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

/*  
    tanuj_johal :: gla_clg_sync_with_CSE(true);
    bonding.tie(true);
    hardwork.tie(true);
    
    ::::::::--------------------::::::::
*/

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

using namespace std;
using namespace __gnu_pbds;

#define ll          long long
#define fio         ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define pb          push_back
#define vi          vector<ll>
#define pp          push_pop
#define pll         pair<ll,ll>
#define in          insert
#define ff          first
#define ss          second
#define inf         10000000000000000
#define all(p)      p.begin(), p.end()
#define que_max     priority_queue <int>
#define que_min     priority_queue <int, vi, greater<int>>
#define print(a)    for(auto i:a){cout<<i<<" ";}
#define print1(a)   for(auto i:a){cout<<i.ff<<" "<<i.ss<<endl;}

typedef tree<pll, null_type, less<pll>, rb_tree_tag, tree_order_statistics_node_update> Set;


const ll mod = 1e9+7;

ll power(ll x,ll y,ll p){ll r=1;x=x%p;while(y>0){if(y&1)r=(r*x)%p;y=y>>1;x=(x*x)%p;}return r;}

void solve()
{
    unordered_map<ll,ll> mp;          set<ll> st; 
    ll n,m,k;
    string s;
    cin>>n;
    double pi = 6.28318530717958623200;
    pi = pi*(double)n;
    cout<<pi<<endl;




}

int main()
{
    fio
    // int t;cin>>t;while(t--)
    {
        solve();
    }
    
}


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

#include <cstdio>
using namespace std;
int main(){
	int a;
	scanf("%d",&a);
	printf("%.2f",6.28*a);
	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;
#define _GLIBCXX_DEBUG //これつけるとA[N]でもいいらしい
//for文のマクロ
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define big 1000000007
#define all(a) sort((a).begin(),(a).end()) //ソートのマクロ
#define Re(a) reverse((a).begin(),(a).end())
#define YN(a) if(a){cout<<"Yes"<<endl;}else cout<<"No"<<endl;//条件によってYes、Noを出力する
int main(){
    double r;
    cin>>r;
    cout<<2*r*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 <bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<=int(b);++i)
using namespace std;
template<class A>void pr(A a){cout << (a) << endl;}
template<class A,class B>void pr(A a,B b){cout << a << " "  ;pr(b);}
template<class A,class B,class C>void pr(A a,B b,C c){cout << a << " " ;pr(b,c);}
template<class A,class B,class C,class D>void pr(A a,B b,C c,D d){cout << a << " " ;pr(b,c,d);}
typedef long long ll;
typedef pair<ll, ll> l_l;
typedef pair<int, int> i_i;
int INF=numeric_limits<int>::max();
// for(int j=0;j<N;++j) {

int main(void) {
  int r;cin>>r;
  pr(r*2*3.1415926535);
  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

// Author : Sarthak Kapoor
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
#define rep(i,n) for(int i=0;i<n;++i)
#define repa(i,a,n) for(int i=a;i<n;++i)
#define repr(i,n) for(int i=n-1;i>=0;--i)
#define repba(i,b,a) for(int i=b;i>=a;--i)
#define repab(i,a,b) for(int i=a;i<b;++i)
#define ll long long
#define pi pair<int,int> 
#define pii pair<pi,int>
#define ull unsigned long long
#define vi vector<int>
#define viip vector<pair<int,pair<int,int> > > 
#define mp make_pair
#define vip vector<pair<int,int> >
#define pb push_back 
#define fi first
#define sec second
#define all(v) v.begin(),v.end()
#define s(v) v.size()
ll mod = 1000000007;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());//use rng()%n for numbers in range [0,n-1]
ll gcd(ll a,ll b){
	if(b==0)return a;
	return gcd(b,a%b);
}
ll fastexp(ll x,ll a){
    ll res = 1;
    while(a>0){
        if(a&1){
            res = (res*x)%mod;
        }
        a=a>>1;
        x=(x*x)%mod;
    }
    return res;
}
ll inverse(ll n){
    return fastexp(n,mod-2);
}
template <typename T>
void add(T &a, T b){
	a += b;
	if(a >= mod)a -= mod;
}
template <typename T>
void sub(T &a, T b){
	a -= b;
	if(a < 0)a += mod;
}
template <typename T>
void mul(T &a, T b){
	a *= b;
	if(a >= mod)a %= mod;
}
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	#ifndef ONLINE_JUDGE
    	freopen("input.txt", "r", stdin);
    	freopen("output.txt", "w", stdout);
	#endif
	int r;
	cin>>r;
	double ans = M_PI*2*r;
	cout<<fixed<<setprecision(12)<<ans;	
	return 0;
}

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

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define int long long
#define rep(i,n) for(int i = 0; i < (n); i++)
#define divup(a,b) ( ( (a) + ( (b) - 1u) ) / (b) ) // a/b の余り切り上げ
// #include <boost/multiprecision/cpp_int.hpp>
// using namespace boost::multiprecision;
ll mod = 1000000007;
ll mod9 = 1000000009;

signed main(){
    double r;
    cin>>r;
    r *= 2*M_PI;
    cout<<r<<endl;  
}


Compiler output:
main.c:1:1: error: unknown type name 'using'
    1 | using namespace std;
      | ^~~~~
main.c:1:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    1 | using namespace std;
      |                 ^~~
main.c:5:10: fatal error: bits/stdc++.h: No such file or directory
    5 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define endl '\n'
int main(){
    ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
    double r,pi=3.14159265358979323;
    cin>>r;
    double ans=2*r;
    ans*=pi;
    cout<<fixed<<setprecision(12)<<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

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

# -*- coding: utf-8 -*-
import math
a = int(input())
print(math.pi*a*2)

Compiler output:
main.c:1:3: error: invalid preprocessing directive #-
    1 | # -*- coding: utf-8 -*-
      |   ^
main.c:2:1: error: unknown type name 'import'
    2 | import math
      | ^~~~~~
main.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'a'
    3 | a = int(input())
      | ^
Language: C

#include <bits/stdc++.h>

using namespace std;

#define PI          3.1415926535897932384626433832795l

#define pb push_back
#define mp make_pair
#define lb lower_bound // First element which is not less than val
#define ub upper_bound // First element greater than val
#define f first
#define s second

#define sz(x) int((x).size())
#define all(x) (x).begin(), (x).end()

using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vb = vector<bool>;
using vd = vector<double>;
using vs = vector<string>;
using vpii = vector<pair<int,int>>;
using vpll = vector<pair<ll,ll>>;

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

#define endl '\n'
#define re return

#define rep(i,a,b) for (ll i = (a); i < (b); i++)
#define repz(i, a) for (ll i = 0; i < (a); i++)
#define repd(i,a,b) for (ll i = (a); i >= b; i--)
#define repdz(i,a) for (ll i = a; i >=0; i--)
#define trav(a, x) for (auto& a : x)

#define vecin(n,v) for(ll i = 0; i < n; i++) cin>>v[i];
#define llin(a) ll a; cin>>a;
#define llin2(a,b) ll a,b; cin >>a>>b;
#define llin3(a,b,c) ll a,b,c; cin>>a>>b>>c;
#define full(v) v.begin(),v.end()

void solve()
{
    int r;
    cin >> r;
    double f = 2.0*PI*r;
    cout << f << endl;
}

int main()
{
    //ios_base::sync_with_stdio(false);
    //llin(t);
    //while (t--)
    //{
        solve();
    //}
}


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

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

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


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

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

#define each(i, c) for (auto& i : c)
#define mkp(a, b) make_pair(a, b)

typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> Pll;
const ll MOD = 1e9+7;

template<typename P, typename Q> ostream& operator << (ostream& os, pair<P, Q> p) { os << "(" << p.first << ": " << p.second << ")"; return os; }
template<typename T> ostream& operator << (ostream& os, vector<T> v) { os << "("; each (i, v) os << i << ", "; os << ")"; return os; }
template<typename K, typename V> ostream& operator << (ostream& os, map<K, V> m) { os << "{"; each (i, m) os << i << ", "; os << "}"; return os; }

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

  r = r * 2;
  double ans = r * M_PI;
  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 <iostream>
using namespace std;

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


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

#include <bits/stdc++.h>
#define REP(i, n) for (decltype(n) i = 0; i < n; i++)
#define REPvec(itr, mp) for (auto itr = mp.begin(); itr != mp.end(); itr++)
#define all(x) x.begin(), x.end()
#define MOD 1000000007  // 1e9+7
using namespace std;
typedef long long int ll;
typedef vector<int> vecint;
typedef vector<ll> vecll;
typedef vector<double> vecd;
typedef vector<string> vecstr;
typedef vector<char> vecchar;
typedef vector<bool> vecbool;
typedef vector<vector<bool>> vec2bool;
typedef vector<vector<int>> vec2int;
typedef vector<vector<double>> vec2d;
////////////////////////////////////////////////
void init() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(15);
}
////////////////////////////////////////////////
int main() {
  init();
  double n;
  cin >> n;
  cout << 2.0 * 3.14159265 * 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 <bits/stdc++.h>
using namespace std;

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 <iostream>
#include <string>
#include <algorithm>
#include <cmath>
#include <deque>
#include <queue>
#include <stack>
#include <vector>
#include <utility>

#define REP(i,n) (int i = 0; i < (n); i++)
#define FOR(i,a,b) (int i=(a); i < (b); i++)
#define INF 100000000000
using namespace std;
using ll = long long;
using P = pair<int, int>;

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

    cout << n * 2 * 3.14 << endl;
    return 0;
}

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

//高知能系Vtuberの高井茅乃です。
//Twitter: https://twitter.com/takaichino
//YouTube: https://www.youtube.com/channel/UCTOxnI3eOI_o1HRgzq-LEZw

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

#define INF 1999999999
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define MODA 1000000007 

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

Compiler output:
main.c:5:10: fatal error: bits/stdc++.h: No such file or directory
    5 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

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

using i32 = int_fast32_t;
using i64 = int_fast64_t;

int main() {
    i32 r;
    cin >> r;
    cout << fixed << setprecision(15) << 2 * M_PI * r << endl;
}


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

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

#define rep(i, n) for(long long i=0;i<n;i++)
using ll = long long;
const ll INF = (1LL<<60);

int main(){

    long double r; cin >> r;

    cout << 2*3.14159265358979*r << endl;

    return 0;
}

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

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

int main()
{
    double r;
    cin >> r;
    cout << r * 6.28318530717958623200 << 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: Java

import java.lang.Math;
import java.util.Scanner;
public class Hello {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        System.out.println(2*a*Math.PI);

    }
}


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

/* Author: Rennan Rocha
 * Time: $%Y%$-$%M%$-$%D%$ $%h%$:$%m%$:$%s%$
**/

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

#define F first
#define S second
#define PB push_back
#define MP make_pair

#define ll long long
#define vi vector<int>
#define vll vector<ll>
#define pi pair<int,int>
#define pll pair<ll, ll>
#define vpi vector<pi>
#define vpll vector<pll>

using namespace std;
using namespace __gnu_pbds;

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
//*find_by_order(); order_of_key();

int main() {
    ios_base::sync_with_stdio(false);

    long double r;
    cin >> r;

    cout << 2 * 3.14 * r << endl;
}


Compiler output:
main.c:5:10: fatal error: bits/stdc++.h: No such file or directory
    5 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include <iostream>
#include<string>
#include<cmath>
#include<algorithm>
#include<cctype>
#include<queue>
#include<deque>
#include<regex>
#include<stack>
#include<stdio.h>
#include<vector>
#include<set>
#include<map>
#include<iomanip>
#define rep(i,n) for(int i=0;i<n;i++)

typedef int long long ll;
using namespace std;
typedef pair<int,int> P;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
const ll MOD=1e9+7;
static const int MAX = 100;
static const int INF = (1<<23);
template<class T> T gcd(T a, T b){return b? gcd(b,a%b) : a;}
template<class T> T lcm(T a,T b){return a / gcd(a,b)*b;}

int main(){
    cout<<setprecision(16);
    double r;
    cin>>r;
    cout<<2*r*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

// =====================================================================================
//
//       Filename:  at.cpp
//
//    Description:  
//
//        Version:  1.0
//        Created:  19/04/20 05:21:38 PM IST
//       Revision:  none
//       Compiler:  g++
//
//         Author:  Kiran Bhanushali (), kiranbhanushali143.kb143@gmail.com
//   Organization:  
//
// =====================================================================================

#include<bits/stdc++.h>


using namespace std;

#define int long long 
#define pb push_back
//#define _SHOW_TIME

void solve(){
    //your code here;
    int n ;
    cin>>n;
    cout<<(double)n*2*22/7.0<<endl;
}
int32_t main(){
 /////////////////////////////////////
    #ifdef _SHOW_TIME
	int tt = (int) clock();
    #endif
    /////////////////////////////////////
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    /////////////////////////////////////
    solve();
    /////////////////////////////////////
    #ifdef _SHOW_TIME
        cerr << "TIME = " << (double)(clock() - tt) / CLOCKS_PER_SEC << endl;
    #endif
    /////////////////////////////////////
    return 0;

}



Compiler output:
main.c:17:9: fatal error: bits/stdc++.h: No such file or directory
   17 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<=(b);++i)
#define per(i,a,b) for(int i=a;i>=(b);--i)
#define mem(a,x) memset(a,x,sizeof(a))
#define pb push_back

#define mk make_pair
using namespace std;
typedef long long ll;
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
const double pi=acos(-1);
void solve()
{
    double r;
    cin>>r;
    double ans=pi*2*r;
    printf("%.6f\n",ans);
}
int main()
{
	//int _;cin>>_;while(_--)
	solve();
}


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

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define _GLIBCXX_DEBUG
#define rep(i, c) for (int i = 0; i < (int)c; i++)
#define debug(x) cout << #x << " = " << x << endl
#define print(x) cout << x << endl;
const ll MOD = 1000000007;

int main()
{
    int R;
    cin >> R;
    const double PI = 3.14159265358979323846;
    cout << fixed << setprecision(30);
    cout << 2 * R * PI << endl;
}

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

/*
    Created by vasu090 on 19 Apr, 2020
*/
#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>

using namespace std;

#define rep(i, a, b) for(auto (i)=a;i<b;i++)
#define list(i, N) for(auto (i)=0;i<N;i++)

typedef long long ll;
typedef vector <ll> vi;
typedef pair <ll, ll> pi;
#define mp make_pair
#define pb push_back
#define eb emplace_back

#define int ll
#define INF 1e18+5
#define mod 1000000007

template<class T>
T max(T a, T b, T c) {
    return max(a, max(b, c));
}

int32_t main() {

    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int r; cin >> r;
    cout << M_PI * 2 * r << "\n";

    return 0;
}

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

import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
printV = lambda x: print(*x, sep="\n")
printH = lambda x: print(" ".join(map(str,x)))
def IS(): return sys.stdin.readline()[:-1]
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LII(rows_number): return [II() for _ in range(rows_number)]
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
mo = 10**9+7

def main():
	r = II()
	print(2*r*3.14)

if __name__ == '__main__':
	main()

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import sys
      | ^~~~~~
main.c:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'sys'
    3 | sys.setrecursionlimit(10 ** 6)
      | ^~~
main.c:21:16: warning: multi-character literal with 8 characters exceeds 'int' size of 4 bytes
   21 | if __name__ == '__main__':
      |                ^~~~~~~~~~
Language: C++

#include <bits/stdc++.h>                                     
using namespace std;                                 
                                                 
#define ll long long                           
#define MOD 1000000007                      
                                           
int main() {                             
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);     

	int n;
	cin>>n;
	double pi=3.14
	double ans=2*pi*n;
	cout<<ans<<endl;

	return 0;
}      

Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: error: expected ',' or ';' before 'double'
   14 |         double ans=2*pi*n;
      |         ^~~~~~
a.cc:15:15: error: 'ans' was not declared in this scope; did you mean 'abs'?
   15 |         cout<<ans<<endl;
      |               ^~~
      |               abs
Language: C

#include <bits/stdc++.h>

using namespace std;

#define sz(x) (int) x.size()
#define all(a) a.begin(), a.end()

const double pi = acos(-1.0);


int main() {

    double r;
    cin >> r;

    printf("%.12lf\n", 2 * pi * 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 <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i=0; i < (int)(n); i++)
using ull = unsigned long long;
using ll = long long;

#define PI 3.14159265359

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

    cout << R * 2 * PI << endl;

    return 0;
}



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

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (ll i = 0; i < n; i++)
#define repl(i, l, r) for (ll i = (l); i < (r); i++)
#define per(i, n) for (ll i = n - 1; i >= 0; i--)
#define lper(i, r, l) for (ll i = r - 1; i >= l; i--)
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define CST(x) cout << fixed << setprecision(x)
using ll = long long;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using pl = pair<ll, ll>;
const ll MOD = 1000000007;
const int inf = 1e9 + 10;
const ll INF = 4e18;
const ll dy[4] = {1, 0, -1, 0};
const ll dx[4] = {0, -1, 0, 1};
int main() {
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(false);
	double r;
	cin >> r;
	CST(10) << 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 <iostream>
#include <bits/stdc++.h>
using namespace std;
using ll = int64_t;
#define rep(i,n) for(int i = 0; i < ((int)(n)); i++)   // 0-indexed昇順

int main() {
    int R;
    cin >> R;
    std::cout << std::fixed << std::setprecision(15);
    cout << 2 * M_PI * R << endl;
}

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

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

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

template<class T> using v = std::vector<T>;
template<class T> using vv = v<v<T>>;

const int mod = 1000000007;
//const int mod = 998244353;

struct mint {
    ll x; // typedef long long ll;
    mint(ll x=0):x((x%mod+mod)%mod){}
    mint operator-() const { return mint(-x);}
    mint& operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint a) {
        if ((x += mod-a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
    mint operator+(const mint a) const { return mint(*this) += a;}
    mint operator-(const mint a) const { return mint(*this) -= a;}
    mint operator*(const mint a) const { return mint(*this) *= a;}
    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t>>1);
        a *= a;
        if (t&1) a *= *this;
        return a;
    }

    // for prime mod
    mint inv() const { return pow(mod-2);}
    mint& operator/=(const mint a) { return *this *= a.inv();}
    mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}


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

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

// combination mod prime
// https://www.youtube.com/watch?v=8uowVvQ_-Mo&feature=youtu.be&t=1619
struct combination {
    vector<mint> fact, ifact;
    combination(int n):fact(n+1),ifact(n+1) {
        assert(n < mod);
        fact[0] = 1;
        for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
        ifact[n] = fact[n].inv();
        for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
    }
    mint operator()(int n, int k) {
        if (k < 0 || k > n) return 0;
        return fact[n]*ifact[k]*ifact[n-k];
    }
};

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

#define CPP_STR(x) CPP_STR_I(x)
#define CPP_CAT(x,y) CPP_CAT_I(x,y)
#define CPP_STR_I(args...) #args
#define CPP_CAT_I(x,y) x ## y
#define ASSERT(expr...) assert((expr))

using i8  = int8_t;
using u8  = uint8_t;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f32 = float;
using f64 = double;
using ll = long long;
constexpr i64 INF = 1010000000000000017LL;
constexpr i64 MOD = 1000000007LL;
constexpr f64 EPS = 1e-12;
constexpr f64 PI = 3.14159265358979323846;
#define FOR(i, start, end) for(i64 i = (start), CPP_CAT(i,xxxx_end)=(end); i < CPP_CAT(i,xxxx_end); ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(f,c,...) (([&](decltype((c)) cccc) { return (f)(std::begin(cccc), std::end(cccc), ## __VA_ARGS__); })(c))
template<typename C>
i64 SIZE(const C& c) { return static_cast<i64>(c.size()); }
template<typename T, size_t N>
i64 SIZE(const T (&)[N]) { return static_cast<i64>(N); }
template<typename T, typename U, typename Comp=less<>>
bool chmax(T& xmax, const U& x, Comp comp={}) {
    if(comp(xmax, x)) xmax = x; return true;
    return false;
}
template<typename T, typename U, typename Comp=less<>>
bool chmin(T& xmin, const U& x, Comp comp={}) {
    if(comp(x, xmin)) xmin = x; return true;
    return false;
}
struct ProconInit {
    static constexpr int IOS_PREC = 15;
    static constexpr bool AUTOFLUSH = false;
    ProconInit() {
        cin.tie(nullptr); ios::sync_with_stdio(false);
        cout << fixed << setprecision(IOS_PREC);
        if(AUTOFLUSH) cout << unitbuf;
    }
} PROCON_INIT;
ll mod_pow(ll x, ll n) {
    if (n == 0) return 1;
    if (n % 2 == 0) return mod_pow(x * x % MOD, n / 2) % MOD;
    else return x * mod_pow(x, (n - 1)) % MOD;
}
ll mod_pow_r(ll x, ll n) {
    if (x == 0) return 0;
    if (n == 0) return 1;
    ll ret = 1;
    while (n) if (n & 1) ret = ret * x % MOD; x = x * x % MOD; n /= 2;
    return ret;
}
ll factorial(ll n) {
    ll ret = 1;
    REP(i, n) ret *= (i + 1); ret %= MOD;
    return ret;
}
ll combination(ll n, ll r) {
    if (n < 0 || n < r || r < 0) return 0;
    ll fn = factorial(n);
    ll fr = factorial(r);
    ll fn_r = factorial(n-r);
    ll d = (mod_pow(fr, MOD - 2) * mod_pow(fn_r, MOD - 2)) % MOD;
    ll u = fn % MOD;
    return u * d % MOD;
}

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

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

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

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

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

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

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define all(t) t.begin(), t.end()
#define inrange(i, a, b) (((i)>= min((a), (b))) && ((i) <= max((a), (b))))
typedef vector<ll> vi;
#define fi first
#define se second
const ll inf = 9e18;
const ll mod = 1e9 + 7;

void print(ll a[], ll n){for(ll i=0;i<n;i++){cout<<a[i]<<" ";}cout<<"\n";}
ll power(ll x, ll y, ll M = inf){
    ll ans = 1;
    x %= M;
    while(y){
        if(y&1)
            ans = (x * ans) % M;

        x = (x * x) % M;
        y >>= 1;
    }
    return ans;
}
ll modInverse(ll n) {return power(n, mod-2, mod);}
inline ll mul(ll a, ll b){ return (a * b) % mod; }
inline ll sub(ll a, ll b){ ll c = a - b; if(c < 0) c += mod; return c; }
inline ll add(ll a, ll b){ ll c = a + b; if(c > mod) c -= mod; return c; }
inline ll divi(ll a, ll b){ return mul(a, modInverse(b)); }

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

	ll n;
	cin>>n;
	cout<<2*3.1415*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;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long ll;
typedef pair<ll,ll> P;
const ll mod=1000000007;
const ll LINF=1LL<<60;
const int INF=1<<30;

int main(){
	double r;cin>>r;
	cout << 2.00000000 * r * 3.141592 << 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 < n; i++)

using namespace std;
using ll = long long;


int main(){
    double r; cin >> r;
    double pi = 3.141592;
    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;
using int64 = long long;
#define int int64
#define rep(i, n) for(int i=0; i<n; i++)
#define FOR(i, a, b) for(int i=a; i<b; i++)
#define SORT(x) sort(x.begin(), x.end())
#define GSORT(x) sort(x.begin(), x.end(), greater<int>())
#define mk make_pair
#define fi first
#define se second
#define pb push_back
#define ALL(x) x.begin(), x.end()
#define V(T) vector<T>
typedef pair<int, int> P;
typedef pair<P, P> PP;
typedef vector<int> vi;
typedef vector<vi> vvi;
int max(int a, int b) {if(b>a) return b; else return a;}
int min(int a, int b) {if(b<a) return b; else return a;}


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

    cout << fixed << setprecision(6);
    cout << R*2.0*3.14159265 << 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;
using ll = long long;
#define rep(i,n) for(int i = 0; i < (n); i++)

int main(){
   int R;
   cin >> R;
   cout << R * 2 * 3.1415 << endl; 
}


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

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

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;


#define REP(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define all(x) (x).begin(),(x).end()
#define m0(x) memset(x,0,sizeof(x))

int dx4[4] = {1,0,-1,0}, dy4[4] = {0,1,0,-1};


int main()
{
    std::cout << std::fixed;
    std::cout << std::setprecision(6);
    double d;
    cin>>d;
    cout<<2.0*d*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 <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <complex>
using namespace std;

typedef long long ll;
typedef uint64_t ull;
typedef pair<int, int> P;
constexpr double PI = 3.1415926535897932;   // acos(-1)
constexpr double EPS = 1e-9;
constexpr int INF = 1001001001;
constexpr int mod = 1000000007;
// constexpr int mod = 998244353;

#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)

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

    double r;
    cin >> r;
    double pi = acos(-1);
    double ans = r * 2 * pi;
    cout << fixed << setprecision(10);
    cout << ans << 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 int long long
using namespace std;
constexpr int mod=1e9+7;
signed main(){
    int r;
    cin>>r;
    cout<<r*2*3.14159265<<endl;
}


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

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using vec = vector<ll>;
using mat = vector<vec>;
using vec_b = vector<bool>;
using vec_str = vector<string>;
using graph = mat;
using edge = pair<ll,ll>;
using wgraph = vector<vector<edge>>;

#define INF (1LL << 60)
#define MOD 1000000007

#define REP(i,m,n) for(ll (i)=(m),i##_len=(n);(i)<(i##_len);++(i))
#define FORR(i,v) for(auto (i):v)
#define ALL(x) (x).begin(), (x).end()
#define _PR(x) cout << (x) << endl
#define _PS(x) cout << (x) << " "
#define SZ(x) ((ll)(x).size())
#define MAX(a,b) (((a)>(b))?(a):(b))
#define MIN(a,b) (((a)<(b))?(a):(b))
#define pb push_back


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

    cout << setprecision(10) << R*2*3.14159265358979 << 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 N;
  	cin>>N;
  	cout<<2.0*(3.14159265)*N<<'\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 <iomanip>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#define ll long long
#define rep(i,n) for(ll i=0;i<n;++i)
#define rep1(i,n) for(ll i=1;i<n;++i)
#define mrep(i,n) for(ll i=n;i>=0;--i)
#define vl vector<ll>
#define vvl vector<vector<ll> >
#define vb vector<bool>
#define vvb vector<vector<bool> >
#define inf 1001001001001000
#define mod 1000000007
#define pi 3.1415926535
using namespace std;

int main(void){
    double d;
    cin>>d;
    cout<<fixed<<setprecision(10)<<2*d*pi<<endl;
}


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

#include<iostream>
#include<string>
#include<vector>
#include<iomanip>
#include<algorithm>
#include<queue>
#include<stack>
#include<list>
#include<map>
#include<deque>
#include<math.h>
using namespace std;
#define ll long long
int main(){
    double R;
    cin >> R;
    cout << setprecision(20) << 2.0*R*3.14159265358979323846264;
    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  ft  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define  ll  long long
#define  pi  pair<int,int>
#define  pb  push_back
#define  F   first
#define  S   second
#define  P   2*acos(0.0)
const int N=2e5+3;
//string s,p;
//vector<int>v;
//map<int,int>mp;
//set<ll>st;
int main()
{
    ft
    double t,i,j,n,m,l,r;
    cin>>l;
    cout<<fixed<<setprecision(20)<<(2.0*P*l)<<"\n";
    return 0;
}



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

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

int main(){
  double R;
  cin >> R;
  const double PI=acos(-1);
  cout << fixed << setprecision(20) << 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

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

namespace PaizaTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var r = double.Parse(Console.ReadLine());

            Console.WriteLine(2.0 * r * Math.PI);
#if DEBUG
            Console.ReadLine();
#endif
        }
    }
}


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.Collections.Generic;
      | ^~~~~
main.c:2:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | using System.Collections.Generic;
      |             ^
main.c:3:1: error: unknown type name 'using'
    3 | using System.Linq;
      | ^~~~~
main.c:3:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    3 | using System.Linq;
      |             ^
main.c:5:1: error: unknown type name 'namespace'
    5 | namespace PaizaTest
      | ^~~~~~~~~
main.c:6:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    6 | {
      | ^
Language: C

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

#define fi first
#define se second
#define pb push_back
#define int long long
#define all(x) (x).begin(), (x).end()

using LL = long long;
using LD = long double;
using pii = pair<int, int>;
using vii = vector<pii>;

const int INF = 1e18;
const int MOD = 1e9 + 7;
const int N = 1e5 + 5;

int32_t main() {
    //ios::sync_with_stdio(false); cin.tie(nullptr);

    double r;
    cin >> r;

    double pi = acos(-1);
    cout << fixed << setprecision(10);
    cout << 2*pi*r << "\n";
}

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

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

using ll = long long;
using ull = unsigned long long;
using st = string;
using db = double;
using vll = vector<long long>;
using vdb = vector<db>;
using vvll = vector<vll>;
using vst = vector<st>;
using vchar = vector<char>;
using pll = pair<ll, ll>;
using vpll = vector<pll>;
using vvpll = vector<vpll>;
#define rep(i, m, n) for (ll i = (ll)(m); i < (ll)(n); i++)
#define vrep(i, vec) for(auto& i : vec)
#define vin(vec) for(auto& i : vec) cin >> i
#define all(v) v.begin(), v.end()
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;}
const ll mod = 1000000007;
const ll inf = 1LL << 60;


int main(){
  db r;
  cin >> r;
  cout << fixed << setprecision(3);
  cout << r * 3.141592 * 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.
Language: C

#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define rep(i,n) for(int i=0;i<n;i++)
#define INF 999999999
const int mod = 1000000007;
ll cnt = 0;

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

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

#include<stdio.h>

int main()
{
	double a;
	scanf_s("%lf", &a);
	a *= 6.28318530717958623200;
	printf("%f",a);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'scanf_s' was not declared in this scope; did you mean 'scanf'?
    6 |         scanf_s("%lf", &a);
      |         ^~~~~~~
      |         scanf
Language: C

#include <iostream>
#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
const int MODU = 1e9+7;
const int N = 1e5+10;

void solve() {
		
}

int main() {
	const double PI = 2*3.1415926;
	cout << setprecision(12);
	int r;
	cin >> r;
	cout << PI * r << endl; 
	return 0;
}

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

#include <bits/stdc++.h>
#define _GLIBCXX_DEBUG
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
using namespace std;
using ll = long long;
const int INF = 1001001001;
const int MOD = 1000000007;
typedef long long ll;

template<typename T> void print(const T & v);


int main() {
    double R;
    cin >> R;
    cout << fixed << setprecision(5) << R * 2 * M_PI << endl;
}






// Use For Debug
template <typename T>
void print(T const & v){
    for(int i = 0; i < v.size(); i++){
        if(i) cout << " ";
        cout << v[i];
    }
    cout << 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) {
    int R;
    cin >> R;
    printf("%lf\n", (double)R * 3.1415 * 2.0);
    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<string>
#include<vector>
#include<cstdlib>
#include<queue>

using namespace std;

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

int main(){
    double r;
    cin >> r;
    const double PI=3.14159;
    cout << 2 * r * PI << endl;
}


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>
#include <ext/pb_ds/assoc_container.hpp>

#define x first
#define y second
#define ndl '\n'
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define up_b upper_bound
#define low_b lower_bound
#define sz(x) (int)x.size()
#define bit __builtin_popcount
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

using namespace std;
using namespace __gnu_pbds;

template<typename T> using indexed_set = tree <T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

typedef long long ll;
typedef long double ld;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;
typedef pair<int, ull> piu;
typedef vector<vector<int>> matrix;

const ll INF = 1e18 + 123;
const ld EPS = 1e-9;
const int inf = 1e9 + 123;
const int MOD = 1e9 + 7;
const int N = 5e5 + 123;
const int M = 1e6 + 123;
const double pi = acos(-1.0);
const int dx[] = {0, 0, 1, -1};
const int dy[] = {1, -1, 0, 0};

void solve(){
    int n;
    cin >> n;
    cout <<fixed<<setprecision(2) << 2*pi*n;
}

int main(){
    #ifdef KAZAKH
        //freopen("input.txt", "r", stdin);
    #endif
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
    //cin >> t;
    for (int i = 1; i <= t; i++){
        //cout << "case #" << i << ": ";
        solve();
    }
    return 0;
}


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

#include <iostream>
#include <cstdlib>
#include <vector>
#include <cmath>
#include <utility>
#include <algorithm>
#include <set>
#include <queue>
#include <climits>
#include <limits>
#include <map>

#define ll long long
#define max(A, B) ((A) > (B) ? (A) : (B))
#define min(A, B) ((A) < (B) ? (A) : (B))
#define mp(A, B) make_pair(A, B)
#define pb push_back
#define fu(A, B, C) for(ll (A) = (B); (A) < (C); (A)++)
#define fu0(A, B) fu((A), 0, (B))
#define fd(A, B, C) for(ll (A) = (B); (A) >= (C); (A)--)
#define mem(A, B) memset((A), (B), sizeof((A)))
#define v(A, B, C) vector<ll> (A)((B), (C));
#define v0(A, B) v((A), (B), 0);


using namespace std;

typedef pair<int, int> pi;

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

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ll t = 1; //cin >> t;
  fu0(i, t) {perform();}
}


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;
#define rep(i,n) for (int i = 0; i< (n); ++i)
const long long INF = 1LL<<58;

// aを常に小さい値にする　大きい値にする
template<class T> bool chmin(T &a, T b){
    if(a>b) {
        a = b;
        return true;
    }
    return false;

}
template<class T> void chmax(T &a, T b){ if(a<b) a = b; }

// 二分探索 前方のindexを返すもの（自分自身を含む） 前方: -INF側のこと
template<class T> int former(const vector<T> &v, T x){
    return upper_bound(v.begin(), v.end(), x) - v.begin() -1; // upper_bound : keyより大きい要素の内の一番左側のイテレータを返す
}
// 二分探索 後方のindexを返すもの（自分自身を含む）後方: INF側のこと
template<class T> int latter(const vector<T> &v, T x){
    return lower_bound(v.begin(), v.end(), x) - v.begin(); // lower_bound : key以上の要素の内の一番左側のイテレータを返す
}

/*
 *
 * */

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

    double res = N * 2 * 3.14159265;
    cout << res << endl;
}

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