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

#include<iostream>
int main()
{
  int r;
  double circum;
  cin>>r;
  circum=2*3.1415;
  circum=circum*r;
  cout<<circum;
  return 0;


}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin>>r;
      |   ^~~
      |   std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 |   cout<<circum;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

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

int main(void) {
    int x, n;

    fgets (x, sizeof(buf), stdin);
    sscanf(x,"%lf\n", &n);
    
    printf("%f\n", (double)n * M_PI);

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:22: error: 'buf' undeclared (first use in this function)
    7 |     fgets (x, sizeof(buf), stdin);
      |                      ^~~
main.c:7:22: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:12: error: passing argument 1 of 'fgets' makes pointer from integer without a cast [-Wint-conversion]
    7 |     fgets (x, sizeof(buf), stdin);
      |            ^
      |            |
      |            int
In file included from main.c:1:
/usr/include/stdio.h:654:38: note: expected 'char * restrict' but argument is of type 'int'
  654 | extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
      |                     ~~~~~~~~~~~~~~~~~^~~
main.c:8:12: error: passing argument 1 of 'sscanf' makes pointer from integer without a cast [-Wint-conversion]
    8 |     sscanf(x,"%lf\n", &n);
      |            ^
      |            |
      |            int
/usr/include/stdio.h:430:43: note: expected 'const char *' but argument is of type 'int'
  430 | extern int sscanf (const char *__restrict __s,
      |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~
Language: Java

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

Compiler output:
Main.java:2: error: modifier private not allowed here
private class Solution {
        ^
1 error
Language: C

#include <bits/stdc++.h>
#define rep(i,x) for(int i=0; i<(int) (x); i++)
#define PI 3.14159265359
using namespace std;

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

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

#include <iostream>
#define Endl '\n'
int main()
{
    float n;
    scanf("%f",&n);
    n=3.14*n*2;
    printf("%.2f\n",n );
}

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

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

typedef long long ll;
typedef long double ld;
typedef pair<int,int> Pii;
typedef pair<ll, ll> Pll;
typedef pair<int, Pii > P1;

#define rep(i,n) for(int i=0;i<n;i++)
#define sor(v) sort(v.begin(),v.end())
#define rev(s) reverse(s.begin(),s.end())
#define lb(vec,a) lower_bound(vec.begin(),vec.end(),a)
#define ub(vec,a) upper_bound(vec.begin(),vec.end(),a)
#define mp1(a,b,c) P1(a,P(b,c))
#define get_arsize(a) (sizeof(a)/sizeof(a[0]))
#define PI 3.14159265359
const ll MOD = 1000000007;
const double EPS = 1e-10;
const int MAX = 200000;
// 20 mins delayed
int main() {
  double n;
  cin >> n;

  cout << setprecision(5) << n * (double)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<iostream>
#define PI 3.14159265359
using namespace std;
int main(){
  int R;
  cin >> R;
  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<iostream>

template<typename T, int size>
struct PreCirclePond
{
    T ary[size];
    static constexpr float pi = 3.141592;

    constexpr PreCirclePond() : ary() {
        for (int i = 0; i < size; i++)
        {
            const int t = i * 2;
            ary[i] = t * pi;
        }
    }

    T take(int r) const {
        return ary[r];
    }
};

template<class R>
float ciclePondP(R r) {
    constexpr auto a = PreCirclePond<float, 100>();
    return a.take(r);
}

int main() {
    using namespace std;
    ios_base::sync_with_stdio(false);

    int R;
    cin >> R;

    cout << ciclePondP(R);
}

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

#include <iostream>
#include <string>
#include <algorithm> 
#include <map>
using namespace std;
const int maxn = 1e5+10;
int main()
{
	float a;
	cin >> a;
	cout << 2*r*3.14 << endl;	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:19: error: 'r' was not declared in this scope
   11 |         cout << 2*r*3.14 << endl;
      |                   ^
Language: C

#include <bits/stdc++.h>
#include <iostream>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;

int main(){
    double r;
    cin>>r;
    cout<<fixed<<setprecision(2)<<2*r*3.141592653589793238462643383279502884197169399375105820979445923078164062862089986280348253421170679821480865132823067647093844609550582231725359408128481117450284102701938521109555964462294895493038196442881097566593344612847564823378678316527120190914564856692346034861045432664821339360726024914127372458700660631558817488152092096282925409171536436789259036001133053054882046652138414695194151160943305727036575959195309218611738193261179310511854807446237996274956735188575272489122793818301194912983367336244065664308602139494639522473719070217986094370277053921717629317675238467481846766940513200056812714526356082778577134275778960917363717872146844090122495343014654958537105079227968925892354201995611212902196086403441815981362977477130996051870721134999999837297804995105973173281609631859502445945534690830264252230825334468503526193118817101000313783875288658753320838142061717766914730359825349042875546873115956286388235378201667315642315632318742318732312842312832365832369732364722392310116732315642315632328732318742312832312832315842315832319742319732314772392310116732365632318712318722318742352832315842158323197423197323147723923101167323156423156323187223181231873231284231283231584231583231974231973231477239231011742345642318732328732362832315842315832369732314772392330172392310166732312842312832369682310882310116742312832312882319682310882310116742352862339642350882310116732312842312882319632310842310882310116732362832369632360882340169632312742312762314223101196323127423127623148223101923396323627623148223101196323127423127623148223101696323127423127423548101;
    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 namespace std;
 
int main() {
  int R;
 cin >> R;
    
    
    
    cout <<R*2*3.14 << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:2: error: 'cin' was not declared in this scope
    6 |  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 | 
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout <<R*2*3.14 << endl;
      |     ^~~~
a.cc:10:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:24: error: 'endl' was not declared in this scope
   10 |     cout <<R*2*3.14 << endl;
      |                        ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 |
Language: C

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

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

///Bismillahir Rahmanir Rahim
///Hello_World_Its_Rakib_Alam_Bappi
#include<bits/stdc++.h>
#include <cmath>
using namespace std;
///ascii for  A=65   and   a=97
#define		int 	long long
#define 		pb 	push_back
#define 		mp 	make_pair
#define 		pi 	2*acos(0.0)
#define 		loopi 	for(int i = 0 ; i <t ; i++)
#define 		loopj 	for(int j = 0 ; j < n ; j++)
#define 		backj 	for(int j = n-1 ; j >=0 ; j--)
#define 		vect 	vector<int>
#define 		vec_it 	vector<int>::iterator vi
#define 		mapp 	map<int,int>m
#define 		pairr 	pair<int,int>p
#define 		sett	set<int>s
#define 		set_it 	set<int>::iterator si
#define 		yes 	cout<<"YES"<<endl
#define 		no 	cout<<"NO"<<endl
#define 		xx 	first
#define 		xy 	second
main()
{
    /// freopen ("in.txt" , "r",  stdin) ;
    string st;
    double n,k,t,temp=0,cnt=0,x,y=0,sum=0;
    cin>>n;
    sum=2*M_PI*n;
    printf("%lf",sum);
    
}

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

//
// Created by yamunaku on 2020/04/19.
//

#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (n); i++)
#define repl(i, l, r) for(int i = (l); i < (r); i++)
#define per(i, n) for(int i = ((n)-1); i >= 0; i--)
#define perl(i, l, r) for(int i = ((r)-1); i >= (l); i--)
#define all(x) (x).begin(),(x).end()
#define MOD9 998244353
#define MOD1 1000000007
#define IINF 1000000000
#define LINF 1000000000000000000
#define SP <<" "<<
#define CYES cout<<"Yes"<<endl
#define CNO cout<<"No"<<endl
#define CFS cin.tie(0);ios::sync_with_stdio(false)
#define CST(x) cout<<fixed<<setprecision(x)

using ll = long long;
using ld = long double;
using vi = vector<int>;
using mti = vector<vector<int>>;
using vl = vector<ll>;
using mtl = vector<vector<ll>>;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
template<typename T>
using heap = priority_queue<T, vector<T>, function<bool(const T, const T)>>;

int main(){
    //CFS;
    double r;
    cin >> r;
    CST(10);
    cout << 2 * 3.1415926535 * r << endl;
    return 0;
}

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;
 
int main() {
	double x;
    cin >> x;
    x=x*6.283185317958;
    cout << x << endl;
    }

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

#include<bits/stdc++.h>
#include <math.h>
#define PI acos(-1)
using namespace std;
#define AC ios::sync_with_stdio(false);cin.tie(0);


int main()
{
    AC
    double n,;
    cin>>n;
    cout<<2*PI*n;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:14: error: expected unqualified-id before ';' token
   11 |     double n,;
      |              ^
Language: C

#include <bits/stdc++.h>

using namespace std;

int main() {
  double circle_length=0;
  double R;
  
  cin >> R;
  
  circle_length=2*R*M_PI;
  
  cout << circle_length << 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

enshu = int(input(R))
print(enshu * 2 *3.141592)



Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | enshu = int(input(R))
      | ^~~~~
main.c:1:1: error: type defaults to 'int' in declaration of 'enshu' [-Wimplicit-int]
main.c:1:9: error: expected expression before 'int'
    1 | enshu = int(input(R))
      |         ^~~
Language: C

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const int mod = 1e9+7;
//const ll mod = 1e9+7;
const int inf = 0x3f3f3f3f;
const int ninf = 0xc0c0c0c0; 
int main(){
	//freopen("in.txt","r",stdin);
	double n;
	cin>>n;
	const double pi = acos(-1);
	printf("%.4lf\n" , 2*pi*n);
	return 0;
}

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

#include <bits/stdc++.h>
#include <iostream>
#include <numeric>
#include <string>
#include <list>
#include <limits>
#include <type_traits>

using namespace std;

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


int main(void) {

    double k;
    double p = 3.141592653589793238462643383279;
    
    cin >> k;

    k = 2 * k * p;
    
    cout << k;
}

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 = gets.to_i
puts 2*R*3.141592

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | R = gets.to_i
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'R' [-Wimplicit-int]
main.c:1:5: error: 'gets' undeclared here (not in a function)
    1 | R = gets.to_i
      |     ^~~~
main.c:2:1: error: expected ',' or ';' before 'puts'
    2 | puts 2*R*3.141592
      | ^~~~
Language: C

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

int main() {
  int a;

  cin >> a;

  cout << a * 2 * 3.1415926535979323846 << 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.util.Scanner;

public class Test {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		float r,c;
		Scanner in = new Scanner (System.in);
		r = in.nextFloat();
		c =  (float)(2*Math.PI*r);
		System.out.println(c);
	}

}


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

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

int main() {
  int n;
  cin >> n;
  float ans = 2 * n * 3.14159265;
  cout << std::fixed << std::setprecision(3)<< 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

/*************************************************************************
	> File Name: A.cpp
	> Author: Knowledge_llz
	> Mail: 925538513@qq.com 
	> Created Time: 2020/4/19 19:57:23
 ************************************************************************/

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>
#include<algorithm>
#define For(i,a,b) for(register int i=(a);i<=(b);++i)
using namespace std;
const double pi=acos(-1.0);
int read(){
	char x=getchar(); int u=0,fg=0;
	while(!isdigit(x)){ if(x=='-') fg=1; x=getchar(); }
	while(isdigit(x)){ u=(u<<3)+(u<<1)+(x^48); x=getchar(); }
	return fg?-u:u;
}
int main()
{
	int r;
	scanf("%d",&r);
	printf("%.18lf\n",r*pi*2);
	return 0;
}


Compiler output:
main.c:8:9: fatal error: iostream: No such file or directory
    8 | #include<iostream>
      |         ^~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int R;
  cin >> R;
  double p;
  p=3.141592653589;
  cout << R*2*p << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:8:25: error: expected '}' at end of input
    8 |   cout << R*2*p << endl;
      |                         ^
a.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^
Language: C

#include <iostream>

using namespace std;

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

  double ans = 0;

  ans = 2.0 * r * 3.14;

  cout << ans << 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 <string>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
	double R, length;
	cin >> R;
	length = 2 * R * 3.1415926;

	cout << length << 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 pi 3.14159265358979323846
using namespace std;
int main(){

    int r;
    cin>>r;
    double cr=2*pi*r;
    cout<<cr<<endl;
    return 0;
    
}

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

#include<iostream>

using namespace std;

int main(void)
{
  int n,m;
  int inp;
  cin>>n>>m;

  for(int i=0;i<m;i++)
  {
    cin>>inp;
    n-=inp;
  }

  if(n>=0)
  {
    cout<<n<<endl;
  }
  else
  {
    cout<<-1<<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>
#define ll long long
using namespace std;
int main()
{
	int r;
	cin>>r;
	double ans = 2*r*3.14159265358979323846;
	cout<<fixed << setprecision(20);
	cout<<ans<<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<cstdio>
#include<iostream>
#include<cmath>
using namespace std;

int main(){
	double R;
	cin >>R;
	double pi = acos(-1.0);
	
	printf("%.15lf\n",2*pi*R);
	
	return 0;
}

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

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

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


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

#include <bis/stdc++.h>
using namespace std;
int main(){
    const double PI=3.14159265358979323846;
    double R;
    cin>>R;
    cout<<(R*PI)<<endl;
}


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

import math
R = float(import())
L = 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 = float(import())
      | ^
Language: C++

#include <iostream>
#include <cmath>
#define pi acos(-1)

using namespace std;

int main() {
  double ans;
  int r;
  scanf("%d", &r);
   ans = 2.0 * pi * r;
   printf("%lf\n", ans);
  }
  return 0;
}
  

Compiler output:
a.cc:14:3: error: expected unqualified-id before 'return'
   14 |   return 0;
      |   ^~~~~~
a.cc:15:1: error: expected declaration before '}' token
   15 | }
      | ^
Language: C++

#include<iostream>
using namespace std;
int main() {
 int R;
double c;
cin >> R;
c = R * 2 * 3.1415926
cout << c << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:22: error: expected ';' before 'cout'
    7 | c = R * 2 * 3.1415926
      |                      ^
      |                      ;
    8 | cout << c << endl;
      | ~~~~
Language: C

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char** argv){
    double pi = 3.14159265;
    int r;
    if(scanf("%d", &r)==0){perror("scanf"); exit(1);}
    printf("%f\n",r*pi);
    return 0;

Compiler output:
main.c: In function 'main':
main.c:9:5: error: expected declaration or statement at end of input
    9 |     return 0;
      |     ^~~~~~
Language: C++

#include <iostream>
#define PI 3.1415926535897
using namespace std;

    int main()
    {
    	long double radius, area, circum;

    	cin>>radius;
	
		circum = 2*PI*radius;
        std::cout << std::setprecision(11)<< circum << endl;		
		
        cout << endl;
        return 0;
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:12:27: error: 'setprecision' is not a member of 'std'
   12 |         std::cout << std::setprecision(11)<< circum << endl;
      |                           ^~~~~~~~~~~~
a.cc:2:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    1 | #include <iostream>
  +++ |+#include <iomanip>
    2 | #define PI 3.1415926535897
Language: C++

#include <bist/stdc++.h>
using namespace std;
int main(){
    const double PI=3.14159265358979323846;
    double R;
    cin>>R;
    cout<<(R*PI)<<endl;
}


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

r=int(input())
L=2.0*3.1415*r
print(L)

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

#include <bits/stdc++.h>

using namespace std;

int main() {
  float PI=3.141;
  float r;
  cin>>r;
  float C;
  C=2*r*PI;
  cout<<C<<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;

using ll = long long;
using ld = long double;
using P = pair<int, int>;
constexpr ld eps = 1e-12;
constexpr int inf = numeric_limits<int>::max() / 2;
constexpr int mod = 1e9 + 7;

template <typename T>
void printv(const vector<T> &v) {
  int sz = v.size();
  for (int i = 0; i < sz; i++) {
    cout << v[i] << " \n"[i == sz - 1];
  }
}

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

  ld r;
  cin >> r;
  cout << fixed << setprecision(10) << 2 * r * acos(-1.0) << endl;
}


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

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

typedef long long ll;

const int M = (int)1e2;
const int inf = 0x3f3f3f3f;
const ll mod = (ll)1e9 + 7;
const double eps = 1e-8;

int main()
{
    int r; scanf("%d", &r);
    printf("%.12f\n", acos(-1.0) * 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;

int main() {
int R;
cin >> R;
cout << 6.28318530717958623200
*R << endl;
}

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

#include<stdio.h>
#define PI 3.141
using namespace std;
int main()
{
	int t;
	scanf("%d",&t);
	printf("%lf\n",2*PI*t);
	return 0;
}

Compiler output:
main.c:3:1: error: unknown type name 'using'
    3 | using namespace std;
      | ^~~~~
main.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    3 | using namespace std;
      |                 ^~~
Language: C

#include <bits/stdc++.h>
 
#define ll long long
#define vi vector<int>
#define vll vector<long long>
#define si set<int>
#define stk stack<int>
#define que queue<int>
#define pb push_back
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
const ll mod=1e9+7;
 
using namespace std;

int main(){
	int q=1;
	//cin>>q;
	while(q--){
		int n;
		cin>>n;

		cout<<setprecision(4)<<(44/(float)7)*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 <cstdio>

int main()
{
 	int a;
  scanf(“%d”, &a);
  return 3.1415926*2*a;
}

Compiler output:
a.cc:6:9: error: extended character “ is not valid in an identifier
    6 |   scanf(“%d”, &a);
      |         ^
a.cc:6:11: error: extended character ” is not valid in an identifier
    6 |   scanf(“%d”, &a);
      |           ^
a.cc: In function 'int main()':
a.cc:6:9: error: '\U0000201c' was not declared in this scope
    6 |   scanf(“%d”, &a);
      |         ^
a.cc:6:11: error: 'd\U0000201d' was not declared in this scope
    6 |   scanf(“%d”, &a);
      |           ^~
Language: C

    
/*
CODED BY               
**************
DARSHAN JAIN
darshanjain31
**************
*/
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define pb push_back
#define mp make_pair
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL);
#define endl '\n'
#define MOD 1000000007
using namespace std;

int main()
{
	fast;
	ll t;
	cin>>t;
	double mid=(double)2*3.14159*t;
	cout << std::setprecision(5) <<mid<<endl;  
}







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

#include<stdio.h>
#define PI 3.1415926
using namespace std;
int main()
{
	int t;
	scanf("%d",&t);
	printf("%lf\n",2*PI*t);
	return 0;
}

Compiler output:
main.c:3:1: error: unknown type name 'using'
    3 | using namespace std;
      | ^~~~~
main.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    3 | using namespace std;
      |                 ^~~
Language: C

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

int main(){
	double R;
	cin >>R;
	double pi = acos(-1.0);
	
	printf("%.15lf\n",2*pi*R);
	
	return 0;
}

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

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:3:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'R'
    3 | R = int(input())
      | ^
Language: C++

#include <iostream.h>
using namespace std;

#define PI 3.141592

int main()
{
    int r;
    cin >> r;
    float ans = 2 * PI * r;
    printf("%0.4f", ans);
    return 0;
}

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

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

using namespace std;

int main() {
	double R, length;
	cin >> R;
	length = R * 3.14159;

	cout << length << endl;
	
	return 0;
}

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

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

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

int main(){
  int s;
  cin >> s;
  
  cout << 2 * s * 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 <cstdio>
#include <fstream>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <deque>
#include <vector>
#include <queue>
#include <string>
#include <cstring>
#include <map>
#include <stack>
#include <set>
#include <sstream>
#define IOS ios_base::sync_with_stdio(0); cin.tie(0);
#define mod 1000000007
#define eps 1e-6
#define ll long long
#define INF 0x3f3f3f3f
#define MEM(x,y) memset(x,y,sizeof(x))
using namespace std;
int dt[][2]= {{1,0},{-1,0},{0,1},{0,-1},{0,0}};
//typedef pair<int, int> P;
//priority_queue<int, vector<int>, greater<int> > q;
int main()
{
   IOS;
   int r;
   cin >> r;
   double ans;
   double pi=acos(-1);
   ans=r*r*pi;
   cout<<fixed<<setprecision(5)<<ans;
}


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

#inclde <stdio.h>
void main()
{
int r=0;
int S;
  cin >> r;
  S = ( r + r ) * 3.14;
cout << S << endl;  
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inclde; did you mean #include?
    1 | #inclde <stdio.h>
      |  ^~~~~~
      |  include
a.cc:2:1: error: '::main' must return 'int'
    2 | void main()
      | ^~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> r;
      |   ^~~
a.cc:8:1: error: 'cout' was not declared in this scope
    8 | cout << S << endl;
      | ^~~~
a.cc:8:14: error: 'endl' was not declared in this scope
    8 | cout << S << endl;
      |              ^~~~
Language: Java

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


Compiler output:
Main.java:3: error: cannot find symbol
	Scanner sc = new Scanner (System.in);
	^
  symbol:   class Scanner
  location: class roundB
Main.java:3: error: cannot find symbol
	Scanner sc = new Scanner (System.in);
	                 ^
  symbol:   class Scanner
  location: class roundB
2 errors
Language: C

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef vector<vector<int>> vvi;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<ll> vll;

typedef pair<int, int> pii;

typedef queue<int> qi;
typedef queue<string> qs;


#define rep(i, n) for(int i=0; i<(n); ++i)
#define repp(i, a, b) for(int i = (a); i <= (b); i++)
#define Rep(i, n) for(int i=n; i >= 0; i--)

#define all(v) v.begin(), v.end()
//sort( all(v) )　などと使える


int main(){
    int r; cin >> r;
    cout << 2 * 3.14 * r << endl;
}

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

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

int main(){
    double a;
    cin>>a;
    cout<<2*a*3.141592653589793238462643383279502884197169399375105820979445923078164062862089986280348253421170679821480865132823067647093844609550582231725359408128481117450284102701938521109555964462294895493038196442881097566593344612847564823378678316527120190914564856692346034861045432664821339360726024914127372458700660631558817488152092096282925409171536436789259036001133053054882046652138414695194151160943305727036575959195309218611738193261179310511854807446237996274956735188575272489122793818301194912983367336244065664308602139494639522473719070217986094370277053921717629317675238467481846766940513200056812714526356082778577134275778960917363717872146844090122495343014654958537105079227968925892354201995611212902196086403441815981362977477130996051870721134999999837297804995105973173281609631859502445945534690830264252230825334468503526193118817101000313783875288658753320838142061717766914730359825349042875546873115956286388235378201667315642315632318742318732312842312832365832369732364722392310116732315642315632328732318742312832312832315842315832319742319732314772392310116732365632318712318722318742352832315842158323197423197323147723923101167323156423156323187223181231873231284231283231584231583231974231973231477239231011742345642318732328732362832315842315832369732314772392330172392310166732312842312832369682310882310116742312832312882319682310882310116742352862339642350882310116732312842312882319632310842310882310116732362832369632360882340169632312742312762314223101196323127423127623148223101923396323627623148223101196323127423127623148223101696323127423127423548101;
    return 0;
}


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

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double pi=3.1415926535897932384626;
    double r;
    cin>>r;
    r=r*2*pi;
    cout.precision(20);
    cout<<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(){
  double R;
  cin>>R;
  double ans;
  ans=2*3.1415*R;
 cout<<setprecision(6)<<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

/*input
73	
*/
/*

**************************
*						 *
* AUTHOR :: knight_coder *
*						 *
**************************

*/
#include<bits/stdc++.h>
#define lld          long long int
#define pb          push_back
#define ppb         pop_back
#define	endl		'\n'
#define mii         map<lld,lld>
#define msi         map<string,lld>
#define mis         map<lld, string>
#define mpi         map<pair<lld ,lld >,lld >
#define pii         pair<lld,lld>
#define vi          vector<lld>
#define vpi 		vector<pii>
#define vs          vector<string>
#define all(a)      (a).begin(),(a).end()
#define F           first
#define S           second
#define sz(x)       (lld)x.size()
#define hell        1000000007
#define rrep(i,m,n)	for(lld i=m;i>=n;i--)
#define rep(i,m,n)	for(lld i=m;i<n;i++)
#define lbnd        lower_bound
#define ubnd        upper_bound
#define bs          binary_search
#define mp          make_pair
#define what_is(x)  cerr << #x << " is " << x << endl;
#define pr(x) 		cout<< x << " ";
#define pre(x)		cout<< x << endl ;
#define PI 			3.14159265358979323
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
std::mt19937_64 rng(std::chrono::steady_clock::now().time_since_epoch().count());
template<typename T>
using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>; 
//change null_type to get ordered_map
#define N  100005
#define DEC(N)	cout << std::fixed; cout << setprecision(N);
void solve()
{
	long double x; 
	cin >> x;
	long double ans=2*PI*x;
	DEC(20);
	cout << ans << endl;
}
signed main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int tests=1;
	//cin>>tests;
	while(tests--)
	{
		solve();
	}
}

Compiler output:
main.c:13:9: fatal error: bits/stdc++.h: No such file or directory
   13 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#inclide<iomanip>
using namespace std;
int R;
double c;
cin >> R;
c = R * 2 * 3.1415926
cout << c << endl;

Compiler output:
a.cc:2:2: error: invalid preprocessing directive #inclide; did you mean #include?
    2 | #inclide<iomanip>
      |  ^~~~~~~
      |  include
a.cc:6:1: error: 'cin' does not name a type
    6 | cin >> R;
      | ^~~
a.cc:7:1: error: 'c' does not name a type
    7 | c = R * 2 * 3.1415926
      | ^
Language: C

#include <iostream>

using namespace std;

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

r = int(input())

ans = 2*r*float(3.14)

print(ans)

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

#include <bits/stdc++.h>
typedef long long ll;
# define M_PIl          3.141592653589793238462643383279502884L
using namespace std;



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

	cout<<2*M_PIl*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 <algorithm>
#include <bitset>
#include <cmath>
#include <ctime>
#include <iostream>
#include <list>
#include <map>
#include <math.h>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <stdio.h>
#include <string>
#include <tuple>
#include <vector>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n); i++)
#define all(a) begin(a),end(a)
typedef long long ll;
typedef pair<int,int> P;
const int inf=1e+9;
const ll mod=1000000007;
const double PI=3.14159265358979323846;
int dx[] = {1,-1,0,0};
int dy[] = {0,0,1,-1};
ll gcd(ll a, ll b){
  if (b==0) return a;
  else return gcd(b,a%b);
}
int cans(bool f){
  if(f) cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}






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

  return 0;
}


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

import java.util.*;
public class Solution {

	/**
	 * @param args the command line arguments
	 * @throws IOException
	 */
static Scanner s=new Scanner(System.in);
	public static void main(String[] args) throws IOException {
      {
		double r=s.nextDouble();
	System.out.println("the circumference = "+ 2*3.14*r);
	
		
		
	
	
	
		
	  }
}
	}

Compiler output:
Main.java:2: error: class Solution is public, should be declared in a file named Solution.java
public class Solution {
       ^
Main.java:9: error: cannot find symbol
	public static void main(String[] args) throws IOException {
	                                              ^
  symbol:   class IOException
  location: class Solution
2 errors
Language: C

#include<functional>
#include<algorithm>
#include<iostream>
#include<iomanip>
#include<cstring>
#include<cstdlib>
#include<utility>
#include<string>
#include<cstdio>
#include<vector>
#include<bitset>
#include<cmath>
#include<ctime>
#include<queue>
#include<deque>
#include<stack>
#include<map>
#include<set>
using namespace std;
const int inf=2147483647,dx[]={-1,0,1,0},dy[]={0,-1,0,1};// 上 左 下 右
const int N=100005,M=1000005,K=200005,mod=1000000007;
const long long llinf=9223372036854775807ll;
//int & long long
double r; 
int main(){
	cin>>r;
	cout<<r*3.1415926;
	return 0;
}


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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: invalid operands of types 'double' and '<unresolved overloaded function type>' to binary 'operator<<'
    8 |   cout << a *= r << endl;
      |                ~~^~~~~~~
Language: C

#include <stdio.h>

int main(){
  
int r=0;
double result=0;
scanf_s("%d", &r);
result = (double)r * 3.1415;
printf_s("%f",result);
}

Compiler output:
main.c: In function 'main':
main.c:7:1: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    7 | scanf_s("%d", &r);
      | ^~~~~~~
      | scanf
main.c:9:1: error: implicit declaration of function 'printf_s'; did you mean 'printf'? [-Wimplicit-function-declaration]
    9 | printf_s("%f",result);
      | ^~~~~~~~
      | printf
Language: C++

#include<bits/stdc++.h>
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define pb push_back
#define mp make_pair
#define fir first 
#define sec second
#define int long long
#define endl "\n"
# define M_PI 3.14159265358979323846
using namespace std;
const int nax=1e5+5;
vector<int>adj[nax];#include<bits/stdc++.h>
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define pb push_back
#define mp make_pair
#define fir first 
#define sec second
#define int long long
#define endl "\n"
//# define M_PI 3.14159265358979323846
using namespace std;
const int nax=1e5+5;
vector<int>adj[nax];
const int mod=1e9+7;
const int inf=1e18+7;

signed main(){
	int n;
	cin>>n;
	std::cout << std::setprecision(15) << 2*3.1415926*n << endl;
	return 0;
}


const int mod=1e9+7;
const int inf=1e18+7;

signed main(){
	int n;
	cin>>n;
	std::cout << std::setprecision(15) << 2*M_PI*n << endl;
	return 0;
}



Compiler output:
a.cc:12:21: error: stray '#' in program
   12 | vector<int>adj[nax];#include<bits/stdc++.h>
      |                     ^
a.cc:12:22: error: 'include' does not name a type
   12 | vector<int>adj[nax];#include<bits/stdc++.h>
      |                      ^~~~~~~
a.cc:22:11: error: redefinition of 'const long long int nax'
   22 | const int nax=1e5+5;
      |           ^~~
a.cc:11:11: note: 'const long long int nax' previously defined here
   11 | const int nax=1e5+5;
      |           ^~~
a.cc:23:12: error: redefinition of 'std::vector<long long int> adj [100005]'
   23 | vector<int>adj[nax];
      |            ^~~
a.cc:12:12: note: 'std::vector<long long int> adj [100005]' previously declared here
   12 | vector<int>adj[nax];#include<bits/stdc++.h>
      |            ^~~
a.cc:35:11: error: redefinition of 'const long long int mod'
   35 | const int mod=1e9+7;
      |           ^~~
a.cc:24:11: note: 'const long long int mod' previously defined here
   24 | const int mod=1e9+7;
      |           ^~~
a.cc:36:11: error: redefinition of 'const long long int inf'
   36 | const int inf=1e18+7;
      |           ^~~
a.cc:25:11: note: 'const long long int inf' previously defined here
   25 | const int inf=1e18+7;
      |           ^~~
a.cc:38:8: error: redefinition of 'int main()'
   38 | signed main(){
      |        ^~~~
a.cc:27:8: note: 'int main()' previously defined here
   27 | signed main(){
      |        ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  ld x=6.28318530717958623200;
  ld r;
  cin>>r;
   r=x*r
    cout<<r<<endl;
  return 0;}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'ld' was not declared in this scope
    5 |   ld x=6.28318530717958623200;
      |   ^~
a.cc:6:5: error: expected ';' before 'r'
    6 |   ld r;
      |     ^~
      |     ;
a.cc:7:8: error: 'r' was not declared in this scope
    7 |   cin>>r;
      |        ^
a.cc:8:6: error: 'x' was not declared in this scope
    8 |    r=x*r
      |      ^
Language: C

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

#define debug(var)  do{ std::cout << #var << " : "; view(var); }while(0)
using ll = long long;
using ld = long double;
inline int num (const std::string& S, int idx) noexcept { return S.at(idx) - '0'; }
inline int ctoi(char c) noexcept { return c - '0'; }
inline bool isNumber(char c) noexcept { return ('0'<c && c<'9'? true : false); }
inline int safeCtoi(char c) { if(isNumber(c)) { return ctoi(c); } else { throw 1; } }
inline char itoc(int i) noexcept { return i + '0'; }
inline unsigned int bitMask(int i) noexcept { return (1 << i); }
inline bool isTrue(unsigned int bit, int i) noexcept { return bit & bitMask(i); }
inline bool isEven(int num) noexcept { return !num%2; }
inline bool isOdd(int num) noexcept { return num%2; }
template<typename T> inline short sgn(T num) noexcept { return (num==0? 0 : (num>0? 1 : -1) ); }
template<typename T> inline bool isZero(T num) noexcept { return (num==0? true : false); }
template<typename T> inline bool isPositive(T num) noexcept { return (num>0? true : false); }
template<typename T> inline bool isNegative(T num) noexcept { return (num<0? true : false); }
template<typename T> void view(T e) noexcept { cout << e; }
template<typename T> void view(std::vector<T> v) noexcept { for(const auto& e : v) cout << e << " "; }
template<typename T> void view(std::vector<std::vector<T>> vv) noexcept { for(const auto& v : vv) view(v); }


int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	double r;
	cin >> r;
	cout << 2 * M_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>
#include<cmath>
using namespace std;

int main()
{
    int i;

    cin>>i;
    double o = 2*3.1416*i;
    cout<<o<<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>
#include <math.h>

int main(){
  int R;
  scanf_s("%d",&R);
  
  double circle;
  circle = 2 * R * M_PI;
  
  printf("%lf \n",circle);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:6:3: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    6 |   scanf_s("%d",&R);
      |   ^~~~~~~
      |   scanf
Language: C

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

using namespace std;

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


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


using namespace std;
 
int main() {
  int R;
 cin >> R;
    
    
    
    cout <<R* 3.141592 << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:2: error: 'cin' was not declared in this scope
    6 |  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 | 
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout <<R* 3.141592 << endl;
      |     ^~~~
a.cc:10:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:27: error: 'endl' was not declared in this scope
   10 |     cout <<R* 3.141592 << endl;
      |                           ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 |
Language: C

int r;
scanf("%d",&r);
int ans = 2*r*3.14 ;
printf("%d",ans);

Compiler output:
main.c:2:7: error: expected declaration specifiers or '...' before string constant
    2 | scanf("%d",&r);
      |       ^~~~
main.c:2:12: error: expected declaration specifiers or '...' before '&' token
    2 | scanf("%d",&r);
      |            ^
main.c:3:11: error: initializer element is not constant
    3 | int ans = 2*r*3.14 ;
      |           ^
main.c:4:8: error: expected declaration specifiers or '...' before string constant
    4 | printf("%d",ans);
      |        ^~~~
main.c:4:13: error: expected declaration specifiers or '...' before 'ans'
    4 | printf("%d",ans);
      |             ^~~
Language: C

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

int main(){
    int r;
    float length;

    scanf("%d", &r);
    
    length = 2 * M_PI * r
    printf("%g", &length);

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:26: error: expected ';' before 'printf'
   10 |     length = 2 * M_PI * r
      |                          ^
      |                          ;
   11 |     printf("%g", &length);
      |     ~~~~~~