Java

public class Main {

    static double circumference(double r){
        double PI = 3.1415926535897932384626433832795;
        double cir = 2*PI*r;
        return cir;
    }
    public static void main (String[] args) {
        Scanner scanner = new Scanner(System.in);
        double r = scanner.nextDouble();
        double result = Math.round(circumference(r) * 1000) / 1000.0;
        System.out.println("Circumference = "+ result);
    }
}





Compiler output:
Main.java:9: error: cannot find symbol
        Scanner scanner = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:9: error: cannot find symbol
        Scanner scanner = new Scanner(System.in);
                              ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C

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

int main() {
  int R;
  cin >> R;
  
  cout << (R * 2) * (7 /22) << 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 * 3.1415 << 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 << fixed;
  cout << setprecision(4) << 2*R*3.141592 << endl;
}

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

#include<iostream>
#include<cmath>
#define cs ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
typedef long double ld;

using namespace std;

int main(){
    cs
    ld x;
    cin>>x;
    cout<<fixed<<setprecision(12)<<2*x*acos(-1);
}

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;
 
  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

import java.util.Scanner;
public class Atcoder1
{
    void main()
    {
        Scanner sc=new Scanner (System.in);
        int r=sc.nextInt();
        double c=Math.PI*r;
        System.out.println(c);
    }
}

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.Scanner;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.Scanner;
      |            ^
main.c:2:1: error: unknown type name 'public'
    2 | public class Atcoder1
      | ^~~~~~
main.c:2:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Atcoder1'
    2 | public class Atcoder1
      |              ^~~~~~~~
Language: C++

#include <stdio.h>
void draw()
{
int R;
int S;
  cin >> R;
  S = ( R + R ) * 3.14;
  cout << S;  
}

Compiler output:
a.cc: In function 'void draw()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> R;
      |   ^~~
a.cc:8:3: error: 'cout' was not declared in this scope
    8 |   cout << S;
      |   ^~~~
Language: C

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

int main()
{

int R;
cin>>R;  
   
cout<<R*2*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 <iostream>
#include <vector>
#include <string>
#include "./libb/lib.hpp"

using namespace std;

int main()
{
    uint32_t rr;
    double pi = 3.141592;
    cin >> rr;

    cout << 2 * rr * pi << endl;

    return 0;
}

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

#include <bits/stdc++.h>

using namespace std;

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


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

#include<stdio.h>
#include<math.h>
int main(void){
  double r,a;
  scanf("%lf", &r);
  a=r*2*M_PI;
  printf("%lf", a);
  return 0
}


Compiler output:
main.c: In function 'main':
main.c:8:11: error: expected ';' before '}' token
    8 |   return 0
      |           ^
      |           ;
    9 | }
      | ~
Language: C

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

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

	const auto circumference = 2 * radius * acos(-1);

	cout << circumference;

	return 0;
}



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

import java.util.Scanner;
import java.lang.Math;
public class MyClass {
    public static void main(String args[]) {
      Scanner scan = new Scanner(System.in);
      double r = scan.nextDouble();
      System.out.printf("%.20f",2*Math.PI*r);
    }
}

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

#include<bits/stdc++.h>
using namespace std;
int main(void){
  int R;
  cin>>R;
  cout<<2*R*3.14<<endl; 
  return 0;
}

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

#include<stdio.h>
#include<math.h>
int main(void){
  double r;
  scanf("%lf", &r);
  a=r*2*M_PI;
  printf("%lf", a);
  return 0
}


Compiler output:
main.c: In function 'main':
main.c:6:3: error: 'a' undeclared (first use in this function)
    6 |   a=r*2*M_PI;
      |   ^
main.c:6:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:11: error: expected ';' before '}' token
    8 |   return 0
      |           ^
      |           ;
    9 | }
      | ~
Language: C++

#include <iostream>

using namespace std;

void rec (char s[], int l)
{
    
    
}
int main() {
	
   double n;
   cin>>n;
   cout<<setprecision(20);
   double m=(44*n)/7;
  cout<<m;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:10: error: 'setprecision' was not declared in this scope
   14 |    cout<<setprecision(20);
      |          ^~~~~~~~~~~~
a.cc:2:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    1 | #include <iostream>
  +++ |+#include <iomanip>
    2 |
Language: C++

#include <stdio.h>
void draw()
{
int R;
int S;
  cin >> R;
  S = ( R + R ) * 3.14;
  cout << S;  
  return 0;
}

Compiler output:
a.cc: In function 'void draw()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> R;
      |   ^~~
a.cc:8:3: error: 'cout' was not declared in this scope
    8 |   cout << S;
      |   ^~~~
a.cc:9:10: error: return-statement with a value, in function returning 'void' [-fpermissive]
    9 |   return 0;
      |          ^
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.function.DoubleToIntFunction;

public class Main2 {
    public static void main(String[] args) {

        // Listに標準入力の値を取得
        LinkedList<String> scList = new LinkedList<>();
        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
            while (br.ready()) {
                String[] lineArray = br.readLine().split(" ");
                Arrays.<String>stream(lineArray).forEach(s -> scList.add(s.trim()));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        double r = Double.parseDouble(scList.pop());
        System.out.println(r*Math.PI*2);
    }
}

Compiler output:
Main.java:8: error: class Main2 is public, should be declared in a file named Main2.java
public class Main2 {
       ^
1 error
Language: C

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

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    long double r;cin>>r;
    cout<<fixed<<setprecision(18)<<2.0*3.14159265358979323846*r<<"\n";
}


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

#include<stdio.h>
#include<math.h>
int main(void){
  double r;
  scanf("%lf", &r);
  a=r*2*M_Pi;
  printf("%lf", a);
  return 0
}

Compiler output:
main.c: In function 'main':
main.c:6:3: error: 'a' undeclared (first use in this function)
    6 |   a=r*2*M_Pi;
      |   ^
main.c:6:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:6:9: error: 'M_Pi' undeclared (first use in this function); did you mean 'M_PI'?
    6 |   a=r*2*M_Pi;
      |         ^~~~
      |         M_PI
main.c:8:11: error: expected ';' before '}' token
    8 |   return 0
      |           ^
      |           ;
    9 | }
      | ~
Language: Java

import java.util.Scanner;
import java.lang.Math;
public class MyClass {
    public static void main(String args[]) {
      Scanner scan = new Scanner(System.in);
      int r = scan.nextInt();
      System.out.printf("%.20f",2*Math.PI*r);
    }
}

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

#include <bits/stdc++.h>
using namespace std;
 
int main() {
 
  int 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 <iostream>
#include <string>
#include <vector>

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

using namespace std;

int main(void){

    //input
    int R;
    cin >> R;

    //output
    int arc = 0;

    cout<< 2*R*3.14;
    
    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 cos(0.0);
int main()
{           int r;
   double  pi=3.1416;
         cin>>r;
         cout<<2*pi*(double)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>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
#define endl '\n'
#define maxl __LONG_LONG_MAX__
#define pb push_back
#define F first
#define S second
#define mp make_pair
#define rep(i, n) for(int i = 0; i < n; i++)
#define rev(i, n) for(int i = n-1; i >= 0; i--)
#define rep1(i, n) for(int i=1; i < n; i++)
#define rev1(i, n) for(int i=n ; i > 0; i--)
#define FOR(i, a, b) for(int i=a ; i < b; i++)
#define trace(x)                 cerr << #x << ": " << x << endl;
#define trace2(x, y)             cerr << #x << ": " << x << " | " << #y << ": " << y << endl;
#define trace3(x, y, z)          cerr << #x << ": " << x << " | " << #y << ": " << y << " | " << #z << ": " << z << endl;
#define trace4(a, b, c, d)       cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << endl;
#define n_ones(x) __builtin_popcountll(x)
#define n_trailzero(x) __builtin_ctzll(x)
#define n_leadingzero(x) __builtin_clz(x)
#define sz(a) (ll)(a.size())
#define all(v) v.begin(),v.end()

typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef vector<ll> vll;
typedef vector<pair<ll, ll>> vpll;
typedef vector<vector<ll>> vvll;
typedef stack<ll> stk;
typedef queue<ll> que;

typedef tree<int,null_type,less<int>,rb_tree_tag,
tree_order_statistics_node_update> indexed_setll;
typedef tree<char,null_type,less<char>,rb_tree_tag,
tree_order_statistics_node_update> indexed_setc;

ll max(int a,ll b){ return max((ll)a,b);}
ll min(int a,ll b){ return min((ll)a,b);} 
ll min(ll a,int b){ return min(a,(ll)b);}
ll max(ll a,int b){ return max(a,(ll)b);}

ll mod = 1e9 + 7;
ld PI = 3.14159265358979;
void solve()
{	
	ld r;
	cin>>r;
	cout<<setprecision(9)<<2 * PI * r<<endl;
	return;
}

int main()
{
	ios_base::sync_with_stdio(false); 
    cin.tie(NULL);
    cout.tie(NULL);
	ll t = 1;
	//cin>>t;
	rep(i, t)
		solve();
	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.util.Scanner;
public class Circumference{
public static void main (String args[]);
Scanner sc = new Scanner (System.in);
int R = sc.nextInt();
Circumference = 2 * pi *  R;
System.out.println (Circumference of circle);
}
}


Compiler output:
Main.java:6: error: <identifier> expected
Circumference = 2 * pi *  R;
             ^
Main.java:7: error: <identifier> expected
System.out.println (Circumference of circle);
                  ^
Main.java:7: error: ',', ')', or '[' expected
System.out.println (Circumference of circle);
                                    ^
Main.java:9: error: class, interface, enum, or record expected
}
^
4 errors
Language: C++

#include <iostream>
#include<cmath>
#include<algorithm>
using namespace std;

int n, m, k;



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


	cout << fixed << setprecision(4) <<  2.0 * 3.14159 * r << endl;
//	return 0;
	system("pause");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:26: error: 'setprecision' was not declared in this scope
   16 |         cout << fixed << setprecision(4) <<  2.0 * 3.14159 * r << endl;
      |                          ^~~~~~~~~~~~
a.cc:4:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    3 | #include<algorithm>
  +++ |+#include <iomanip>
    4 | using namespace std;
Language: C

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

constexpr double pi = 3.14159265358979;

int main() {
    int r;
    cin >> r;
    printf("%.10f\n", 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 <iostream>
using namespace std;

int main(void){
    int r;
    cin >> r;
    const double PI=3.14159265358979323846;
    cout << 2. * PI * r;
    return 0;
}


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

// g++ -std=c++11 a.cpp
#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<map>
#include<set>
#include<unordered_map>
#include<utility>
#include<cmath>
#include<random>
#include<cstring>
#include<queue>
#include<stack>
#include<bitset>
#include<cstdio>
#include<sstream>
#include<iomanip>
#include<assert.h>
#include<typeinfo>
#define loop(i,a,b) for(long long i=a;i<b;i++)
#define rep(i,a) loop(i,0,a)
#define FOR(i,a) for(auto i:a)
#define pb push_back
#define all(in) in.begin(),in.end()
#define shosu(x) fixed<<setprecision(x)
#define show1d(v) {rep(_,v.size())cout<<" "<<v[_];cout<<endl;}
#define show2d(v) {rep(__,v.size())show1d(v[__]);}
using namespace std;
//kaewasuretyuui
typedef long long ll;
#define int ll
typedef int Def;
typedef pair<Def,Def> pii;
typedef vector<Def> vi;
typedef vector<vi> vvi;
typedef vector<pii> vp;
typedef vector<vp> vvp;
typedef vector<string> vs;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef pair<Def,pii> pip;
typedef vector<pip>vip;
#define mt make_tuple
typedef tuple<int,int,int,int> tp;
typedef vector<tp> vt;
template<typename A,typename B>bool cmin(A &a,const B &b){return a>b?(a=b,true):false;}
template<typename A,typename B>bool cmax(A &a,const B &b){return a<b?(a=b,true):false;}
const double PI=acos(-1);
const double EPS=1e-9;
Def inf = sizeof(Def) == sizeof(long long) ? 2e18 : 1e9+10;
int dx[]={-1,0,1,0};
int dy[]={0,1,0,-1};
#define yes cout<<"Yes\n"
#define no cout<<"No\n"

signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	double a;
	cin>>a;
	cout<<shosu(9)<<a*PI*2<<endl;
}











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

#include<iostream>
using namespace std;
int main(){
  double R;
  cin >> R;
  printf(%.4d, 2*R*3.14196);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:10: error: expected primary-expression before '%' token
    6 |   printf(%.4d, 2*R*3.14196);
      |          ^
Language: C

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

int main() {
    int r;
    double l;
    cin >> r;
    l = 2 * M_PI * r;
    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 <bits/stdc++.h>
using namespace std;
int main()
{
    double R;
	cin>>R;
	cout<<2*R*(3.1415926535897)<<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()
{
  double r,pi=3.1416;
  cin>>r;
  cout<<2*r*pi<<endl;
}

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

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

#include<bits/stdc++.h>

using namespace std;

typedef long double ll;

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

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