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

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

int main()
{
  double r;
  cin >> r;
  printf("%.9lf\n", 2.0 * r * M_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;
typedef long long ll;
const ll mod=1e9+7;
const ll INF=mod*mod;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define all(x) (x).begin(),(x).end()
ll min(ll a,ll b){
  if(a>b){
    return b;
    }
      else{
        return a;
      }
  }
  
  ll max(ll a,ll b){
    if(a>b){
      return a;
    }
    else{
      return b;
    }
  }

ll power(ll a,ll b){
 ll ans=1;
 for(ll i=1;i<=b;i++){
ans*=a;
  }
  return ans;
}

 ll gcd(ll m,ll n){
 	if(n==0){
       return m;
     }
   return gcd(n,m%n);
 }
ll lcm(ll a,ll b){
  ll g=gcd(a,b);
  return a/gcd(a,b)*b;
		

}
int main(){
  
  ll R;
  cin>>R;
  printf("%.20f\n",1.0*R*2*M_PI);
  
}


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

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

int main(){
    int r;
    cin>>r;
    double pai=3.1415;
    cout<<fixed<<setprecision(5);
    cout<<2*r*pai<<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 << fixed << setprecision(5);
  cout << R*3.14159 << endl;
}


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

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

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

int main(){
    int r; 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>

int main(){
  double R;
  std::cin >> R;
  printf("%10.8f\n", 2 * R * 3.14159265359 );
}

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

const double PI=3.14159265358979323846;

int main() {
    int r;
    cin >> r ;
    
   cout << setprecision(10) << fixed << 2*PI << endl;
	return 0;
}



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

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

int main() {
  double R;
  cin >> R;
 cout << R * 6.28 << endl;
}


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

#include<bits/stdc++.h>
using namespace std;
int main()
{
  int a;
  cin>>a;
  cout<<a*2*3.14;
  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;
typedef long long ll;
const ll p = 1e9 +7;
const ll h = 1e5+1;
ll R, k, f[h];

void rf()
{
    ios_base::sync_with_stdio(0); cin.tie(0), cout.tie(0);
    cin >> R;
}

void xuli()
{
    cout << R * 2 * 3.14;
}

int main()
{
    rf(); xuli();
}


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

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
7
int main() {
    int r;
    cin>>r;
    double PI = 3.14159265359;
    cout<<r*2*PI<<endl;
}

Compiler output:
a.cc:5:1: error: expected unqualified-id before numeric constant
    5 | 7
      | ^
Language: C

program main
    use, intrinsic :: iso_fortran_env
    implicit none
    real(real64) :: r, l
    real(real64), parameter :: pi = 4.0d0*atan(1.0d0)
    read*, r
    l = 2*pi*r
    print*, l
end program main


Compiler output:
main.c:1:1: error: unknown type name 'program'
    1 | program main
      | ^~~~~~~
main.c:2:5: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'use'
    2 |     use, intrinsic :: iso_fortran_env
      |     ^~~
main.c:5:37: error: invalid suffix "d0" on floating constant
    5 |     real(real64), parameter :: pi = 4.0d0*atan(1.0d0)
      |                                     ^~~~~
main.c:5:48: error: invalid suffix "d0" on floating constant
    5 |     real(real64), parameter :: pi = 4.0d0*atan(1.0d0)
      |                                                ^~~~~
Language: C

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

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    snl(n);
    cout << fixed << setprecision(20) << (double)(2*pi*n) << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'snl' was not declared in this scope; did you mean 'ynl'?
    6 |     snl(n);
      |     ^~~
      |     ynl
a.cc:7:53: error: 'pi' was not declared in this scope
    7 |     cout << fixed << setprecision(20) << (double)(2*pi*n) << endl;
      |                                                     ^~
Language: C

#include <iostream>
using namespace std;
int main(void){
    // Your code here!
    double a;
    
    cin >> a;
    
    cout << a*2 * 3.14 << endl;
}


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

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
using ll = long long;
using P = pair<int,int>;
void Yes() {
    cout << "Yes" << endl;
}
void No() {
    cout << "No" << endl;
}
int main(void) {
    double pi = 3.1415926535;
    double r; cin >> r;
    printf("%.10f\n", 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;
typedef  long long int ll;
#define pb push_back
typedef long double ld;
#define fi first
#define se second
#define mp make_pair

vector<vector<pair<ll,ll>>> out(1e5);
vector<vector<ll>> in(1e5);
ll inf=1e18;
ll p=1e9+7;
ll phi(ll n) {
    ll result = n;
    for (ll i = 2; i * i <= n; i++) {
        if(n % i == 0) {
            while(n % i == 0)
                n /= i;
            result -= result / i;
        }
    }
    if(n > 1)
        result -= result / n;
    return result;
}
ll power(ll x, ll y, ll p)
{
    ll res = 1;
    x = x % p;
   while (y > 0)
    {
        if (y & 1)
            res = (res*x) % p;
        y = y>>1;
        x = (x*x) % p;
    }
    return res;
}
ll modInverse(ll n, ll p)
{
    return power(n, p-2, p);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
	ll n,i,j,t,a,b,temp,m,k,x,y,ctr;
	ld r;
	cin>>r;
	ld ans=(2.0)*(3.14159)*r;
	cout<<fixed<<setprecision(6)<<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>
using namespace std;
#define mod 1000000007
#define int long long int
#define pb push_back
#define mk make_pair
#define flp(i, k, n) for(int i=k; i<n; i++)
#define rev(i, k) for(int i=k; i>=0; i--)
#define F first
#define S second
#define IOS ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int dx[4] = {-1,1,0,0};
int dy[4] = {0,0,-1,1};

int32_t main(void)
{
    int r;
    cin>>r;
    r*=2;
    cout<<(double)(r)*(double)(3.14)<<"\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++

float r=0;
cin>>r;

float c = 2*3.1416*r;

cout<<r;

Compiler output:
a.cc:2:1: error: 'cin' does not name a type
    2 | cin>>r;
      | ^~~
a.cc:6:1: error: 'cout' does not name a type
    6 | cout<<r;
      | ^~~~
Language: C

#include <iostream>
using namespace std;

int main() {
	int r;
	cin>>r;
	double cir = 6.28318530717958623200*r;
	cout<<cir;
	return 0;
}

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

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

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

#include <bits/stdc++.h>
using namespace std;
 
int N;
cin>>N;
double ans;
ans=3.141592*2*N;
cout<<ans<<endl;

Compiler output:
a.cc:5:1: error: 'cin' does not name a type
    5 | cin>>N;
      | ^~~
a.cc:7:1: error: 'ans' does not name a type
    7 | ans=3.141592*2*N;
      | ^~~
a.cc:8:1: error: 'cout' does not name a type
    8 | cout<<ans<<endl;
      | ^~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
int main(void){
    int r;
    cin >> r;
    double ans=2.0*r*M_PI;
    cout << ans << endl;
    return 0;
}

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

#include <bits/stdc++.h>
#include <algorithm>
#include <math.h>
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
#define INF 999999999
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );

using llong = long long;
using namespace std;


int main(){
    double r;
    cin >> r;
    cout << 6.28318530717958623200*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()
{
    ios::sync_with_stdio();cin.tie(0);cout.tie(0);
    #define pb push_back
    #define mk make_pair
    //#define int long long int
    float r;
    cin>>r;
    cout<<setprecision(20)<<fixed<<2*r*3.141592653589793238<<endl;



    return 0;
}


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

#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define REPI(i,a,b) for(int i=int(a);i<int(b);++i)
#define RREP(i,x) for(int i=((int)(x)-1);i>=0;i--)
#define ALL(x) (x).begin(),(x).end()


int main () {
  long long r;
  cin >> r;
  cout << ((r*2) * acos(-1)) << 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.h>
using namespace std;

void main()
{
float r;
cin>>r;
float a=2*3.1414*r;
cout<<a;
return;
}

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

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int R;
  cin >> R;
  cout << 2 * 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 "bits/stdc++.h"
 
using namespace std;
 
#define fast_cin() ios_base::sync_with_stdio(false);cin.tie(NULL)
#define rep(i, x, n) for(int i=x; i<n; i++)
#define all(x) x.begin(), x.end()
#define pb push_back
#define eb emplace_back
#define trav(a, x) for(auto& a: x)
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define MOD 1000000007
#define endl '\n'
#define MAX 100002
#define pii pair<int, int>
#define pll pair<long long, long long>
 
typedef vector<int> vec;
typedef long long int ll;
typedef unsigned long long ull;



int main(){
    fast_cin();
    double n;cin>>n;
    double ans=2*n*3.14;
    printf("%.20f\n",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: C

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define fi first
#define se second
ll sieve[1000001]={0},i,j;
ll m=1e9+7;
ll lev=0;
ll n,k;
ll power(ll p, ll k)
{
ll a=1;
while(k)
{
if(k&1)
a=(a*p)%m;
p=(p*p)%m;
k>>=1;
}
return a;
}
using namespace std;
vector<ll> v[1000000+1];
ll vis[1000000+1]={0};
void dfs(ll u,ll p,ll lev)
{
    vis[u]=lev;
for(auto x: v[u])
{
if(x!=p)
{
dfs(x,u,lev+1);
}
}
}
bool sec(pair<int,int> &a, 
              pair<int,int> &b) 
{ 
    return (a.second < b.second); 
} 
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 int tc=1;
//cin>>tc;
ll cas=1;
 while(tc--)
 {
  
  ll r;
  cin>>r;
  cout<<3.14*r; 
     cout<<"\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 <iostream>
#include <string>
#include <vector>
#include <iomanip>

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

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;

#define PI 3.14159263

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

  cout << std::fixed << std::setprecision(4) << 2 * R * PI << endl;

  return 0;
}


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

#include<bits/stdc++.h>
typedef long long ll;
typedef long double ld;
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define PRECISION std::cout << std::fixed << std::setprecision(20);
#define setzero(x) memset(x,0,sizeof(x))
  
using namespace std;
 
const int inf = 2e9+500;
const int N = 1e3+10;
const int bits = 20;
const ld pi = 3.14159265358979323846;
const ll mod = 1e9;
const ll p = 29;


int main(){

    FASTIO;
    PRECISION; 
    ld r;
    cin>>r;
    cout<<2.0*pi*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 <bits/stdc++.h>
#define gcd(m,n) __gcd(m,n)
#define lcm(m,n) m*(n/gcd(m,n))
#define fast std::ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define pi acos(-1.0)
#define endl '\n'
#define MOD 1000000007
#define ull unsigned long long
#define ll long long
#define ld long double
#define pb push_back
#define dbg(x) cout << #x << "  " << x << endl;
 
ll power(ll base, ll exp) 
{ll res=1;while(exp>0) {if(exp%2==1) res=(res*base);base=(base*base);exp/=2;}return res;}
ll mod(ll a, ll b) {return (a % b + b) % b;}
using namespace std;

int main() 
{  
	fast;
	ll R;
	cin>>R;
	cout << 2*pi*R << endl;
}

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

#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; ++i)
#define INF 100100100
using namespace std;
using ll = long long;
using P = pair<int,int>;
using Graph = vector<vector<int>>;

const double pi = acos(-1); 

int main(){
  double r;
  double ans = 2*pi*r;
  cout << fixed << setprecision(10);
  cout << ans << endl;
  return 0;
}


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

#include<bits/stdc++.h>
using namespace std;
//A
const double pi=3.141592658;
int main(){
    double r,ans;
    scanf("%lf",&r);
    ans=2*r*pi;
    printf("%lf",ans);
}


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

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  double a = 0;
  cin >> a;
  a = 3.14*a;
  cout << a << endl;
}

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

#include <bits/stdc++.h>
int main()
{
    using namespace std;
    int R;
    cin >> R;
    double S = R * M_PI * 2;
    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

#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rrep(i, n) for (int i = 1; i <= (n); ++i)
#define drep(i, n) for (int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;

int main() {
  double r;
  cin >> r;
  cout << fixed;
  cout << setprecision(10);
  cout << r *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

#include<bits/stdc++.h>
using namespace std;
int main(){
double R;
  cin>>R;
  double ans=2*3.1415*R;
  cout<<fixed<<setprecision(4)<<ans<<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

/*starting with the name of almighty ALLAH*/
/*solved by RAKIB JOY*/
#include<bits/stdc++.h>
#define ll long long int
#define pb push_back
#define vc vector
#define vi vc<int>
#define vl vc<ll>
#define dbg(x) cout<<x<<endl;
#define mp(x,y) make_pair(x,y)
#define yes dbg("YES")
#define no dbg("NO")
#define tst int t;cin>>t;while(t--)
#define srt(v) sort(v.begin(),v.end());
#define rsrt(v) sort(v.begin(),v.end(),greater<int>());
#define rj ios::sync_with_stdio(false);cin.tie(0);
#define rvs(v) reverse(v.begin(),v.end());
#define F first
#define S second
using namespace std;
int main()
{
    rj
    double a,b=3.14159;
    cin>>a;
   printf("%.2lf\n",2*a*b);

    return 0;
}


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

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <iterator>
#include <algorithm>
#include <map>
#include <string.h>
#include <vector>
#include <cmath>
#include <deque>
#include <iomanip>

using namespace std;
#define range(a) a.begin(), a.end()
#define rep(i, c) for(int i = 0; i < (int)c; i++)
typedef long long ll;

template <typename T> ostream& operator<<(ostream& out, vector<T> &v){
  for (int i = 0; i < (int)v.size(); i++) {
    out<<v[i]<<' ';
  }
  return out;
}

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

  float n; cin >> n;

  cout << n * 2 * 3.141592653589 << endl;

  return 0;
}


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

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

Compiler output:
main.c:1:1: error: unknown type name 'from'
    1 | from math import pi
      | ^~~~
main.c:1:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'import'
    1 | from math import pi
      |           ^~~~~~
main.c:1:11: error: unknown type name 'import'
Language: C

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

int main() {
  int R;
  cin >> R;
  cout << R*2*3.14159265 << 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 <algorithm>
#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long int llint;
using namespace std;


int main() {
	double n;
	cin >> n;
    n =2*n*M_PI;
	cout << n;   
	return 0;
}

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

#include <stdio.h>

int main(void){
  int r;
  scanf("%d",&r);
  printf("%d\n", r * M_PI);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:22: error: 'M_PI' undeclared (first use in this function)
    6 |   printf("%d\n", r * M_PI);
      |                      ^~~~
main.c:6:22: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <bits/stdc++.h>
using namespace std;
#define ll long long
# define pi 3.14159265358979323846264338327950
int main()
{
    int n;
    cin >> n;
    cout << 2*pi*n << endl;
}


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

#include <iostream>
#include <vector>
#include <string>
using namespace std;

int main(){
  int R;
  cin >> R;
  int answer = R*2*3.1415926;
  cout << answer << 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>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

const double PI = 3.14159265358979323846;

int main() {
  int r;
  cin >> r;
  double ans = (double)2.0 * (double)r * PI;
  cout << ans << endl;
  return 0;
}

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

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

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

 

    #include <bits/stdc++.h> 

#define ll long long
#define M 1000000007
using namespace std;
int main() 
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); 
	int n,m,k,a,b;
    cin>>n;
    cout<<2*3.1415*n;
    
    
}

Compiler output:
main.c:3:14: fatal error: bits/stdc++.h: No such file or directory
    3 |     #include <bits/stdc++.h>
      |              ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

void testCase() {    
    
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    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 <iostream>
#include <cstdio>
using namespace std;

double n;
int main() {
	cin >> n;
	printf("%.9f", 2*n*3.141592);
	return 0;
}


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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class A {
	public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		int n = sc.nextInt();
		double a = 2 * n * Math.PI;
		System.out.println(a);
	}

	static class FastScanner {
		private BufferedReader reader = null;
	    private StringTokenizer tokenizer = null;
	    public FastScanner(InputStream in) {
	        reader = new BufferedReader(new InputStreamReader(in));
	        tokenizer = null;
	    }

	    public String next() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                tokenizer = new StringTokenizer(reader.readLine());
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }
	        return tokenizer.nextToken();
	    }

	    public String nextLine() {
	        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
	            try {
	                return reader.readLine();
	            } catch (IOException e) {
	                throw new RuntimeException(e);
	            }
	        }

	        return tokenizer.nextToken("\n");
	    }

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

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

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

	    public int[] nextIntArray(int n) {
	        int[] a = new int[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextInt();
	        return a;
	    }

	    public long[] nextLongArray(int n) {
	        long[] a = new long[n];
	        for (int i = 0; i < n; i++)
	            a[i] = nextLong();
	        return a;
	    }
	}
}

Compiler output:
Main.java:7: error: class A is public, should be declared in a file named A.java
public class A {
       ^
1 error
Language: C

#include <bits/stdc++.h>
using namespace std;
int r;
double c;
int main(){
	cin >> r;
	c = 6.28318530717958623200 * r;
	cout << c;
	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()
{
  double x;
  cin>>x;
  cout<<(double)2*3.14.x<<endl;
}

Compiler output:
a.cc:7:19: error: too many decimal points in number
    7 |   cout<<(double)2*3.14.x<<endl;
      |                   ^~~~~~
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;
  cout << (2 * r * 3.141592) << endl;
}


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

#include <bits/stdc++.h>
using namespace std;
int main(void){
 double pi = 6.28318530717958623200 / 2;
 double r;
 cin >> r;
 cout << 2* r* pi;
 
}


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

#include <bits/stdc++.h>
using namespace std;
const int INF = 2147483647;
using ll = long long;

int main(){
    double r;
    cin >> r;
    printf("%.20lf",2*M_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 <iostream>
#include <bits/stdc++.h>
using namespace std;
int main(void){
    int r;
    cin >> r;
    cout << 2*r*M_PI;
    return 0;
}


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

import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;

public class ProblemA {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		
		//inputs
		int r = input.nextInt();
		System.out.println(2 * Math.PI * r);
	  
	
	}

}

Compiler output:
Main.java:11: error: class ProblemA is public, should be declared in a file named ProblemA.java
public class ProblemA {
       ^
1 error
Language: C

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

const double PI = 3.14159;

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

#inculude<bits/stdc++.h>
using namespace std;
int main(){
	double a,b=3.14159;
	cin>>a;
	cout<<a*2.00*b;
	return 0;
} 

Compiler output:
main.c:1:2: error: invalid preprocessing directive #inculude; did you mean #include?
    1 | #inculude<bits/stdc++.h>
      |  ^~~~~~~~
      |  include
main.c:2:1: error: unknown type name 'using'
    2 | using namespace std;
      | ^~~~~
main.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespace std;
      |                 ^~~
main.c: In function 'main':
main.c:5:9: error: 'cin' undeclared (first use in this function)
    5 |         cin>>a;
      |         ^~~
main.c:5:9: note: each undeclared identifier is reported only once for each function it appears in
main.c:6:9: error: 'cout' undeclared (first use in this function)
    6 |         cout<<a*2.00*b;
      |         ^~~~
Language: C

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <iomanip>
#include <cmath>
using namespace std;

int main(){
	double pi=3.141592;
	double r;
	cin>>r;
	cout<<setprecision(10)<<(r*2)*pi<<endl;
	return 0;
}

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

/// wa ^3^

#pragma GCC optimize("O3")

#include<bits/stdc++.h>

#define x first
#define y second
#define pb push_back
#define sz(x) (int) x.size()
 
using namespace std;

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

const int MOD = 1e9 + 7;
const int INF32 = 1e9 + 1e2;

void stndrtn() {
#ifdef hitorie
    freopen(".in", "r", stdin);
#endif        
}

void maincode() {
    double r;
    cin >> r;
    cout << setprecision(10) << fixed << 2.0 * acos(-1) * r; 
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr), stndrtn();
    int ts = 1;
    if (flag) 
        cin >> ts;
    while (ts--)
        maincode(); 
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:36:9: error: 'flag' was not declared in this scope
   36 |     if (flag)
      |         ^~~~
Language: C++

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

int main() {
  double R;
  cin >> R;
  double ans;
  ans = 2*R*3.14159265;
    
    cout << ans << endl;
 return0;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:2: error: 'return0' was not declared in this scope
   11 |  return0;
      |  ^~~~~~~
Language: C

#include <bits/stdc++.h>
#define Phuong_ ios_base::sync_with_stdio(0); cin.tie(0);
#define pb push_back
#define mp make_pair

/// easy access -------------
using namespace std;
using ll = long long;
using ld = long double;
typedef pair<int,int> pii;
///-------------------------

int main()
{
    Phuong_; /// <3
    double n;
    cin >> n;
    cout << setprecision(10) << n*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 <algorithm>
#include <cassert>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <vector>
#include <cmath>

#include <limits.h>

using namespace std;

typedef long long ll;

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;
}

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

    double ans = 2 * R * M_PI;
    printf("%.3f\n", ans);
    return 0;
}


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

#include "bits/stdc++.h"

using namespace std;
using LL = long long;

constexpr int N = 1e5 + 5;

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);
	
	int r;
	cin >> r;

	const double pi = acos(-1.0);

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

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

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

#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,n,a) for (int i=n-1;i>=a;i--)
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define SZ(x) ((x).size())
#define i0(x) memset(x,0,sizeof(x))
#define i1(x) memset(x,-1,sizeof(x))
#define el cout<<endl
#define mp make_pair
#define pb push_back
#define X first
#define Y second
#define MOD 1000000007
#define N 100000
#define M 500000

#define trace1(x)                    cout <<#x<<": "<<x<< endl;
#define trace2(x, y)                 cout <<#x<<": "<<x<<" | "<<#y<<": "<<y<< endl;
#define trace3(x, y, z)              cout <<#x<<": "<<x<<" | "<<#y<<": "<<y<<" | "<<#z<<": "<<z<<endl;
#define trace4(a, b, c, d)           cout <<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<endl;

typedef long long ll;
typedef long double lld;

template<typename T, typename U> inline void amin(T &x, U y) { if(y < x) x = y; }
template<typename T, typename U> inline void amax(T &x, U y) { if(x < y) x = y; }

ll powmod(ll a,ll b) {ll res=1;a%=MOD; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%MOD;a=a*a%MOD;}return res;}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    ll n;
    cin>>n;
    lld nn=d;
    cout<<(nn*6.28318530717958623200);
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:39:12: error: 'd' was not declared in this scope
   39 |     lld nn=d;
      |            ^
Language: C

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

int main() {
  int R;
  cin >> R;
  double l = R * 3.141592 * 2;
  cout << l << endl;
}

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

#include <iostream>
#define PI 3.14159265359
using namespace std;
int main()
{
double r;
cin>>r;
printf("%.6f",2*PI*r);

    
}

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

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using ull = unsigned long long;
using P = pair<int, int>;
const int INF = 1e9;

const double PI = 3.141592653589;

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


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

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

int main(){
    int n; cin >> n;
    cout <<　fixed << setprecision(16) << (double)2*M_PI*n << endl;
    return 0;
}

Compiler output:
a.cc:6:12: error: extended character 　 is not valid in an identifier
    6 |     cout <<　fixed << setprecision(16) << (double)2*M_PI*n << endl;
      |            ^
a.cc: In function 'int main()':
a.cc:6:12: error: '\U00003000fixed' was not declared in this scope
    6 |     cout <<　fixed << setprecision(16) << (double)2*M_PI*n << endl;
      |            ^~~~~~~
Language: C

#include<bits/stdc++.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()
{
    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

#include <stdio.h>
#include <algorithm>
#define rep(i,n) for(int i=0; i<n; ++i)

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:2:10: fatal error: algorithm: No such file or directory
    2 | #include <algorithm>
      |          ^~~~~~~~~~~
compilation terminated.
Language: C

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

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

#include<bits/stdc++.h>
#define rep0(i,n) for(i=0;i<n;i++)
#define rep(i,n) for(i=1;i<=n;i++)
#define reps(i,a,n) for(i=a;i<=n;i++)
#define mem(ara,n) memset(ara,n,sizeof(ara))
#define memb(ara) memset(ara,false,sizeof(ara))
#define all(x) (x).begin(),(x).end()
#define fast ios_base:: sync_with_stdio( false ); cin.tie(0); cout.tie(0);
#define eb              emplace_back
#define em              emplace
#define pb              push_back
#define Mp              make_pair
#define ff              first
#define ss              second
#define mod 1000000007
# define M_PI          3.141592653589793238462643383279502884L
typedef long long ll;
using namespace std;

const int M = (int)(2e6 + 239);

int getnum(string a)
{
    int i,p=0;
    rep0(i,a.size())
    {
        p*=10;
        p+=a[i]-'0';
    }
    return p;
}

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

    double a;
    cin>>a;
    a = 2*M_PI*a;
    printf("%.10f\n",a);
}


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 N 100100
#define SIGMA 26

int main()
{
    long double R;
    cin >> R;
    cout << 2.0 * R * M_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

#define _GLIBCXX_DEBUG
#include<bits/stdc++.h>
#define rep(i,n) for (int i = 0;i < (n);i++)
#define all(v) v.begin(),v.end()
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
using vl = vector<ll>;
using vvl = vector<vl>;

ll gcd(ll a,ll b){
  if(b == 0) return a;
  return gcd(b , a % b);
}

ll mod(ll a){
  return a % 1000000007;
}

ll lcm(ll a,ll b){
  return (a*b)/gcd(a,b);
}


int main(){
  ll r; cin >> r;
  cout << double(3.1415)*2*r << endl;
}

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

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

int main() {
int x;
  cin>>x;
  
  cout<<6.23818*x<<endl;

  
}


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

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

typedef long long ll;

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

    cout<<setprecision(6)<<fixed;
    cout<<ans<<endl;
    return 0;
}

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

#include <bits/stdc++.h>
 
using namespace std;
 
#define pii pair<int,int>
#define ll long long
#define s second
#define f first
 
double r;
 
int main(){
  cin >> r;
  cout << setprecision(10) << r*2*acos(-1) << 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 <algorithm>
#include <cmath>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <string>
#include <queue>
#include <numeric>
#include <ctype.h>
#include <limits>
#include <iomanip>

#define rep(i,n) for (int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
using namespace std;

typedef long long ll;

int main()
{
	int r;
	cin >> r;
	cout << 2 * r * acos(-1);
	return 0;
}

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

#include<iostream>
#include<cmath>
#define pb push_back
#define en "\n"
#define MOD 1000000007
const double PI  =3.141592653589793238463;
using namespace std;
int main() {
	ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
	int t=1;
	//cin >> t;
	while (t--) {
		float n;
		cin>>n;
		cout<<2*M_PI*n<<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 <iostream>
#include <vector>
#include <cstdio>
#include <string>
#include <cmath>
#include <algorithm>
#include <climits>
#define ll long long
#define MAX 25 * 1e13
#define N  200010

#define SIZE(A) ((int)A.size())
#define LEN(A) ((int)A.length())
#define MP(A,B) make_pair(A,B)
#define PB(X) push_back(X)
#define EB(X) emplace_back(X)
#define REP(i,a) for(int i=0;i<(a);++i)
#define rep(i, n) for (int i = 0; i < (n); i++)
#define repr(i, n) for (int i = (n) - 1; i >= 0; i--)
#define range(a) a.begin(), a.end()
#define VI vector<int>;

using namespace std;
int MOD = 1000000007;


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

  int n;
  cin >> n;
  double ret = (double)2.0 * 3.141592653 * n;
  cout << ret << 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>
#define pb push_back
#define mp make_pair

using namespace std;

const int INF = 2000000000;
const double pi = 3.1415926;
const int base = 1000000007;

double n;

int main()
{
//    ifstream cin ("house.in");
//    ofstream cout ("house.out");
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cout.precision(25);
    cout.setf(ios_base::fixed);
    cin >> n;
    cout << 2 * pi * n;
    return 0;
}


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

#include <iostream>
#include <cstring>
#include <cmath>
#include <vector>
#include <algorithm>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <set>
#include <map>
#include <iterator>
#include <stack>
#include <string.h>
#include <cstdlib>
#include <queue>
#include <list>

using namespace std;

int main()
{
    int r;
    cin >> r;
    cout << 2*r*3.14159 << 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>
//#pragma GCC optimize("Ofast","no-stack-protector","unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.2,popcnt,abm,mmx,avx")
//#include<bits/extc++.h>
//using namespace __gnu_pbds;
using namespace std;
#define F(i,L,R) for(int i=L;i<R;++i)
#define FE(i,L,R) for(int i=L;i<=R;++i)
#define getI(a) scanf("%lf", &a)
#define getII(a,b) scanf("%d%d", &a, &b)
#define getIII(a,b,c) scanf("%d%d%d", &a, &b, &c)
#define VgetI(n) int (n); scanf("%d",&(n))
#define VgetII(n,m) int (n),(m); scanf("%d %d",&(n),&(m))
#define VgetIII(n,m,k) int (n),(m),(k); scanf("%d %d %d",&(n),&(m),&(k))
#define debug(x) cout<<(#x)<<"="<<x<<"\n";
#define qq cout<<"QQ\n";
#define pb push_back
#define pii pair<int,int>
#define mp make_pair
#define f first
#define s second
#define ll long long
#define INF 2000000000
#define pi 3.14159265359
int main(){
	double r;
	while(~getI(r)){
		printf("%.6lf\n",pi*2*r);
	}
}


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

#include<bits/stdc++.h>
#define ll long long
using namespace std;
#define mk  make_pair
#define pb  push_back
#define pi 3.141592653589793238

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);

    double n;
    cin>>n;
    double ans=2*pi*n;
    cout<<fixed<<setprecision(20)<<ans<<endl;
    return 0;
}


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

#include<iostream>
#include<iomanip>

using namespace std;
static const double Pi = 3.141592;

int main(){
    double r;
    cin >> r;
    cout << fixed << setprecision(4) << 2 * Pi * r << endl;
    return 0;
}

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

#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>
#include<map>
#include<set>

using namespace std;

#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 ALL(a) (a).begin(),(a).end()
#define PI 3.141592653589793238
#define INF 1050000000
#define INFL (long long)(4e18)

using vi = vector<int>;

template<class T>
struct Edge {
	int to;
	T cost;
	Edge() {};
	Edge(int to, T cost) : to(to), cost(cost) {};
};

template<class T>
class Graph {
	int n;
	bool directed;
	vector<vector<Edge<T>>> edges;
public:

	Graph(int n, bool directed) :n(n), directed(directed), edges(vector<vector<Edge<T>>>(n)) {};
	Graph() {};

	void add(int to, T cost) {
		emplace_back(to, cost);
	}

	int size() {
		return n;
	}
};


int main() {

	double R;

	cin >> R;

	cout << fixed << setprecision(15) << R*2.0*PI << endl;

	return 0;
}

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

//#define _USE_MATH_DEFINES
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <vector>
using namespace std;

#define PI = 3.1415

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

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