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

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

int main(){
    std::ios_base::sync_with_stdio(false);
	std::cin.tie(NULL);
    int n;
    double ans;
    cin>>n;
    ans=n*2*3.14159265359;
    cout<<ans<<endl;
}

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

#include<bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define F first
#define S second
#define MOD	1000000007
#define int	long long
#define pii pair<int,int> 
#define vi vector<int>
using namespace std;

int power(int a, int b){ int S = 1; while(b--)S *= a; return S;}

int32_t main(){
	double r;
	cin >> r;
	cout << 2 * 3.14159265358979323846 * r;
	return 0;
}



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

#include<bits/stdc++.h>
#define ld long double
using namespace std;
#define PI 3.1416

int main(){
    ld R;
    cin >> R;
    R *= (ld)2.0*(ld)3.1416;
    cout << setprecision(12) << R << "\n";
    return 0;
}


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

//Author : Sidiq Tri Pratikto
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pb push_back
#define fi first
#define se second
#define mp make_pair
#define all(v) v.begin(), v.end()

using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> new_data_set;
//order_of_key(x) = number of elements stricly smaller than x
//find_by_order(x) = return x-th largest element
typedef long long LL;
const LL MOD = 998244353;
const double PI = 2 * acos(0);

int main() {
	int R;
	scanf("%d", &R);
	printf("%.2f\n", 2 * R * PI);
}

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 <cstdio>
#include <iostream>
#include <iomanip>
#include <queue>
#include <set>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <complex>

using ll = long long int;
using namespace std;

int main(){
  double pi = 6.28318530717958623200;
  ll R;
  cin >> R;

  cout << setprecision(15) << R * pi << endl;

  return 0;
}


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

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

template <class T>
bool INRANGE(T x, T a, T b) { return a <= x && x <= b; }
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;
}

#define REP(i, n) for (int i = 0; i < (n); ++i)
#define RREP(i, n) for (int i = (n); i >= 0; --i)
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define RFOR(i, a, b) for (int i = (a); i >= (b); --i)
#define ALL(v) (v).begin(), (v).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" \
                      << " " << __FILE__ << endl;

typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<vi> vvi;
typedef pair<int, int> pii;

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

    double r;
    cin >> r;

    cout << setprecision(20)  << r*2.*3.1415926535 << 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()
{
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    long long r;
    cin>>r;
    double ans;
    ans=2*3.14159265358979323846*r;
    cout << fixed << setprecision(20) << ans <<endl;
    return 0;
}


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

using System;
using System.Linq;
using System.Collections.Generic;

using E = System.Linq.Enumerable;

public class Program
{
    public static void Main()
    {
        var r = int.Parse(Console.ReadLine());

        Console.WriteLine(2 * Math.PI * r);
    }
}


Compiler output:
main.c:1:1: error: unknown type name 'using'
    1 | using System;
      | ^~~~~
main.c:2:1: error: unknown type name 'using'
    2 | using System.Linq;
      | ^~~~~
main.c:2:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | using System.Linq;
      |             ^
main.c:3:1: error: unknown type name 'using'
    3 | using System.Collections.Generic;
      | ^~~~~
main.c:3:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    3 | using System.Collections.Generic;
      |             ^
main.c:5:1: error: unknown type name 'using'
    5 | using E = System.Linq.Enumerable;
      | ^~~~~
main.c:5:17: error: request for member 'Linq' in something not a structure or union
    5 | using E = System.Linq.Enumerable;
      |                 ^
main.c:7:1: error: unknown type name 'public'
    7 | public class Program
      | ^~~~~~
main.c:7:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Program'
    7 | public class Program
      |              ^~~~~~~
Language: C

#include <iostream>
#include <cmath>

using namespace std;

int main() {
    double N;
    cin >> N;
    cout << N*M_PI << endl;


    return 0;
    
}

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

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <cmath>
#include <map>
#include <numeric>
#include <set>
#include <iomanip>
#include <functional>
#include <math.h>
#define FOR(i, a, n) for (long long i = (a); i < (n); i++)
#define REP(i, n) for(long long i = 0; i < (n); i++)
#define ALL(obj) (obj).begin(), (obj).end()
#define pb push_back
using namespace std;

typedef long long ll;

long long Mygcd(long long a, long long b)
{
	if (a % b == 0)return b;
	return Mygcd(b, a % b);
}

int Mygcd(int a, int b)
{
	if (a % b == 0)return b;
	return Mygcd(b, a % b);
}

long long Mylcm(long long a, long long b)
{
	return a * b / Mygcd(a, b);
}

int Mylcm(int a, int b)
{
	return a * b / Mygcd(a, b);
}

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

	double R;

	cin >> R;

	double PI = 3.14159265358979323846;

	cout << std::fixed << std::setprecision(20) << 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

#include <bits/stdc++.h>
#include <ext/pb_ds/detail/standard_policies.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long int ll;
typedef unsigned long long int ull;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> o_set; 

#define     int                 ll
#define     pb                  push_back
#define     mp                  make_pair
#define     xx                  first
#define     yy                  second    
#define     all(a)              a.begin(),a.end()
#define     vi                  vector<int>
#define     vpi                 vector<pii>
#define     pii                 pair<int, int>
#define     present(DT, val)    (DT.find(val) != DT.end()) //for set and map
#define     cpresent(DT, val)   (find(all(DT),val) != DT.end()) //vectors
#define     input               "/home/pollution/Desktop/WorkSpace/C++/Files/input.txt"
#define     output              "/home/pollution/Desktop/WorkSpace/C++/Files/output1.txt"
#define     error               "/home/pollution/Desktop/WorkSpace/C++/Files/error.txt"
#define     IO()                ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define     INF                 2e18
#define     MOD                 1000000007
#define     clr(x)              memset(x, 0, sizeof(x))
#define     init(x, a)          memset(x, a, sizeof(x))
#define     out(a)              for (auto i: a) cout<<i<<' '; cout<<'\n'
#define     cpy(a,b)            memcpy(a,b,sizeof(b))
#define     is(a)               to_string(a)
#define     ci(a,c)             a-c
#define     db(i)               cout<<"point :"<<i<<'\n';
#define     setd(val,n)         cout<<fixed<<setprecision(n)<<val<<'\n'
#define M_PI           3.14159265358979323846

void solve(){
 	double r; cin>>r;   
 	setd(2*M_PI*r, 20);
}

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

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

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

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

#define PI 3.141592
int main()
{
  int R; cin >> R;
  cout << 2.0*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

r=int(input())
print(2*r*3.141592)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | r=int(input())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'r' [-Wimplicit-int]
main.c:1:3: error: expected expression before 'int'
    1 | r=int(input())
      |   ^~~
Language: C

import math
r=int(input())
print(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>
#define fr(i,n) for(ll i=0;i<n;i++)
#define ll long long
#define pb push_back
#define endl "\n"
#define mod 1000000007
using namespace std;
int main()
{
	int r;
	cin>>r;
	double pi = 3.14159;
	double c=2*pi*r;
	cout << fixed << setprecision(2) << c <<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>
#include <utility>


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

int main( void )
{
	ll r;

	cin >> r;

	cout << (2 * r *3.1415926535) << endl;

	return 0;
}


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

#include <iostream>

# define M_PI 3.14159265358979323846
using namespace std;
double pi,r;
int main()
{   pi=3.14;
    cin>>r;
    cout<<2*M_PI*r;
    return 0;
}


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

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

#include<iostream>
#include<stdio.h>
#include<vector>
#include<stdlib.h>
#include<set>
#include<string>
#include<queue>
#include<map>
#include<cmath>

#define INF INT_MAX
#define UINF UINT_MAX
#define MOD 1000000007
#define REP(i,n) for(int i=0;i<n;i++)
#define all(x) (x).begin(),(x).end()

typedef long long ll;
typedef std::pair<int,int> pii;

using namespace std;

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

    double n;
    cin >> n;

    double ans = n*2*M_PI;

    cout << ans << 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;
#define ll long long
#define ld long double
#define mod 1000000007
#define f(i,a,b) for(ll i=a;i<b;i++)
#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ii pair<ll,ll>
#define vii vector<ii>
#define F first
#define S second
#define pb push_back
#define mp make_pair
#define MAX 1e9
 
ll modpow(ll base, ll exp, ll modulus) {base %= modulus;ll result = 1;while (exp > 0) {if (exp & 1) result = (result * base) % modulus;base = (base * base) % modulus;exp >>= 1;}return result;}
const ld pi=acos(-1);


int main(){
    IOS;
    ld r;cin>>r;
    ld ans=2*pi*r;
    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>
#define int long long
#define f first
#define s second
using namespace std;
int32_t main(){
    if(fopen("input.txt", "r"))
    freopen("input.txt", "r", stdin),
    freopen("output.txt", "w", stdout);
    ios::sync_with_stdio(0),cin.tie(0);
    long double r;
    cin >> r;
    long double pi=M_PI;
    cout << setprecision(20) << 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>
#include <vector>
#include <iostream>
#include <map>
#include <cmath>
#include <string>
using namespace std;

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

#define PI 3.14
typedef long long ll;


ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
ll lcm(ll c, ll d) { return c / gcd(c, d) * d; }

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

  cout << 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<bits/stdc++.h>
using namespace std;
#define ll  long long
#define FASTINOUT ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const ll mod = 1e9+7;
const int N=1e7+9;
int main()
{
    FASTINOUT;
    ll x;
    cin>>x;
    cout<<fixed<<setprecision(6)<<2*3.141592*x<<"\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;
typedef long long ll;
typedef long int lt;
typedef vector<ll> vi;
typedef vector<int> vin;
typedef pair<ll,ll> pll;
typedef pair<int,int> pin;
#define all(a) a.begin(),a.end()
#define rep(i,a,b) for(int i=a;i<b;++i)
#define f(i,b) for(int i=0;i<b;++i)
#define per(i,a,b) for(int i=a;i>=b;--i)
#define test(t) int t; cin>>t; while(t--) solve()
#define endl "\n"
#define p1 cout<<"YES"<<endl
#define p0 cout<<"NO"<<endl
#define fst ios::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)

int main()
{
    double r;
    cin>>r;
    r*=2;
    r*=3.14159265358979;

    cout<<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<iostream>
#include<vector>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
int main() {
    ll a;
    cin >> a;
    double d = 3.1415926535897;
    cout << 2 * a * d << 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;
using vi = vector<int>;
using vii = vector<vi>;
using vs = vector<string>;
using in6 = int64_t;
using ind = double;
using pii = pair<int,int>;
using psi = pair<string,int>;
using vpi = vector<pii>;
using vps = vector<psi>;
#define rep(i, n) for (in6 i = 0; i < (in6)(n); i++)
#define repa(i,a,n) for(in6 i = a; i < (in6)(n); i++)
#define repdown(i,n) for(in6 i = n; i > 0; i--)
#define kyun ios::sync_with_stdio(false)
#define hinata cout << "\n"
#define all(c) (c).begin(), (c).end()
#define pb push_back
#define inf 2147483647
#define dset(n) cout << fixed << setprecision(n)
#define PI 3.14159265359

void yes() {
  cout << "Yes";
}

void no() {
  cout << "No";
}

int main() {
  kyun;
  int a;
  cin >> a;
  cout << 2*a*PI;
hinata;
}

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<stdlib.h>
 int main()
  {  double n;
      scanf("%lf",&n);
      printf("%.7f\n",2*n*mod);
   } 

Compiler output:
main.c: In function 'main':
main.c:6:27: error: 'mod' undeclared (first use in this function)
    6 |       printf("%.7f\n",2*n*mod);
      |                           ^~~
main.c:6:27: 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 ull unsigned long long

int main()
{
	const double PI = 3.1415926535897932384626433832795028;
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	double n;
	cin >> n;
	cout << PI*2*n;
}

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

#include <bits/stdc++.h>

using namespace std;

int main() {
    double PI=3.1415926535897932;

    int R;
    cin >> R;

    double res = 2 * R * PI;

    cout << res << 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 <stdio.h>
double r, a;
scanf(%lf,&r);
	
    a = 2*3.14*r;
    
    printf(a,&a);

Compiler output:
main.c:3:7: error: expected declaration specifiers or '...' before '%' token
    3 | scanf(%lf,&r);
      |       ^
main.c:3:11: error: expected declaration specifiers or '...' before '&' token
    3 | scanf(%lf,&r);
      |           ^
main.c:5:5: warning: data definition has no type or storage class
    5 |     a = 2*3.14*r;
      |     ^
main.c:5:5: error: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
main.c:5:5: error: conflicting types for 'a'; have 'int'
main.c:2:11: note: previous declaration of 'a' with type 'double'
    2 | double r, a;
      |           ^
main.c:7:14: error: expected ')' before '&' token
    7 |     printf(a,&a);
      |              ^
      |              )
Language: C

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

typedef long long ll;
using namespace std;

int pot (ll q, ll w){
	ll qw = q;
	q = 1;
	for (int i = 0; i<w; i++)
		q*= qw;
	return q;
}

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

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






return 0;
}



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

/*
AuThOr GaRyMr
*/
#include<bits/stdc++.h>
#define rb(a,b,c) for(int a=b;a<=c;++a)
#define rl(a,b,c) for(int a=b;a>=c;--a)
#define LL long long
#define IT iterator
#define PB push_back
#define II(a,b) make_pair(a,b)
#define FIR first
#define SEC second
#define FREO freopen("check.out","w",stdout)
#define rep(a,b) for(int a=0;a<b;++a)
#define KEEP while(1)
#define SRAND mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define random(a) rng()%a
#define ALL(a) a.begin(),a.end()
#define POB pop_back
#define ff fflush(stdout)
#define fastio ios::sync_with_stdio(false)
#define debug_pair(A) cerr<<A.FIR<<" "<<A.SEC<<endl;
using namespace std;
const int INF=0x3f3f3f3f;
typedef pair<int,int> mp;
typedef pair<mp,mp> superpair;
int main(){
//	fastio;
	double pi=3.1415926535897932384626433832795;
	double n;
	cin>>n;
	printf("%.10f\n",n*2.0*pi);
	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: Java

//package AtCoder_163;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

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


Compiler output:
Main.java:8: 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>
#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<<fixed<<setprecision(12)<<endl;
    return 0;
}


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

#include<bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
#define SZ(x) ((int)(x).size())
using namespace std;
using lint = long long;//
template <typename T>
T sq (T x) {
    return x * x;
}

signed main () {
    lint  R;
    cin >> R;
 cout <<   2. * M_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 <stdlib.h>
#include <string.h>
#include <math.h>


int compare_int(const void *a, const void *b)
{
    return *(int*)a - *(int*)b;
//    return *(long long*)a - *(long long*)b;
}
//  qsort(A, b, sizeof(int), compare_int);

//long long  factorial(long long n) {
//    if (n > 0) {
//        return n * factorial(n - 1);
//    } else {
//        return 1;
//    }
//}
long long  factorial(long long n, long long depth) {
    if (n > 1) {
        depth++;
        return factorial(n / 2, depth);
    } else {
        return depth;
    }
}

int min(int a, int b) {
    if (a > b)
        return b;
    else
        return a;
}

int distance(int a, int b) {
  return abs(a-b)*abs(a-b);
}



//int ()
/*
int triangle(int a, int b, int c){
  if(a<b+c){
    if(b<c+a){
      if(c<a+b){
        printf("1\n");
        return 1;
      }
    }
  }
  printf("1\n");
  return 0;
}
*/

int main()
{
//  int  a, b, c, d, e, X, Y ,r;
  unsigned double  a, b, c, d, e, X, Y;
  //  double  c;
// long long  A[200003]={};
  int  A[200003]={};
  int  B[100003]={};
//  int  C[100003][100001]={};
  int  C[100003]={};

  int  flg=0;

//  char s[101][101]={};
  char s[100001]={};
  char t[100001]={};
//  int N, M;
//  int A[1000000001]={};
//  long long  C[101]={};
  int i,j,k;
  long long p=0,q=0;
  int sosuu[46] ={2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199};
  int min =100000001;
  int len=0;
  int l=0;
  int cnt=0;
  int num=0;
  int num1=0;
  int num2=0;
  long long  ans=0;
  int ans_ac=0;
  int ans_wa=0;
  int max=0;
  long long sum=0;
  int addr=0;
  int ptn=0;
  int  tmp=0;
  double per=0; 
//  bool on_off[100]={};
  
//  char alp[26]={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};

  //  a=0;
  scanf("%llf", &a);
  printf("%llf\n", 3.14*2*a);
  
return 0;
}


Compiler output:
main.c: In function 'main':
main.c:62:12: error: both 'unsigned' and 'double' in declaration specifiers
   62 |   unsigned double  a, b, c, d, e, X, Y;
      |            ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
double pi=acos(-1);
int main()
{
	double r;
	cin>>r;
	cout<<fixed<<setprecision(9)<<(2*pi*r)
	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:47: error: expected ';' before '}' token
    8 |         cout<<fixed<<setprecision(9)<<(2*pi*r)
      |                                               ^
      |                                               ;
    9 | 
   10 | }
      | ~
Language: Java

import java.util.*;
public class Main  {
   public static void main(String[] args)  {
      Scanner sc = new Scanner(System.in);
      
      double r = sc.next();
            
      System.out.println(2 * r * 3.141592);
      
   }   
}


Compiler output:
Main.java:6: error: incompatible types: String cannot be converted to double
      double r = sc.next();
                        ^
1 error
Language: C

import math

n=float(input())


print(n*2*math.pi)

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

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int r;
	cin>>r;
	double a,pi;
	pi=acos(-1);
	a=2*pi*r;
	  cout << fixed;
 cout <<setprecision(20) << a<< '\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 ll long long int
const ll MOD = 1e9 + 7;
using namespace std;
ll powmod(ll a, ll b, ll MOD = MOD){
    if(!a and !b)	return 1ll;
    if(!a)	return a;
    ll res = 1ll;
    b %= (MOD - 1ll), a %= MOD;
    while(b){
        if(b%2 == 1)	res = (res * a) % MOD;
        a = (a * a) % MOD;
        b /= 2;
    }
    return res;
}
void panda() {
    long double r;
    cin>>r;

        cout<<setprecision(2)<<fixed<<2*(3.14)*r<<"\n";



}
int main() {
    panda();
    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;


int main()
{
    cin.tie(0);
    ios::sync_with_stdio(0);
    long double PI = 3.141592653589793238;
    int r;
    cin >> r;

    cout << setprecision(10) << fixed;
    cout << 2*r*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 <bits/stdc++.h>
using namespace std;
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

#include <stdio.h>
#include <iostream>
#include <cstdlib>
#include <vector>
#include <queue>
#include <math.h>
#include <string> 
#include <bits/stdc++.h>
using namespace std;

int main(){
    double r;
    cin >> r;
    cout << r*2*3.141592 << 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;
int main() 
{
	int x;
	cin>>x;
	cout<<x*2*3.14159265;
}

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

Var r:Longint;
Begin
    Readln(r);
    Writeln(r*2*3.14);
End.

Compiler output:
main.c:1:1: error: unknown type name 'Var'
    1 | Var r:Longint;
      | ^~~
main.c:1:6: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
    1 | Var r:Longint;
      |      ^
main.c:2:1: error: unknown type name 'Begin'
    2 | Begin
      | ^~~~~
main.c:3:5: error: parameter names (without types) in function declaration [-Wdeclaration-missing-parameter-type]
    3 |     Readln(r);
      |     ^~~~~~
main.c:4:13: error: unknown type name 'r'
    4 |     Writeln(r*2*3.14);
      |             ^
main.c:5:4: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    5 | End.
      |    ^
Language: C

#include<bits/stdc++.h>
using namespace std;
int main(){
	int r;
	cin>>r;
	
	double R;
	R=r;
	R*=3.1415926*2;
	cout<<R;
	return 0;
}

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

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

int main() {
  int R;
  cin >> R;
 cout << 2*R*3.141 << 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++

v#include <bits/stdc++.h>
using ll = long long;
using namespace std;
#define rep(i, n) for (int i = 0; i < n; i++)
#define reprev(i, n) for (int i = n - 1; i >= 0; i--)

int main(){
  double R, answer;
  cin >> R;
  answer = 2 * R * 3.14;
  cout << answer << 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:9:3: error: 'cin' was not declared in this scope
    9 |   cin >> R;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | v#include <bits/stdc++.h>
a.cc:11:3: error: 'cout' was not declared in this scope
   11 |   cout << answer << endl;
      |   ^~~~
a.cc:11:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:11:21: error: 'endl' was not declared in this scope
   11 |   cout << answer << endl;
      |                     ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | v#include <bits/stdc++.h>
Language: C

#include <iostream>
#include <string.h>
#define PI 6.28318530717958623200
int main()
{
	long long int a;
  cin>>a;
  cout<<fixed()<<setprecision(20)<<a*PI*2*1.0;
}


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;
using ll = long long;

const double PI=3.14159265358979323846;

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

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

#include <stdio.h>

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

Compiler output:
main.c: In function 'main':
main.c:7:22: error: 'R' undeclared (first use in this function)
    7 |   printf ("%f", pi * R);
      |                      ^
main.c:7:22: note: each undeclared identifier is reported only once for each function it appears in
Language: C

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

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


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

#include<iostream>

using namespace std;

int main(){
	double x;
	double pi = 3.1415926535;
	cin>>x;
	cout<<2 * pi * x;

	
}

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>
const double PI=3.14159265358979323846;
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
int main(void){
    int r;cin>>r;
    co(2*r*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 <stdio.h>
#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:2:10: fatal error: bits/stdc++.h: No such file or directory
    2 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
using namespace std;
#define pi 3.14159265358979323846

int main(){
  ios_base::sync_with_stdio(false);
  int n;
  cin>>n;
  double ans = 2*pi*n;
  cout<<setprecision(15);
  cout<<fixed;
  cout<<ans<<endl;
  

}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:9: error: 'setprecision' was not declared in this scope
   10 |   cout<<setprecision(15);
      |         ^~~~~~~~~~~~
a.cc:2:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    1 | #include <iostream>
  +++ |+#include <iomanip>
    2 | using namespace std;
Language: C

#include <bits/stdc++.h>
#include <set>
#define rep(i,n) for (int i=0; i < (n); ++i)
#define all(a) a.begin(), a.end()
using ll = long long;
using namespace std;
 
// ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }


const double PI = acos(-1);

int main() {
  ll r; cin >> r;
  double ans = 2*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;
const double PI=3.14159265358979323846;
double n;
int main()
{
  cin>>n;cout<<2*n*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<stdio.>
int main()
{
  int R,C;
  scanf("%d",&R);
  C=2*pi*R;
  printf("%d",C);
  return 0;
}
  

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

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

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

/*  TAHMID RAHMAN
    DAMIAN FOREVER
     MATH LOVER
    NEVER GIVE UP
*/
#include<bits/stdc++.h>
using namespace std;
#define pi acos(-1.0)
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define ll long long
#define pb push_back
#define fi first
#define se second
#define in insert
#define mp make_pair
#define gcd(a,b) __gcd(a,b);
int main()
{
    fastio;
    double ans,r,p=3.1416;
    cin>>r;
    ans=p*r*2;
    cout<<ans<<endl;

}


Compiler output:
main.c:6:9: fatal error: bits/stdc++.h: No such file or directory
    6 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<stdio.h>

int main(void) {
	int r;

	scanf_s("%d", &r);
	printf("%f", r * 6.283185);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:9: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    6 |         scanf_s("%d", &r);
      |         ^~~~~~~
      |         scanf
Language: C

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

int main() {

  int R;
  double pi ;
  cin >> R;

  pi = pi = 4 * atan(1) ;

  cout << 2.0*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>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

#define ff              first
#define ss              second
#define int             long long
#define pb              push_back
#define mp              make_pair
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pq              priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define mod             1000000007
#define inf             1e18
#define ps(x,y)         fixed<<setprecision(y)<<x
#define mk(arr,n,type)  type *arr=new type[n];
#define w(x)            int x; cin>>x; while(x--)
mt19937                 rng(chrono::steady_clock::now().time_since_epoch().count());

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds;


void c_p_c()
{
	ios_base::sync_with_stdio(0); 
	cin.tie(0);
	cout.tie(0);
/*
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
*/
}

int32_t main()
{
	c_p_c();
/*	w(t)
	{
	}
	 */
	 int r;
	 cin>>r;
	 double ar= 3.1415926535*r*2;
	 cout<<ar<<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

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

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

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




int main()
{
	int r;

	cin >> r;
	
	cout << 2 * r * 3.14159265358979323846264338327950288;

}




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

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

int main(){
  double r;
  cin >> r ;
  double pi = 3.14159265;
  cout << fixed << setprecision(10);
  cout << 2*r*pi << 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

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

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

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

    cout << 2*3.141592654*r << endl;

    return 0;
}


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

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

double a=22.0/7.0,r;
cin>>r;
cout<<r*a*2;
}

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

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

int main(){
    float n;
    float pi=3.1415;
    cin>>n;
    float ans= 2*n*pi;
    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;

int main()
{
 int R;
  cin>>R;
  ans=R*6.28;
  cout<<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>
#include<math.h>
using namespace std;
int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long n, i, s = 0, t, p, l, b;
  cin >> t;
  cout <<(double) 2 * t * 3.14159265358979323846;
  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;
long long r;
long double x;
int main (){
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
scanf("%lld",&r);
x=(double)314159265/(double)100000000;
printf("%Lf",2*x*r);
return 0;
}


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

//
//  main.cpp
//  HelloWorld
//
//  Created by purple on 2020/04/13.
//  Copyright © 2020 Purple. All rights reserved.
//

#include <iostream>
#include <algorithm>
#include <string>
#include <fstream>
#include <regex>

using namespace std;

int main(int argc, const char * argv[]) {
    // insert code here...
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    #define PI 3.14159265359


    
    int r;
    
    cin >> r;
    
    cout << 2*r*PI;
    
    return 0;
    
}


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

#include<iostream>
using namespace std;
int main() {
	double a; cin >> a;
    cout << fixed << setprecision(12) << 2.0 * (22.0/7.0) * a ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:22: error: 'setprecision' was not declared in this scope
    5 |     cout << fixed << setprecision(12) << 2.0 * (22.0/7.0) * a ;
      |                      ^~~~~~~~~~~~
a.cc:2:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    1 | #include<iostream>
  +++ |+#include <iomanip>
    2 | using namespace std;
Language: C

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

int main() {
  double R;
  cin >> R;
  cout << 2*3.141592653589*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;
//FILE *fi=freopen("1.txt","r",stdin);
double r = 3.1415;
int main()
{
    double R;
    cin>>R;
    printf("%.2f",2.0*R*r);
    return 0;
}


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

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

#ifdef _MSC_VER
#pragma warning(disable:4996)
#endif

using namespace std;


int main() {
	double pi = acos(-1);

	double a;
	scanf("%lf", &a);
	printf("%f", a*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>
using namespace std;
int main()
{   ios_base::sync_with_stdio(0);
    cin.tie(0);
    const double pi = 3.14159265358979323846;
    long long r;
    cin >> r;
    cout << 2*pi*r <<endl;
    return 0;
}

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

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

int main(){

    double n,ans=0;
    cin >> n;
    ans = n * 2 * 3.1415;
    cout << std::fixed << std::setprecision(8) << 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<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(void)
{
	double n;
	scanf("%lf",&n);
	printf("%.3lf",n*3.1415926535*2.0);
}

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;
  double pi = 3.141592654;
  cin >> r;
  r *= 2;
  cout << fixed << setprecision(10);
  cout << 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 <iostream>
#include <math.h>
#include <vector>
#include <map>
#include <algorithm>
#include <deque>
#include <string>
#define _USE_MATH_DEFINES
#define pb push_back
#define f first
#define s second
#define mp make_pair
#define fors(i, a, b) for(int i = a; i < b; i++)
#define for(i, n) for(int i = 0; i < n; i++)
using namespace std;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<pair<int, int> > vpi;
typedef vector<pair<string, int> > vpsi;
typedef map<string, int> msi;
int main()
{
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    cout << 2 * n * M_PI << endl;
}

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

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

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

#include <bits/stdc++.h>
#include <math.h>
using namespace std;
#define rep(i,n) for (int i=0;i<(n);i++)
typedef long long ll;
bool aaa[11111111];
const int dx[4]={1,0,-1,0};
const int dy[4]={0,1,0,-1};
ll gcd(ll a, ll b) {
  if(a < b) return gcd(b, a);
  unsigned r;
  while ((r=a%b)) {
    a = b;
    b = r;
  }
  return b;
}
 
 
int main() {
  ll a;
  float x1,x2,bx,b=50000.0001,c=5;
  double xx1,xx2,bx,aa,cc;
  aa=3.1415926535;
  cin>>xx1;
  cout<<fixed<<xx1*aa;
  //vector<vector<bool>> sinsetsu(15,vector<bool>(14)),usotsuki(15,vector<bool>(14));
  //vector<vector<int>> sss(15,vector<int>(14))
  //vector<vector<int>> sss(h,vector<int>(w));
  //vector<int> a(k),b(k);
  //char x;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:18: error: conflicting declaration 'double bx'
   23 |   double xx1,xx2,bx,aa,cc;
      |                  ^~
a.cc:22:15: note: previous declaration as 'float bx'
   22 |   float x1,x2,bx,b=50000.0001,c=5;
      |               ^~
Language: C

#include <bits/stdc++.h>
using namespace std;
const double PI=3.14159265358979323846;

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

cout << A*PI*2 << endl;
 
}


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