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

#include<stdio.h>
#include<math.h>
#define pb push_back
//#define FAST ios::sync_with_stdio(false);cin.tie(NULL),cout.tie(NULL);
//typedef long long ll;
#define pi acos(-1.0)
using namespace std;

int main()
{
     double r;
     scanf("%lf",&r);
     printf("%.12lf\n",2*pi*r);
//    cin>>r;
//    cout<<2*pi*r<<fixed<<setprecision(12)<<endl;
    return 0;
}


Compiler output:
main.c:7:1: error: unknown type name 'using'
    7 | using namespace std;
      | ^~~~~
main.c:7:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    7 | using namespace std;
      |                 ^~~
Language: C

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

#define ll long long
#define mii make_pair<int, int>
#define mll make_pair<ll, ll>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define rep(i, a, b) for (int i = a; i < b; ++i)
#define vi vector<int>
#define vvi vector<vector<int>>
#define vl vector<ll>
#define vvl vector<vector<ll>>
#define vb vector<bool>
#define vvb vector<vector<bool>>
#define all(v) (v).begin(), (v).end()

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

    double pi = 3.14159265358979323846;
    int r;
    cin >> r;
    printf("%.4lf", 2 * pi * r);
}

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

#include <bits/stdc++.h>
using namespace std;
 
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>
#define fio ios_base::sync_with_stdio(false);cin.tie(NULL);    
#define f(i,j,k)  for(int i=j;i<k;i++)
#define fr(i,j,k) for(int i<=k-1;i>=j;i--)
#define ll long long
#define ld long double
#define pi 3.14159265359
using namespace std;

int main()
{
	fio
	int TC;
	// cin>>TC;
	TC=1;
	while(TC--)
	{
		long double r;
		cin>>r;
		cout<<2*pi*r<<endl;
		
	}
	return 0;
}


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

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

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;
// type alias
typedef long long LL;
typedef pair<int,int> II;
typedef tuple<int,int,int> III;
typedef vector<int> VI;
typedef vector<string> VS;
typedef unordered_map<int,int> MAPII;
typedef unordered_set<int> SETI;
template<class T> using VV=vector<vector<T>>;
// minmax
template<class T> inline T SMIN(T& a, const T b) { return a=(a>b)?b:a; }
template<class T> inline T SMAX(T& a, const T b) { return a=(a<b)?b:a; }
// repetition
#define FORE(i,a,b) for(int i=(a);i<=(b);++i)
#define REPE(i,n)  for(int i=0;i<=(n);++i)
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  for(int i=0;i<(n);++i)
#define FORR(x,arr) for(auto& x:arr)
#define SZ(a) int((a).size())
// collection
#define ALL(c) (c).begin(),(c).end()
// DP
#define MINUS(dp) memset(dp, -1, sizeof(dp))
#define ZERO(dp) memset(dp, 0, sizeof(dp))
// stdout
#define println(args...) fprintf(stdout, ##args),putchar('\n');
// debug cerr
template<class Iter> void __kumaerrc(Iter begin, Iter end) { for(; begin!=end; ++begin) { cerr<<*begin<<','; } cerr<<endl; }
void __kumaerr(istream_iterator<string> it) { (void)it; cerr<<endl; }
template<typename T, typename... Args> void __kumaerr(istream_iterator<string> it, T a, Args... args) { cerr<<*it<<"="<<a<<", ",__kumaerr(++it, args...); }
template<typename S, typename T> std::ostream& operator<<(std::ostream& _os, const std::pair<S,T>& _p) { return _os<<"{"<<_p.first<<','<<_p.second<<"}"; }
#define __KUMATRACE__ true
#ifdef __KUMATRACE__
#define dump(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); __kumaerr(_it, args); }
#define dumpc(ar) { cerr<<#ar<<": "; FORR(x,(ar)) { cerr << x << ','; } cerr << endl; }
#define dumpC(beg,end) { cerr<<"~"<<#end<<": "; __kumaerrc(beg,end); }
#else
#define dump(args...)
#define dumpc(ar)
#define dumpC(beg,end)
#endif

// $ cp-batch CirclePond | diff CirclePond.out -
// $ g++ -std=c++14 -Wall -O2 -D_GLIBCXX_DEBUG -fsanitize=address CirclePond.cpp && ./a.out

/*
 
 4/19/2020
 
 5:10-
 
 */

const double PI = acos(-1);
int R;
void solve() {
  cout<<2.0*PI*R<<endl;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout<<setprecision(12)<<fixed;
  
  cin>>R;
  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 <stdio.h>
#include <math.h>
int main() {
	int rad;
	scanf("%d", &rad);
	printf("%f", float(2*rad* M_PI));
}

Compiler output:
main.c: In function 'main':
main.c:6:22: error: expected expression before 'float'
    6 |         printf("%f", float(2*rad* M_PI));
      |                      ^~~~~
Language: C

#include<bits/stdc++.h>

using namespace std;

#define ll             long long 
#define mod            1000000007
#define FIO            ios_base::sync_with_stdio(false); cin.tie(NULL);
                  
void initial()
{
	#ifndef ONLINE_JUDGE
	freopen("input.txt","r",stdin);
	freopen("output.txt","w",stdout);
	#endif
}


int main() 	 	
{
	initial();
	FIO;

	long double r;
	cin>>r;

	long double circum = 2*3.14*r;

	cout<<fixed<<setprecision(20)<<circum<<endl;
}



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

#include <bits/stdc++.h>
#define PI 3.141592653589
using namespace std;


void solve(long long N){
  cout << std::fixed << std::setprecision(10) << 2 * N * PI << endl;
}

int main(){
    long long N;
    scanf("%lld",&N);
    solve(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<math.h>
#include<stdio.h>
using namespace std;
int main(){
  int R；
  double PI=3.1415926535;
  cin>>R;
  cout<<2*R*PI<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: expected initializer before 'double'
    7 |   double PI=3.1415926535;
      |   ^~~~~~
a.cc:8:8: error: 'R' was not declared in this scope
    8 |   cin>>R;
      |        ^
a.cc:9:13: error: 'PI' was not declared in this scope
    9 |   cout<<2*R*PI<<endl;
      |             ^~
Language: C

#include<stdio.h>
#include<math.h>
 
int main()
{
  double r, Hr;
  scanf("%f",&r);
  Hr = 2.0 * M_PI * r;
  prinrf("%f", Hr);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:9:3: error: implicit declaration of function 'prinrf'; did you mean 'printf'? [-Wimplicit-function-declaration]
    9 |   prinrf("%f", Hr);
      |   ^~~~~~
      |   printf
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;
#define MOD 1000000007
#include <map>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF 2e9
#define ALL(v) v.begin(), v.end()
typedef long long ll;


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




int main() {
    float pi = 3.1415926;
    float r;
    cin >> r;
    cout << 2 * r * pi << endl;
}


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

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

int main(){
  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

// 154 A

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

using namespace std;

int main(){
    int r;
    cin >> r;
    cout << 2*r*3.141592653589793 << endl;
    return 0;
}


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

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

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


import java.util.Scanner;
public class Main{
public static void main(String[]args){

Scanner sc= new Scanner(System.in);
int R =sc.nextInt();
double ans =2*R*3.14;

System.out.println(and);

}
}

Compiler output:
Main.java:10: error: cannot find symbol
System.out.println(and);
                   ^
  symbol:   variable and
  location: class Main
1 error
Language: C

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

int main() {
  int R ;
  cin >> R;
  cout << "6,28" * R << endl;
}
  
  

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

#include <bits/stdc++.h>
#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 * M_PI * r;
    cout << std::fixed << std::setprecision(15) << 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 <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>

#define PI 3.1415926535897

typedef long long ll;

using namespace std;



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

    cout << r * 2 * PI;
   

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

int main() {
  int n; cin >> n;
  cout << 2*n*3.141592 << endl;
  return 0;
}

Compiler output:
main.c:3:1: error: unknown type name 'using'
    3 | using namespace std;
      | ^~~~~
main.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    3 | using namespace std;
      |                 ^~~
main.c: In function 'main':
main.c:7:10: error: 'cin' undeclared (first use in this function)
    7 |   int n; cin >> n;
      |          ^~~
main.c:7:10: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:3: error: 'cout' undeclared (first use in this function)
    8 |   cout << 2*n*3.141592 << endl;
      |   ^~~~
main.c:8:27: error: 'endl' undeclared (first use in this function)
    8 |   cout << 2*n*3.141592 << endl;
      |                           ^~~~
Language: C

#include<bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (int) n; i++)
using ll = long long;
template <class T>
using vt = std::vector<T>;
using vvi = std::vector<vt<int>>;

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

  std::cout << std::fixed << std::setprecision(10) << '\n';
  double pi = 3.1415926535;
  std::cout << 2.0*R*pi << '\n';
  return 0;
}


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

#include<bits/stdc++.h>
#define ll long long
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
 
int main(){

    float r;
    cin >> r;
    float ans;

    ans = 2*r*3.14159;

    cout << ans;

	return 0;
}

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

#include <bits/stdc++.h>
using namespace std;
#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 all(a) (a).begin(),(a).end()
#define print(v) { cerr<<#v<<": [ "; for(auto _ : v) cerr<<_<<", "; cerr<<"]"<<endl; }
#define printpair(v) { cerr<<#v<<": [ "; for(auto _ : v) cerr<<"{"<<_.first<<","<<_.second<<"}"<<", "; cerr<<"]"<<endl; }
#define dump(x) cerr<<#x<<": "<<x<<endl;
#define bit(k) (1LL<<(k))
typedef long long ll;
typedef pair<int, int> i_i;
typedef pair<ll, ll> l_l;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;
template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 >& p) {
  os << "{" <<p.first << ", " << p.second << "}";
  return os;
}
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

const int INF = (ll)1e9;
const ll INFLL = (ll)1e18+1;
const ll MOD = (ll)1e9+7;
const double PI = acos(-1.0);
/*
const int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
const string dir = "DRUL";
*/

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    double r;
    cin >> r;
    cout << r * 2 * PI << endl;
}

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

#include <iostream>
using namespace std;

int main()
{

	int a;
	cin >> a;

	double b;

	b = a * 2 * 3.141592;
	cout << b << endl;

	cin.get();
    cin.get();
    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;
typedef long long ll;
typedef pair<int, int> pii;

int main() {
  int R;
  cin >> R;
  double pi = 3.1415926;
  cout << setprecision(10) << 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 <bits/stdc++.h>
using namespace std;
double r;
int main(){
    cin>>r;
    cout<<r*2*3.1415926535<<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 << 3.1415 * R << endl;
}

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

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

typedef unsigned int uint;
typedef long long llong;
typedef unsigned long long ullong;
// -2.1e-9 <= int <= 2.1e9
// -9.2e-18 <= long long <= 9.2e18
// 0 <= unsigned int <= 4.2e9
// 0 <= unsigned long long <= 18.4e18

const double PI=3.1415926535897932;
int main()
{
    int R;
    cin >> R;
    double ans = 2.0 * PI * R;
    cout << fixed << setprecision(14);
    cout << ans << endl;
}


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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.zip.InflaterInputStream;

public class a {

    public static void main(String[] args) throws IOException {
        var rd = new BufferedReader(new InputStreamReader(System.in));
        var r = Integer.parseInt(rd.readLine());
        System.out.println(2 * Math.PI * r);
    }
}


Compiler output:
Main.java:6: error: class a is public, should be declared in a file named a.java
public class a {
       ^
1 error
Language: C

#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
#include <fstream>
#include <string>
#include <math.h>
#include <cstdlib>
#include <cstdint>
#include <istream>
#include <sstream>
#include <cctype>
#define fore(i,x,y) for(ll i=(x);i<(y);i++)
#define disp(a) cout << a << endl;
typedef long long ll;
using namespace std;

bool comp(const int& a, const int& b) {
	return a > b;
}

int main()
{
	double r;
	cin >> r;
	cout << 2*r * 3.14159265358979323846 << endl;

}

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

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

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

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


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

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

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

  cout << fixed << setprecision(20);

  cout << R*2*3.1415926535897932 << 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

/*
Grind Must Not Stop
*/
#include<bits/stdc++.h>
using namespace std;

int main()
{
    long double r;
    cin>>r;
    long double pi = 3.141592653589793238;
    cout<<setprecision(6)<<((long double)(((long double)2.000000000)*pi*r))<<endl;
    return 0;
}

Compiler output:
main.c:4:9: fatal error: bits/stdc++.h: No such file or directory
    4 | #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 << 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

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

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

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

#include<bits/stdc++.h>
using namespace std;
#define flb(i,a,b) for(int i=a;i<b;i++)
#define ll long long int
#define mp make_pair
#define pb push_back
#define inf (long long)(1e18+1e15)
typedef pair<int,int> ii;
typedef vector <int> vi;
typedef vector <pair<int,int> > vii;
typedef vector <vector <int> > vvi;

int main()
{
    float r;
    cin>>r;
    float pi=3.1415926536;
    float ans=2*pi*r;
    printf("%f",ans);
}


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

import java.util.Scanner;


public class Main.extension {
     
	public static void main(String[] args) {
	    Scanner scan = new Scanner(System.in);
    int radius = scan.nextInt();
     System.out.println(2*Math.PI*radius);
	}
}


Compiler output:
Main.java:4: error: '{' expected
public class Main.extension {
                 ^
1 error
Language: C

#include<bits/stdc++.h>
using namespace std;
int main(){
	float n;
	cin>>n;
	float pi = 3.14159265359;
	printf("%6f",2*pi*n);
	return 0;
}


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

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

int main(){
 int r;
 cin>>r;
 cout<<2*3.14159265359*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;
#define ll long long int
#define ld long double
#define vi vector<ll>
#define vvi vector<vi >
#define pi pair<ll,ll>
#define vvpi vector<vector<pi > >
#define vpi vector<pi >
#define vppi vector<pair<ll,pi > >
#define vs vector<string>
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define pb push_back
#define eb emplace_back
#define mkp make_pair
#define fs first
#define se second
#define fast ios_base::sync_with_stdio(false)
#define cintie cin.tie(NULL)
int main()
{
	ll r;
	cin>>r;
	cout<<fixed<<setprecision(30)<<2*M_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<stdio.h>
int main()
{
  int R;
  float C;
  scanf("%d",&R);
  C=2*pi*R;
  printf("%f",C);
  return 0;
}
  


Compiler output:
main.c: In function 'main':
main.c:7:7: error: 'pi' undeclared (first use in this function)
    7 |   C=2*pi*R;
      |       ^~
main.c:7:7: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include<conio>
#include<iostream>
using namespace std;
int main()
{
  long double r,res,n=22,d=7;
  cin>>r;
  res=n/d;
  res=res*2*r;
  cout<<res;
  return 0;
}


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

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

#define ld			long double
#define int         long long
#define pb          push_back
#define pii         pair<int,int>
#define vi          vector<int>
#define vii         vector<pii>
#define mi          map<int,int>
#define mii         map<pii,int>
#define all(a)      (a).begin(),(a).end()
#define x           first
#define y           second
#define sz(x)       (int)x.size()
#define endl        '\n'
#define MOD         100000000
#define sd(t) 		scanf("%d",&(t))
#define rep(i,a,b)  for(int i=a;i<b;i++)
#define hii 		cout << "hii" << endl
#define okay 		cout << "okay" << endl
#define hey 		cout << "hey" << endl
#define M_PIl       3.141592653589793238462643383279502884L 

template <class T> ostream& operator << (ostream &os, const vector<T> &v) { for (T i : v) os << i << ' '; return os; }
template <class T> ostream& operator << (ostream &os, const set<T> &v) { for (T i : v) os << i << ' '; return os; }
template <class T, class S> ostream& operator << (ostream &os, const pair<T, S> &v) { os << v.first << ' ' << v.second; return os; }
template <class T, class S> ostream& operator << (ostream &os, const unordered_map<T, S> &v) { for (auto i : v) os << '(' << i.first << "=>" << i.second << ')' << ' '; return os; } 
 
 
#ifndef ONLINE_JUDGE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
    template <class Arg1> void __f(const char* name, Arg1&& arg1) { cerr << name << " : " << arg1 << endl; }
    template <class Arg1, class... Args>
    void __f(const char* names, Arg1&& arg1, Args&&... args) {
        const char* sep = strchr(names + 1, ',');
        cerr.write(names, sep - names) << " : " << arg1 << "  ";
        __f(sep + 1, args...);
    }
#else
#define trace(...) 
#pragma GCC optimize ("O3")
#pragma GCC optimiz1e ("unroll-loops")
#pragma GCC target("avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define _CRT_SECURE_NO_WARNINGS
#endif ifndef ONLINE_JUDGE

void fast()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    
}

// clock_t time_p=clock();
// void starboy1299()
// {
//     time_p=clock()-time_p;
//     cerr<<"Time Taken : "<<(float)(time_p)/CLOCKS_PER_SEC<<"\n";
// }


void solve()
{	
	int r;
	cin >> r;
	ld ans = 2*(M_PI)*r;

	cout << fixed << setprecision(16) << ans << endl;
}				

int32_t main(){
	fast();
    int t = 1;
    // cin>> t;
    for(int i=1; i<=t; i++){
    	// cout << "Case #" << i << ": ";
    	solve();
    }
}




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<algorithm>
#include<vector>
#include<iomanip>
#include<math.h>
#include<complex>
#include<queue>
#include<deque>
#include<stack>
#include<map>
#include<set>
#include<bitset>
#include<functional>
#include<assert.h>
#include<numeric>
#include<stdio.h>
#include <cstdint>
#include <stdlib.h> 
#include <time.h>
using namespace std;
#define REP(i,m,n) for(int i=(int)(m) ; i < (int) (n) ; ++i )
#define rep(i,n) REP(i,0,n)
#define rrep(i,n) REP(i,1,n+1)
#define all(a) a.begin(), a.end()
#define fi first
#define se second
#define RNG(x, a, n) &((x)[a]), &((x)[n])
long long gcd(long long a, long long b) { return b == 0 ? a : gcd(b, a % b); }
long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }
typedef long long ll;
typedef pair<ll, ll> Pll;
typedef pair<int, int> PII;
typedef vector<ll> Vl;
typedef vector<int> VI;
typedef tuple<int, int, int> TT;
#define chmin(x,y) x = min(x,y)
#define chmax(x,y) x = max(x,y)
#define rall(v) v.rbegin(), v.rend()
#define dmp(x,y) make_pair(x,y)
#define dmt(x, y, z) make_tuple(x, y, z)
#define pb(x) push_back(x)
#define pf(x) push_front(x)
const int MAX = 500000;
const int inf = 1000000007;
const ll mod = 1000000007;
const ll longinf = 1LL << 60;
const long double PI = (acos(-1));
const long double EPS = 0.0000000001;

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




double a;

int main() {

	cin >> a;

	cout << a * PI * 2 << endl;

	return 0;
}

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

#include <bits/stdc++>

using namespace std;

int main() {
  
  int R;
  cin >> R;
  
  cout << 2*3.1416*R << endl;
  
  return 0;
}

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

int l = 2*3.14*R
printf(l)

Compiler output:
main.c:1:16: error: 'R' undeclared here (not in a function)
    1 | int l = 2*3.14*R
      |                ^
main.c:2:1: error: expected ',' or ';' before 'printf'
    2 | printf(l)
      | ^~~~~~
Language: C++

#include<iostream>
#include<math.h>
#include<stdio.h>
using namespace std;
int main(){
  int R,
  double PI=3.1415926535;
  cin>>R;
  cout<<2*R*PI<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: expected unqualified-id before 'double'
    7 |   double PI=3.1415926535;
      |   ^~~~~~
a.cc:9:13: error: 'PI' was not declared in this scope
    9 |   cout<<2*R*PI<<endl;
      |             ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
  cout<<setprecision(6);
  cout<<fixed;
	double pi=3.141592653589793238.;
	double r; cin>>r;
	double val=(double)pi*2*r;
	cout<<val;
	
}

Compiler output:
a.cc:8:19: error: too many decimal points in number
    8 |         double pi=3.141592653589793238.;
      |                   ^~~~~~~~~~~~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  int r;
  double pi == 3.1415926535897;
  cout<<2*pi*r;
  
  
  return 0;  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:13: error: expected initializer before '==' token
    6 |   double pi == 3.1415926535897;
      |             ^~
a.cc:7:11: error: 'pi' was not declared in this scope
    7 |   cout<<2*pi*r;
      |           ^~
Language: C

#include <bits/stdc++.h>
#define inf 1000000007
#define mod 1000000007
//#pragma GCC optimize(2)
//#define int long long
#define pi 3.1415926535897932384
using namespace std;
template <typename T> void read(T &x){
	x=0;char ch=getchar();int fh=1;
	while (ch<'0'||ch>'9'){if (ch=='-')fh=-1;ch=getchar();}
	while (ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
	x*=fh;
}
template <typename T> void write(T x) {
	if (x<0) x=-x,putchar('-');
	if (x>9) write(x/10);
	putchar(x%10+'0');
}
template <typename T> void writeln(T x) {
	write(x);
	puts("");
}
signed main()
{
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	double r;
	cin>>r;
	cout<<fixed<<setprecision(12)<<2.0*r*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 <iostream>
using namespace std;
const double PI=3.14159265358979323846;

int main(){
	float r;
	cin >> r;	
	cout << 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 <iostream>
#include <math.h>
#include <vector>
#include <algorithm>


typedef long long ll;

using namespace std;

#define PI 3.1415 
  
double circumference(double r) 
{ 
    double cir = 2*PI*r; 
    return cir; 
} 

int main() 
{ 

	double r;
	cin >> r;

	cout << circumference(r);

	return 0; 
} 


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

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

#define F first
#define S second
#define eb emplace_back
#define PI 3.14159265
#define sz(c) (int)c.size()
#define len(c) (int)c.length()
#define hcf(a, b) __gcd(a, b)
#define all(c) c.begin(), c.end()
#define vint vector<int>
#define vll vector<ll>
#define vpint vector<pair<int, int>>
#define vpll vector<pair<ll, ll>>
#define tr(container, it) \
    for (typeof(container.begin()) it = container.begin(); it != container.end(); it++)
#define fr(it, a, b) \
    for (int it = (a); it < (b); it++)
#define present(container, element) (container.find(element) != container.end())
#define cpresent(container, element) (find(all(container), element) != container.end())
#define maximum(a, b, c) (a > b ? (a > c ? a : c) : (b > c ? b : c))
#define minimum(a, b, c) (a < b ? (a < c ? a : c) : (b < c ? b : c))
typedef long long ll;
typedef long double ld;
typedef unsigned long long lu;
const ll mod = 1e9 + 7;
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ld r;
    cin>>r;
    cout.precision(28);
    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>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
typedef long long ll;

int main() {
  int n; cin >> n;
  cout << 2*n*3.141592 << 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: Java

import java.util.Scanner;

public class SolutionClass {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int radius = in.nextInt();

        double circumference = (double) 2 * Math.PI * radius;
        System.out.println(circumference);
    }
}

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

#include <stdio.h>
#include 

int main(void){
  int r;
  double pi = 3.141592654;
  printf("半径：");
  scanf("%d", &r);
  printf ("%f", 2.0 * pi * r);
  return 0;
}

Compiler output:
main.c:2:10: error: #include expects "FILENAME" or <FILENAME>
    2 | #include
      |          ^
Language: C

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

int main() {
  float R, P, A;
  cin >> R;
  P = 3.14;
  A = 2 * R * P;
  
  cout << A;
}

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

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

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

  cout << 2 * M_PI * R;
}

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

import math
def round(x):
    return 2* math.pi * x
R = int(input())
if __name__== "__maib__":
    print(round(R))


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

#include <iostream>
using namespace std;
int main(){
  int r;
  cin>>r;
  cout<<2*r*3.141592653589793238462643383279502884197169399375105820974944;
}

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

#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;

#define dump(x)  cerr << #x << " = " << (x) << endl;
#define PB push_back
#define MP make_pair
#define ll long long

inline int toInt(string s){int v;istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x){ostringstream sout;sout<<x;return sout.str();}

int main(){
    std::ios::sync_with_stdio(false);
    int r;
    cin >> r;
    cout << 2 * r * 3.1415926535 << endl;
}

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

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

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

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

#define M_PI 3.1415926535897

typedef long long ll;

using namespace std;



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

    cout << r * 2 * M_PI;
   

    return 0;
}

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

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

int main(){
    double n;
    cin>>n;
    cout<<2.0*n*3.141592<<endl;
}

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

/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>

using namespace std;

int main()
{
    int n;
    cin>>n;
    printf("%.2lf",2*3.14159*n);

    return 0;
}


Compiler output:
main.c:9:10: fatal error: iostream: No such file or directory
    9 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <set>
#include <map>
#include <stack>
#include <queue>
#include <cmath>
#include <ctime>
#include <vector>
#include <cstdio>
#include <string>
#include <cstring>
#include <iostream>
#include <algorithm>

using namespace std;

#define LL long long
#define pii pair<int,int>
#define sd(x) scanf("%d",&x)
#define slld(x) scanf("%lld",&x)
#define pd(x) printf("%d\n",x)
#define plld(x) printf("%lld\n",x)
#define rep(i,a,b) for(int i = (a) ; i <= (b) ; i++)
#define per(i,a,b) for(int i = (a) ; i >= (b) ; i--)
#define mem(a) memset(a,0,sizeof(a))
#define lson l , m , rt << 1
#define rson m + 1 , r , rt << 1 | 1
#define fast_io ios::sync_with_stdio(false)

const int INF = 1e9;
const LL mod = 1e9 + 7;
const int maxn = 2e5 + 7;

int a[maxn];

int main() {
    double r;
    scanf("%lf",&r);
    printf("%lf\n",2 * acos(-1.0) * r);
    return 0;
}


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

#include <iostream>
using namespace std;
int main(void){
    // Your code here!
    int r;
    cin >> r;
    cout<< 2 * r * 3.141592 << endl;
}


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

include<math.h>
include<iostream>
using namespace std;

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

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<math.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope
    8 |   cin >> r;
      |   ^~~
a.cc:9:3: error: 'cout' was not declared in this scope
    9 |   cout << 2*math.PI*r << endl;
      |   ^~~~
a.cc:9:13: error: 'math' was not declared in this scope
    9 |   cout << 2*math.PI*r << endl;
      |             ^~~~
a.cc:9:26: error: 'endl' was not declared in this scope
    9 |   cout << 2*math.PI*r << endl;
      |                          ^~~~
Language: C

#include <iostream>
#include <string>
#include <algorithm>
#include <math.h>
#include <vector>
#include <iomanip>

using namespace std;

#define fori(x) for (int i = 0; i < x; ++i)
#define forj(x) for (int j = 0; j < x; ++j)

int main() {
    int r;
	cin >> r;
    cout<<fixed<<setprecision(5)<<((float)r*2)*3.14159265;
	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>
#include<cmath>
int main(){
	double i;
	scanf("%lf",&i);
	printf("%.20lf",i*2.00*acos(-1.00));
	return 0;
}

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

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

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

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

  #include <bits/stdc++.h>
 #define len length

using namespace std;
typedef long long ll;

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

   double n;
   cin>>n;
   n*=2;
   n*=3.14159265359;
   cout<<n<<setprecision(6)<<fixed;
 return 0;
}


Compiler output:
main.c:1:12: fatal error: bits/stdc++.h: No such file or directory
    1 |   #include <bits/stdc++.h>
      |            ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

import java.util.*;
import java.io.*;
public class Main
{
	public static void main(String args[]) throws IOException{
		BufferedReader in = new BufferedReader();
		out(2*Math.PI*in.nextDouble()+"");
		
	}
	static void out(String s){
		System.out.print(s);
	}
}



class BufferedReader 
{ 
    java.io.BufferedReader br; 
    StringTokenizer st; 

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

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

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

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

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

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

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.*;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.*;
      |            ^
main.c:2:1: error: unknown type name 'import'
    2 | import java.io.*;
      | ^~~~~~
main.c:2:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | import java.io.*;
      |            ^
main.c:3:1: error: unknown type name 'public'
    3 | public class Main
      | ^~~~~~
main.c:3:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Main'
    3 | public class Main
      |              ^~~~
main.c:17:1: error: unknown type name 'class'
   17 | class BufferedReader
      | ^~~~~
main.c:18:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
   18 | {
      | ^
Language: C

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

int main(void){
  int r;
  scanf("%d", &r);
  print("%f", 2*r*M_PI);
  return 0
}

Compiler output:
main.c: In function 'main':
main.c:7:3: error: implicit declaration of function 'print'; did you mean 'lrint'? [-Wimplicit-function-declaration]
    7 |   print("%f", 2*r*M_PI);
      |   ^~~~~
      |   lrint
main.c:8:11: error: expected ';' before '}' token
    8 |   return 0
      |           ^
      |           ;
    9 | }
      | ~
Language: C

#define ll long long
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mp make_pair
#define fo(i , n) for(ll i = 0 ; i < n ; i++)
//#include<bits/stdc++.h>
#include<iomanip>
#include<cmath>
#include<cstdio>
#include<utility>
#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<map>
#include<queue>
#include<set>
#include<stack>
double pi = acos(-1) ;
ll z =  1000000000 ;
ll inf = 6000000000000000000 ;
ll p1 = 37 ;
ll p2 = 53 ;
ll mod1 =  202976689 ;
ll mod2 =  203034253 ;
ll gcd(ll a , ll b){ if(b > a) return gcd(b , a) ; if(b == 0) return a ; return gcd(b , a%b) ;}
ll power(ll a ,ll b , ll p){if(b == 0) return 1 ; ll c = power(a , b/2 , p) ; if(b%2 == 0) return ((c*c)%p) ; else return ((((c*c)%p)*a)%p) ;}
ll inverse(ll a ,ll n){return power(a , n-2 , n) ;}
ll max(ll a , ll b){if(a > b) return a ; return b ;}
ll min(ll a , ll b){if(a < b) return a ; return b ;}
ll left(ll i){return ((2*i)+1) ;}
ll right(ll i){return ((2*i) + 2) ;}
void swap(ll&a , ll&b){ll c = a ; a = b ; b = c ; return ;}
//ios_base::sync_with_stdio(0);
//cin.tie(0); cout.tie(0);
using namespace std ;
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds; 
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
// ordered_set s ; s.order_of_key(val)  no. of elements strictly less than val
// s.find_by_order(i)  itertor to ith element (0 indexed)
//__builtin_popcount(n) -> returns number of set bits in n

void solve()
{
	ll n ;
	cin >> n ;
	cout << fixed << setprecision(10) << (2*pi*n) << endl ;
	return ;
}
 
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
   /* #ifndef ONLINE_JUDGE
    freopen("inputf.txt" , "r" , stdin) ;
    freopen("outputf.txt" , "w" , stdout) ;
    freopen("error.txt" , "w" , stderr) ;
    #endif*/
    
    ll t ;
    //cin >> t ;
    t = 1 ;

    while(t--)
    {
        solve() ;
    }
    //cerr << "Time : " << 1000 * ((double)clock()) / (double)CLOCKS_PER_SEC << "ms\n";
 
    return 0;
}

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

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

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

Compiler output:
a.cc:1:2: error: stray '#' in program
    1 | V#include <bits/stdc++.h>
      |  ^
a.cc:1:1: error: 'V' does not name a type
    1 | V#include <bits/stdc++.h>
      | ^
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> N;
      |   ^~~
a.cc:7:3: error: 'cout' was not declared in this scope
    7 |   cout << N * 3.14 * 2 << endl;
      |   ^~~~
a.cc:7:27: error: 'endl' was not declared in this scope
    7 |   cout << N * 3.14 * 2 << endl;
      |                           ^~~~
Language: C

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

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

    std::cout << ans << std::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() { 
    ios_base::sync_with_stdio(0); 
    cin.tie(0);
    cout << setprecision(20);
    double n;
    cin >> n;
    double c = 2* acos(-1) * n;
    cout << c << '\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

import math
print(2 * math.pi * float(input()))

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import math
      | ^~~~~~
main.c:2:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'print'
    2 | print(2 * math.pi * float(input()))
      | ^~~~~