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

\#include <algorithm>

\#include <iostream>

\#include <string>

using namespace std;

\#define PI 3.14159265359

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

int main() {  

int R;  

cin >> R;  

double ans = 2  *PI*  R;  

cout << ans << endl;  

return 0;

}

Compiler output:
a.cc:1:1: error: stray '\' in program
    1 | \#include <algorithm>
      | ^
a.cc:1:2: error: stray '#' in program
    1 | \#include <algorithm>
      |  ^
a.cc:3:1: error: stray '\' in program
    3 | \#include <iostream>
      | ^
a.cc:3:2: error: stray '#' in program
    3 | \#include <iostream>
      |  ^
a.cc:5:1: error: stray '\' in program
    5 | \#include <string>
      | ^
a.cc:5:2: error: stray '#' in program
    5 | \#include <string>
      |  ^
a.cc:9:1: error: stray '\' in program
    9 | \#define PI 3.14159265359
      | ^
a.cc:9:2: error: stray '#' in program
    9 | \#define PI 3.14159265359
      |  ^
a.cc:11:1: error: stray '\' in program
   11 | \#define rep(i, n) for (int i = 0; i < (int)(n); i++)
      | ^
a.cc:11:2: error: stray '#' in program
   11 | \#define rep(i, n) for (int i = 0; i < (int)(n); i++)
      |  ^
a.cc:13:14: error: extended character   is not valid in an identifier
   13 | int main() {  
      |              ^
a.cc:15:8: error: extended character   is not valid in an identifier
   15 | int R;  
      |        ^
a.cc:17:11: error: extended character   is not valid in an identifier
   17 | cin >> R;  
      |           ^
a.cc:19:26: error: extended character   is not valid in an identifier
   19 | double ans = 2  *PI*  R;  
      |                          ^
a.cc:21:22: error: extended character   is not valid in an identifier
   21 | cout << ans << endl;  
      |                      ^
a.cc:1:3: error: 'include' does not name a type
    1 | \#include <algorithm>
      |   ^~~~~~~
a.cc:9:3: error: 'define' does not name a type
    9 | \#define PI 3.14159265359
      |   ^~~~~~
a.cc:11:36: error: 'i' does not name a type
   11 | \#define rep(i, n) for (int i = 0; i < (int)(n); i++)
      |                                    ^
a.cc:11:50: error: 'i' does not name a type
   11 | \#define rep(i, n) for (int i = 0; i < (int)(n); i++)
      |                                                  ^
Language: C

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

template<typename T>
istream& operator >> (istream& istr, vector<T>& v){
    for(T& x: v) istr >> x;
    return istr;
}

template<typename T, typename U>
istream& operator >> (istream& istr, pair<T,U>& p){
    istr >> p.first >> p.second;
    return istr;
}

template<typename T>
ostream& operator << (ostream& ostr, vector<T>& v){
    if(!v.empty()){
        ostr << v.front();
        for(auto itr = ++v.begin(); itr != v.end(); itr++)
            // ostr << *itr;
            ostr << " " << *itr;
    }
    return ostr;
}

template<typename T, typename U>
ostream& operator << (ostream& ostr, pair<T,U>& p){
    // ostr << p.first << p.second;
    // ostr << p.first << ", " << p.second;
    ostr << "(" << p.first << ", " << p.second << ")";
    return ostr;
}

template<typename T>
ostream& operator << (ostream& ostr, vector<vector<T>>& vv){
    if(!vv.empty()){
        ostr << vv.front();
        for(auto itr = ++vv.begin(); itr != vv.end(); itr++)
            ostr << endl << *itr;
    }
    return ostr;
}

template<typename T, typename U>
ostream& operator << (ostream& ostr, vector<pair<T,U>>& vp){
    if(!vp.empty()){
        ostr << vp.front();
        for(auto itr = ++vp.begin(); itr != vp.end(); itr++)
            ostr << endl << *itr;
    }
    return ostr;
}

typedef long long ll;
typedef vector<ll> vll;
typedef vector<char> vc;
typedef vector<double> vd;
// vll v(n); v[i]=x;
typedef vector<vll> vvll;
typedef vector<vc> vvc;
typedef vector<vd> vvd;
// vvll v(m,vll(n)); v[i][j]=x;
typedef pair<ll,ll> pll;
typedef pair<double,double> pd;
typedef vector<pll> vpll;
typedef vector<pd> vpd;
// vpll v(n); v[i]=make_pair(x,y); v[i].first/second;
// v.front() : v[0]
// v.back()  : v[v.size()-1]

#define PI 3.1415926535897932
#define EPS 1e-12
#define INF ((ll)1e+12)
#define REP(i,n) for(ll i=0; i<(n); i++)
#define RREP(i,n) for(ll i=(n)-1; i>=0; i--)
#define FOR(i,a,b) for(ll i=(a); i<=(b); i++)
#define FORR(i,a,b) for(ll i=(b); i>=(a); i--)
#define fix(x) cout << fixed << setprecision(x)
#define dump(x) cout << #x << " = " << (x) << endl
#define all(x) (x).begin(),(x).end()

template<typename T> T sum(vector<T>& v){return accumulate(all(v), (T)0);}
template<typename T> inline void sort(vector<T>& v){sort(all(v));}
template<typename T> inline void rsort(vector<T>& v){sort(all(v), greater<T>());}
template<typename T> inline void chmin(T& a, T b){if(a>b) a=b;}
template<typename T> inline void chmax(T& a, T b){if(a<b) a=b;}

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


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

#include<bits/stdc++.h>
using namespace std;
int main(){
	double n,pi=3.141592653589793238;
	cin>>n;
	cout<<(2*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 <bits/stdc++.h>
using namespace std;


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

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

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.Scanner;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.Scanner;
      |            ^
main.c:2:1: error: unknown type name 'class'
    2 | class Main{
      | ^~~~~
main.c:2:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    2 | class Main{
      |           ^
Language: Java

public class CodeForces 
{
    public static void main(final String args[]) {
        final Scanner s = new Scanner(System.in);
        int r=s.nextInt();
        double ans=3.14159265;
        ans=ans*2.0;
        System.out.println(ans*r);
    }
}

Compiler output:
Main.java:1: error: class CodeForces is public, should be declared in a file named CodeForces.java
public class CodeForces 
       ^
Main.java:4: error: cannot find symbol
        final Scanner s = new Scanner(System.in);
              ^
  symbol:   class Scanner
  location: class CodeForces
Main.java:4: error: cannot find symbol
        final Scanner s = new Scanner(System.in);
                              ^
  symbol:   class Scanner
  location: class CodeForces
3 errors
Language: Java

	static int R;
	static double L;
	public static void main(String args[]){
		Scanner scanner =new Scanner(System.in);
		System.out.println("R");
		R=scanner.nextInt();
		L=R*2*3.14;
		System.out.println(L);
	}


Compiler output:
Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
	static int R;
	       ^
  (use --enable-preview to enable unnamed classes)
1 error
Language: C

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

int main()
{
    int i;
    double o;
    cin>>i;
    o = abs(i*6.28);
    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<bits/stdc++.h>
using namespace std;
# define PI           3.141592653589
int main(){
  int r;
  cin>>r;
double cir =(2*PI*r); 
  cout<<cir;

}


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

#include<iostream>
#include<iomanip>
#include<cassert>
#include<math.h>
#include<complex>
#include<algorithm>
#include<utility>
#include<queue>
#include<string.h>
#include<string>
#include<set>
#include<map>
#include<unordered_map>
#include<functional>
#include<vector>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
const ll INF=2e18;
const ll MOD=1e9+7;

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


    return 0;
}

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

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

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

nclude<bits/stdc++.h>
using namespace std;
int main()
{
 
float a;
cin >> a;
printf("%.4f\n",2*3.1415*a);
 
 
 
 
}
 

Compiler output:
a.cc:1:1: error: 'nclude' does not name a type
    1 | nclude<bits/stdc++.h>
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:7:1: error: 'cin' was not declared in this scope
    7 | cin >> a;
      | ^~~
a.cc:8:1: error: 'printf' was not declared in this scope
    8 | printf("%.4f\n",2*3.1415*a);
      | ^~~~~~
a.cc:1:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | nclude<bits/stdc++.h>
Language: Java

import java.util.*;

public class AtCoder163 {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int q = s.nextInt();
        double ans = 2 * 3.14159 * q;
        System.out.println(ans);
    }
}

Compiler output:
Main.java:3: error: class AtCoder163 is public, should be declared in a file named AtCoder163.java
public class AtCoder163 {
       ^
1 error
Language: C

#include <iostream>
#include <bits/stdc++.h>

using namespace std;
const int INF = 0x3f3f3f3f;


int main() {
	int r;
	double pi = 3.1415926535897;
	cin >> r;
	cout << 2*r*pi << 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;
 
int main() {
  double R;
  cin >> R;
  cout << 2*R*3.14 << endl;
}



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

#include <bits/stdc++.h>
#define rep(i,m,n) for(int i=m;i<n;i++)
#define fix(n) cout<<fixed<<setprecision(n)
#define co(n) cout<<n<<endl
#define all(n) (n).begin(),(n).end()
using namespace std;
typedef long long ll;
const ll mod=1000000007;

int main(){
  double pi=3.1415926535;
  double n;
  fix(12);
  cin>>n;
  n*=2*pi
  co(n);
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:10: error: expected ';' before 'cout'
   15 |   n*=2*pi
      |          ^
      |          ;
Language: C

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

int main() {
  cin >> R;
  cout << R * 2 * M_PI << 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; 
  
#define PI 3.1415 
  
double circumference(double r) 
{ 
    double cir = 2*PI*r; 
    return cir; 
} 
  
// driver function 
int main() 
{ 
  double r;
  cin>>r;
  cout << "Circumference = " 
       << circumference(r); 
  return 0; 
}  

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:16:3: error: 'cin' was not declared in this scope
   16 |   cin>>r;
      |   ^~~
a.cc:17:3: error: 'cout' was not declared in this scope
   17 |   cout << "Circumference = "
      |   ^~~~
Language: C

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define REP(i,n) for(ll i=0;i<(ll)(n);i++)
#define REPD(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define FOR(i,a,b) for(ll i=(a);i<=(b);i++)
#define FORD(i,a,b) for(ll i=(a);i>=(b);i--)
#define ALL(x) (x).begin(),(x).end() //sortなどの引数を省略したい
#define SIZE(x) ((ll)(x).size()) //sizeをsize_tからllに直しておく
#define MAX(x) *max_element(ALL(x))
#define INF 1000000000000
#define MOD 10000007
#define PB push_back
#define MP make_pair
#define F first
#define S second
int main() {
    int r; cin >> r;
    cout << 2*M_PI*r << endl;
}

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

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

int main() {
    ll 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>
using namespace std;
typedef long long ll;
const int MOD = 1000000007;
const double PI=3.14159265358979323846;

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

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

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

int main() {
    int n;
    cin>>n;
    cout<<(2*n)*PI;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: 'PI' was not declared in this scope
    8 |     cout<<(2*n)*PI;
      |                 ^~
Language: C

R = input()
print(R*3.1415926)


Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | R = input()
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'R' [-Wimplicit-int]
main.c:1:5: error: implicit declaration of function 'input' [-Wimplicit-function-declaration]
    1 | R = input()
      |     ^~~~~
main.c:1:5: error: initializer element is not constant
main.c:2:1: error: expected ',' or ';' before 'print'
    2 | print(R*3.1415926)
      | ^~~~~
Language: C

#include <bits/stdc++.h>
using namespace std;
const double pi = acos(-1);

int main(){
	double r;
	cin >> r;
	printf("%lf", 2.0 * r * pi);
	return 0;
}

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

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

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

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

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

int main() {
  int r;
  cin >> r;
  double pi = 6.28318530717958623200/2; 

  cout << setprecision(10) << 2*pi*r << endl;
}


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

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

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

r = int(input())
print(2*3.14*r)

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<stdio.h>

#include<iostream>
#include<stdlib.h>
using namespace std;


int main(){
  double PI=3.14159265358979323846;
  double R;
  scanf("%lf",&R);

  printf("%lf\n",2*PI*R);

  return 0;
}


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

#include <iostream>
using namespace std;

const double pi = 3.14159265359;

int R;
double res;

int main() {
    cin>>R;
    res = 2.0*pi*R;
    cout<<res;
    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<chrono>
using namespace std;
using ll = long long;

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

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

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

int main()[
double R=0;
double L=0;

scanf("%lf", &R);

L=2*M_PI*R;

printf("%lf", L);

]

Compiler output:
main.c:5:1: error: expected expression before 'double'
    5 | double R=0;
      | ^~~~~~
Language: C

//#pragma GCC optimize ("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("avx,avx2,fma")


#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define pb push_back
#define F first
#define S second
#define ins insert
#define mp make_pair
#define bit __builtin_popcount
#define md (l + ((r - l) / 2))
#define all(x) x.begin(),x.end()
#define eb emplace_back
#define ub upper_bound
#define lb lower_bound
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define sqr(x) (x*x)

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;


using ll = long long;

//#define int ll


const int N = 1e5+33, mod = 1e9 + 7, mod2 = 998244353;
const int MAX = 1e5 + 11;
const int INF1 = 2e9 + 11;
const ll INF2 = 2e18 + 11;
const double INF3 = 1e8 + 11;
const int base = 500;
const int P = 31;
const int dx[] = {1, -1, 0, 0, 1, 1, -1, -1};
const int dy[] = {0, 0, 1, -1, 1, -1, 1, -1};
const char pxy[] = {'R' , 'L' , 'D' , 'U'};
const double EPS = 1e-4;
const double PI = acos(-1.0);

template<typename T> using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T1, typename T2> inline void chmin(T1 &a, T2 b) { if (a > b) a = b; }
template<typename T1, typename T2> inline void chmax(T1 &a, T2 b) { if (a < b) a = b; }


typedef pair <int, int> pii;        // #include <ext/pb_ds/assoc_container.hpp>
typedef pair <ll, ll> pll;         // #include <ext/pb_ds/tree_policy.hpp>
typedef vector <int> vi;          // #include <ext/rope>
                // #include <ext/rope>
                                 // #include <ext/rope>
bool prime(int n) {             // template<typename T> using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
    for(int i=2;i<=sqrt(n);i++){
        if(n%i==0){return 0;}
    }return 1;}
ll bp(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}

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

/*
*/

main() {
    ios;
    int tt = 1;
//    cin >> tt;
    while(tt --) {
        solve();
        cout << '\n';
    }
    return 0;
}
/*
++>
+++>
<[<+>-]<
++++++++++++++++++++++++++++++++++++++++++++++++.

500000000000000000000000000000000000000000000000

1 1 2 3 6


*/


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

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

}


Compiler output:
a.cc:42:5: error: redefinition of 'int main()'
   42 | int main()
      |     ^~~~
a.cc:17:5: note: 'int main()' previously defined here
   17 | int main()
      |     ^~~~
Language: C

#include <stdio.h>
#define PI 3.1415926
main()
{int i;
scanf("%d,&i);
printf("%f",PI*i*2);
}

Compiler output:
main.c:3:1: error: return type defaults to 'int' [-Wimplicit-int]
    3 | main()
      | ^~~~
main.c: In function 'main':
main.c:5:7: warning: missing terminating " character
    5 | scanf("%d,&i);
      |       ^
main.c:5:7: error: missing terminating " character
    5 | scanf("%d,&i);
      |       ^~~~~~~~
main.c:6:20: error: expected ')' before ';' token
    6 | printf("%f",PI*i*2);
      |                    ^
      |                    )
main.c:5:6: note: to match this '('
    5 | scanf("%d,&i);
      |      ^
main.c:6:1: error: passing argument 1 of 'scanf' makes pointer from integer without a cast [-Wint-conversion]
    6 | printf("%f",PI*i*2);
      | ^~~~~~~~~~~~~~~~~~~
      | |
      | int
In file included from main.c:1:
/usr/include/stdio.h:428:42: note: expected 'const char *' but argument is of type 'int'
  428 | extern int scanf (const char *__restrict __format, ...) __wur;
      |                   ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
main.c:6:21: error: expected ';' before '}' token
    6 | printf("%f",PI*i*2);
      |                     ^
      |                     ;
    7 | }
      | ~
Language: C

#include "bits/stdc++.h"
using namespace std;
#ifdef LOCAL
#define debug(x)   cerr<<#x<<" = "<<x<<endl
#else
#define debug(x) 
#endif
#define IOS ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define input_from_file freopen("input.txt","r",stdin)
#define output_to_file freopen("output.txt" , "w",stdout)
#define pii pair<int,int>
#define endl '\n'
#define pb push_back
#define fi first
#define se second 
#define mp make_pair
#define int long long
const int inf = 1e18 + 5;
signed main()
{
    #ifdef LOCAL
        input_from_file;
        output_to_file;
    #endif 
    IOS
    int r; cin>>r;
    double pi = 3.14159265359;
    double ans = 2*pi*r;
    cout<<fixed<<setprecision(20)<<ans<<endl;
    return 0;
}

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

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

//**************************************************************************************************************************************************************************
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
//**************************************************************************************************************************************************************************
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define mod 1000000007
#define pi acos(-1.0)
#define eps 1e-9
#define inf 1e18
#define sz(x) (int)((x).size())
#define gcd(a, b) __gcd(a, b)
#define LCM(x, y) (((x) / __gcd((x), (y))) * (y))
#define mem(x, n) memset(x, n, sizeof(x))
#define setbits(x) __builtin_popcountll(x)
#define zrobits(x) __builtin_ctzll(x)
#define ps(x, y) fixed << setprecision(y) << x
#define FastIO ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//**************************************************************************************************************************************************************************

void c_p_c()
{
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
}

void solve()
{
   int n;
   cin>>n;
   double r = 2*pi*n;
   cout<<ps(r,16)<<endl;
}

int main(int argc, char const *argv[])
{
   // c_p_c();
    FastIO;
    int t = 1;
    //cin>>t;
    for (int i = 0; i < t; 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 <vector>
#include <cmath>
#include <iostream>

using namespace std;

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

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

#include<bits/stdc++.h>
using namespace std;
const double pi=3.14;
int main()
{
  int r;cin>>r;
  cout<<r*2*pi;
  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 namespase std;
int R;
double c;
cin >> R;
c = R * 2 * 3.1415926
cout << c << endl;

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namespase'
    2 | using namespase std;
      |       ^~~~~~~~~
a.cc:5:1: error: 'cin' does not name a type
    5 | cin >> R;
      | ^~~
a.cc:6:1: error: 'c' does not name a type
    6 | c = R * 2 * 3.1415926
      | ^
Language: Java

import java.util.*;
public class MainA {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int R = sc.nextInt();		
		System.out.println(2*R*Math.PI);
	}
}

Compiler output:
Main.java:2: error: class MainA is public, should be declared in a file named MainA.java
public class MainA {
       ^
1 error
Language: C

#include<iostream>
#include<cstdio>
#include<cmath>
#include<algorithm>
#include<stack>
#include<queue>
using namespace std;

#define read(x) scanf("%d",&x)
#define readl(x) scanf("%lld",&x)
#define ll long long 
#define ull unsigned long long

double pi=acos(-1.0);
double n; 

int main()
{
	cin>>n;
	printf("%.20lf\n",2*n*pi); 
	return 0;
} 

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

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

using namespace std;

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

	cout << (2.0 * M_PI * (double)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 <iostream>
#include <ios>
#include <iomanip>
#include <algorithm>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <utility>
#include <typeinfo>
using namespace std;

#define MOD 1000000007
#define INF 1e9+7
#define INF_LONG 1e18
#define rep(i, n) for(int i=0; i<n; ++i)
#define rrep(i, m, n) for(int i=m; i<n; ++i)
typedef long long ll;

#define MAX_N 200000
#define MAX_M 100000
#define MAX_V 100
#define MAX_E 100
#define MAX_Q 100000

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

int ddx[] = {-1, 0, 1, 0, -1, 1, -1, 1};
int ddy[] = {0, -1, 0, 1, 1, 1, -1, -1};

ll gcd(ll x, ll y) {
  if(y==0) return x;
  else return gcd(y, x%y);
}

ll lcm(ll x, ll y) {
  return (x*y)/gcd(x, y);
}

//--------------------------

int main() {

  double r;
  cin >> r;

  cout << 2*r*PI << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:55:15: error: 'PI' was not declared in this scope
   55 |   cout << 2*r*PI << endl;
      |               ^~
Language: C

#include<iostream>
#include<algorithm>
#include<vector>
#include<math.h>
int main(){
    int r;
    scanf("%d",&r);
    double A;
    const double PI  =3.141592653589793238463;
    A = (double)PI * 2 * r;
    printf("%.20f",A);
    return 0;
}

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

#include <iostream>

using namespace std;
int main (){cin.tie(0);
cin.sync_with_stdio(0);

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


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

import java.util.*; 
import java.lang.*; 

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

Compiler output:
Main.java:8: error: cannot find symbol
		int R = scan.nextint();
		            ^
  symbol:   method nextint()
  location: variable scan of type Scanner
1 error
Language: C

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

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

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:18: error: invalid operands of types 'const char [5]' and 'int' to binary 'operator*'
    7 |   cout << "6,28" * R << endl;
      |           ~~~~~~ ^ ~
      |           |        |
      |           |        int
      |           const char [5]
Language: C

#include <bits/stdc++.h>

using namespace std;

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

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;
  double pi == 3.1415926535897;
  cout<<2*pi*r;
  
  
  return 0;  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: expected initializer before '==' token
    7 |   double pi == 3.1415926535897;
      |             ^~
a.cc:8:11: error: 'pi' was not declared in this scope
    8 |   cout<<2*pi*r;
      |           ^~
Language: C

#include <bits/stdc++.h>

using namespace std;

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

  cout << 2 * 3.141592653589 * r << endl;
}


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

#include<bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef pair<int,int> pii;
typedef vector< pii > vii;

#define ll          long long
#define ff          first
#define ss          second
#define pb          push_back
#define mkp         make_pair
#define sz          size()

#define forf(a,b,c)    for(int i=a;i<=b;i+=c)
#define forr(a,b,c)    for(int i=a;i>=b;i-=c)
#define all(a)      a.begin(),a.end()
#define mem(a,b)    memset(a,b,sizeof(a))
#define pi          2*acos(0.0)
#define End         return 0;

#define scan1(a)    scanf("%d",&a)
#define scan2(a,b)  scanf("%d %d",&a,&b)
#define scan3(a,b,c)  scanf("%d %d %d",&a,&b,&c)
#define scanl(a)    scanf("%lld",&a)
#define scanll(a,b) scanf("%lld %lld",&a,&b)
#define scanlll(a,b,c) scanf("%lld %lld %lld",&a,&b,&c)

#define print1(a)    printf("%d",a)
#define print2(a,b)  printf("%d %d",a,b)
#define print3(a,b,c)  printf("%d %d %d",a,b,c)
#define printl(a)    printf("%lld",a)
#define printll(a,b) printf("%lld %lld",a,b)
#define printlll(a,b,c) printf("%lld %lld %lld",a,b,c)

#define MAXN        100000007
#define INF 0x3f3f3f3f
//int dx[]={+1,-1,+0,+0};///Four Directions
//int dy[]={+0,+0,+1,-1};///Four directions
//int dx [] = {+1,-1,+0,+0,-1,-1,+1,+1};///Eight Directions
//int dy [] = {+0,+0,+1,-1,+1,-1,-1,+1};///Eight Directions

//int mark[10007];vi prime;void seive(){for(int i=2;i<10000;i++){if(mark[i]==0){prime.pb(i);for(int j=i+i;j<=10000;j+=i)mark[j]=1;}}}

//freopen("input.txt", "r", stdin);

int main()
{
   ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
   double r;
   cin>>r;
   cout<<2*pi*r<<endl;

   End;
}


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

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

int main()
{
    int i;
    double o;
    cin>>i;
    o = (i*6.28318530717958623200);
    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 <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define INF (INT_MAX / 4)
#define REP(i, n) for (ll i = 0, i##_len = (n); i < i##_len; ++i)
#define ALL(a) (a).begin(), (a).end()
/* clang-format off */
#define TIMER_S(start) chrono::system_clock::time_point start = chrono::system_clock::now();
#define TIMER_E(end) chrono::system_clock::time_point end = chrono::system_clock::now();
#define TIME(start, end) cout << static_cast<double>(chrono::duration_cast<chrono::microseconds>(end - start).count()) << "ms" << "\n";
/* clang-format on */

int main() {
  double r;
  cin >> r;
  cout << 2 * 3.14159265358979 * 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>
#define For(i,a,b) for(int i=(a); i<(b); i++)
using namespace std;

const double pi=3.1415926;

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

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

int main(void){
  int R;
  float L;
  scanf("%d", &R);
  L=4*M_PI*R*R;
  printf("%f", L);
  
  return 0;
}

Compiler output:
main.c:1:2: error: invalid preprocessing directive #insclude; did you mean #include?
    1 | #insclude <stdio.h>
      |  ^~~~~~~~
      |  include
main.c: In function 'main':
main.c:7:3: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    7 |   scanf("%d", &R);
      |   ^~~~~
main.c:3:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
    2 | #include <math.h>
  +++ |+#include <stdio.h>
    3 | 
main.c:7:3: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    7 |   scanf("%d", &R);
      |   ^~~~~
main.c:7:3: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:9:3: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    9 |   printf("%f", L);
      |   ^~~~~~
main.c:9:3: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:9:3: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:9:3: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

#include <bits/stdc++.h>

using namespace std;

int main()
{
    double R;

    cin >> R;

    cout << 2.00*3.141592*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(){
	int n;
	cin>>n;
	double x=2*n*3.14159265358979323846;
	
	cout<<fixed<<setprecision(20)<<x<<endl;
	return 0;
}

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

import java.util.Scanner;

public class CirclePond {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double radius = scan.nextInt();
        double result = 2 * 3.14 * radius;
        
        System.out.println(result);
    }
}


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

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:8:15: error: expected ';' before 'cout'
    8 |   c = M_PI*2*R
      |               ^
      |               ;
    9 |   cout << c << endl;
      |   ~~~~
Language: C

#include <cstdio>
#include <cmath>

int main() {
  double r;
  scanf("%lf", &r);
  printf("%lf", 2 * r * M_PI);
  return 0;
}

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

#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
using namespace std;
const int N = 2e5 + 500;
#define ll long long
int main(){
	double n;
	cin >> n;	
	double ans = 2 * 3.14 * n * n;
	cout << ans << endl;
}

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

import java.util.*;
public class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int r = sc.nextInt();
        //int b = sc.nextInt();
        //int c = sc.nextInt();
        //String s = sc.next();
 
/*        if(N%2 != 0){
        for(int i = 1; i <= N; i++){
            for(int j = i; j <= N; j++){
                c = i*j;
                if(c == N){
                    d = i+j-2;
                    if(min == 0 || min > d) min = d;
            }
        }
    }
}*/
double R = (double)r * Math.PI * 2;
    System.out.println(R);
 
    }

Compiler output:
Main.java:24: error: reached end of file while parsing
    }
     ^
1 error
Language: Java

ort java.util.Scanner;
class Main{
	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:1: error: class, interface, enum, or record expected
ort java.util.Scanner;
^
1 error
Language: C

#include<bits/stdc++.h>
using namespace std;
void PDF(double r)
{
    double pi = 3.1416;
    double area;
    area = 2 * pi * r;
    cout << area << endl;
}
int main()
{
    double n,i,j,l;
    cin >> n;
    PDF(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

import math

r = int(input())

c = 2*math.pi*r

print(c)

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++

using namespace std;

int main(){
	double pi = 3.141592;
	int n;
	cin >> n;

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


Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope
    6 |         cin >> n;
      |         ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:8:9: error: 'cout' was not declared in this scope
    8 |         cout << 2 * pi*n << endl;
      |         ^~~~
a.cc:8:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:8:29: error: 'endl' was not declared in this scope
    8 |         cout << 2 * pi*n << endl;
      |                             ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C

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

int main(){
  int n;
  cin >> n;
  cin.ignore();

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


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

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define mod 1000000007

int main() {

    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

    ll t = 1;
    //cin>>t;

    while(t--) {
        double r;
        cin>>r;

        double ans = 2 * r * (3.14159);
        cout<<ans<<"\n";

    }

}



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

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

int main(){
 double R;
  cin >> R;
double answer = R*2*3.1415926535897932;
  cout << answer << endl;
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> R;
      |   ^~~
a.cc:8:3: error: 'cout' was not declared in this scope
    8 |   cout << answer << endl;
      |   ^~~~
a.cc:8:21: error: 'endl' was not declared in this scope
    8 |   cout << answer << endl;
      |                     ^~~~
Language: Java

public class main {
	static int R;
	static double L;
	public static void main(String args[]){
		Scanner scanner =new Scanner(System.in);
		R=scanner.nextInt();
		L=R*2*3.14;
		System.out.println(L);
	}
}


Compiler output:
Main.java:1: error: class main is public, should be declared in a file named main.java
public class main {
       ^
Main.java:5: error: cannot find symbol
		Scanner scanner =new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class main
Main.java:5: error: cannot find symbol
		Scanner scanner =new Scanner(System.in);
		                     ^
  symbol:   class Scanner
  location: class main
3 errors
Language: C++

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

int main() {
  int n;
cin >> n;
    double pi = 3.141592;
    double ans = n * 2 * pi;

    co(ans);

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'co' was not declared in this scope; did you mean 'cos'?
   10 |     co(ans);
      |     ^~
      |     cos
Language: C

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

using namespace std;

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

  printf("%.20f", r * 2 * M_PI);

  return 0;
}

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

import java.util.Scanner;
public class Dreamoon{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		int rad = input.nextInt();
		System.out.println(String.format("%.2f",(2 * Math.PI * rad)));
		
	}
}

Compiler output:
Main.java:2: error: class Dreamoon is public, should be declared in a file named Dreamoon.java
public class Dreamoon{
       ^
1 error
Language: C

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

#define ll long long int
#define pb push_back
#define fi first
#define se second
#define mp make_pair
#define mt make_tuple
#define all(A) A.begin(), A.end()
#define sz(A) (int)A.size()
typedef vector <int> vi;
typedef vector <ll> vl;
typedef pair <int, int> pii;
const ll mod = 1e9 + 7;
//const ll mod = 998244353;
const int inf = 1e9;
//const ll inf = 1e18;
const int N = 2e5;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	long double pi = 3.14159265358979323846;
	ll r;
	cin >> r;
	cout << 2 * pi * r << "\n";
 	return 0;
}

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

#include<bits/stdc++.h>
#include<math.h>

#include <cmath>
using namespace std;
int main()
{

const double PI = 3.141592653589793;
    int n;
    cin>>n;
 cout<<2*PI*n<<endl;
    return 0;
}


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

#include<iostream>
#include<vector>
#include<string>
#include<math.h>
#include <iomanip>
using namespace std;

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

int main(){

	ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    ll t;
    cin>>t;

    cout<< fixed << setprecision(20)<<(double)(2*M_PI*(double)t);
	return 0;
}

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

#include<bits/stdc++.h>
using namespace std;
int main(){
double n;
cin>>n;
cout<<2*n*22/7;
}


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

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int r;
	cin>>r;
	float cir = ((2*r*22)/7.0);
	cout<<cir;
}

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

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

int main(){
    int R;
    long double pi= 3.1415926535;
    cin >> R;
    cout << (long double)2*pi*R << endl;
    return 0;
}

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

#include<iostream>
using namespace std;

int main()
{
    double n;
    scanf("%lf",&n);
    printf("%.20lf\n",n*2*3.141592653589793238462);
    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 namesace std;
int main(){
  long double r;
  cin>>r;
  long double y=  3.14159265358979323846;
  cout<<2*y*r<<"\n";
  return 0;
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namesace'
    2 | using namesace std;
      |       ^~~~~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>r;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 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:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout<<2*y*r<<"\n";
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~