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


import javafx.util.Pair;

import java.math.BigInteger;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        long m;
        double n;
        m=in.nextLong();
        n=in.nextDouble();
        System.out.println((long)(m*n));
    }

}












Compiler output:
Main.java:2: error: package javafx.util does not exist
import javafx.util.Pair;
                  ^
1 error
Language: C++

#include <iostream>
#include <algorithm>
#define flush fflush(stdout)
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
typedef pair<ll, ll> Pl;
const int mod = (int)1e9 + 7, INF = (int)1e9;
const int di[4] = { 1,0,-1,0 }, dj[4] = { 0,1,0,-1 };


int main(void) {
    double a, b, ans;

    scanf("%lf%lf", &a, &b);

    b *= 100;
    ans = floor(a * b / 100);

    printf("%lld\n", (ll)ans);

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:11: error: 'floor' was not declared in this scope
   18 |     ans = floor(a * b / 100);
      |           ^~~~~
Language: C

#include<stdio.h>
int main(){
    float a;
    float b;
    scanf("%f %f",&a,&b);
    a=a*b;
    int c=a:
    printf("%d\n",c);
}

Compiler output:
main.c: In function 'main':
main.c:7:12: error: expected ',' or ';' before ':' token
    7 |     int c=a:
      |            ^
Language: Java


package CodeForce;

import javafx.util.Pair;

import java.math.BigInteger;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        long m;
        double n;
        m=in.nextLong();
        n=in.nextDouble();
        System.out.println((long)(m*n));
    }

}












Compiler output:
Main.java:4: error: package javafx.util does not exist
import javafx.util.Pair;
                  ^
1 error
Language: C++

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

void Multiplication1() {
	int A, B;
	cin >> A >> B;
	cout << A * B;
}

void Multiplication2() {
	int N;
	long long int* A;
	long long int ans = 1;
	cin >> N;
	A = new long long int[N];
	for (int i = 0; i < N; i++) cin >> A[i];
	for (int i = 0; i < N; i++) ans *= A[i];
	if (ans > (long long int)pow(10, 18)) {
		cout << -1;
		return;
	}
	cout << ans;
	delete[] A;
}

void Multiplication3() {
	long long int A, ans;
	long float B;
	cin >> A >> B;
	ans = A * B;
	cout << ans;
}


int main() {
	Multiplication3();
}

Compiler output:
a.cc: In function 'void Multiplication2()':
a.cc:19:34: error: 'pow' was not declared in this scope
   19 |         if (ans > (long long int)pow(10, 18)) {
      |                                  ^~~
a.cc: In function 'void Multiplication3()':
a.cc:29:9: error: 'long' specified with 'float'
   29 |         long float B;
      |         ^~~~
Language: Java

import java.util.*;
public class Main{
  public static void main(String [] args){
    Scanner sc = new Scanner(System.in);
    long a = sc.nextLong();
    float b = sc.nextFloat();
    long res = long(a*b);
    System.out.println(res);
  }
}

Compiler output:
Main.java:7: error: '.class' expected
    long res = long(a*b);
                   ^
Main.java:7: error: not a statement
    long res = long(a*b);
                     ^
Main.java:7: error: ';' expected
    long res = long(a*b);
                       ^
3 errors
Language: C

#include<stdio.h>
int main(){
    float a;
    float b;
    scanf("%d %f",&a,&b);
    a=a*b;
    int c=a:
    printf("%d\n",c);
}

Compiler output:
main.c: In function 'main':
main.c:7:12: error: expected ',' or ';' before ':' token
    7 |     int c=a:
      |            ^
Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <map>
using namespace std;
using ll = long long;
#define REP(i, n) for(int i = 0; i < n; ++i)
constexpr ll MOD = 1e9 + 7;
constexpr ll INF = 1LL << 60;
constexpr int MAX = 22;


vector<int> e;
int main() {
	long double a, b;
	cin >> a >> b;
	cout << (long long)floor(a * b) << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:28: error: 'floor' was not declared in this scope
   18 |         cout << (long long)floor(a * b) << endl;
      |                            ^~~~~
Language: Java

import java.util.Scanner;

public class run
{
	public static void main(String[] args)
	{
		Scanner scan = new Scanner(System.in);
		
		double b = scan.nextInt() * scan.nextDouble();
		scan.close();
		System.out.println((int)b);
		
		
	}
}

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'ans' was not declared in this scope; did you mean 'an'?
    8 |         ans=a*b;
      |         ^~~
      |         an
Language: C++

#include <bits/stdc++.h>

#include <boost/multiprecision/cpp_dec_float.hpp>

namespace mp = boost::multiprecision;
using cpp_dec_float = mp::number<mp::cpp_dec_float<500>>;

int main() {
  long long a;
  cpp_dec_float b;
  std::cin >> a >> b
  std::cout << (long long)(a * b) <<  std::endl;
   
}

Compiler output:
a.cc:3:10: fatal error: boost/multiprecision/cpp_dec_float.hpp: No such file or directory
    3 | #include <boost/multiprecision/cpp_dec_float.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long double A,B;
  scanf("%lf %lf", &A,&B);
    
    
    
    printf("%lld", (long long int)(A*B));
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:8: error: 'long long' specified with 'double'
    5 |   long long double A,B;
      |        ^~~~
a.cc:5:8: error: 'long long' specified with 'double'
Language: Java

import java.util.*;
public class Main{
  public static void main(String [] args){
    Scanner sc = new Scanner(System.in);
    long a = sc.nextLong();
    float b = sc.nextFloat();
    long res = (long)a*b;
    System.out.println(res);
  }
}

Compiler output:
Main.java:7: error: incompatible types: possible lossy conversion from float to long
    long res = (long)a*b;
                      ^
1 error
Language: C

#include<stdio.h>

int main(){
  int A,answer;
  double B;
  scanf("%d")
  scanf("%d %lf",&A,&B);
  answer = A * B;
  printf("%d",answer);

return(0);
}

Compiler output:
main.c: In function 'main':
main.c:6:14: error: expected ';' before 'scanf'
    6 |   scanf("%d")
      |              ^
      |              ;
    7 |   scanf("%d %lf",&A,&B);
      |   ~~~~~
Language: C++

#include <iostream>
#include <vector>

typedef long long ll;

int main()
{
	using namespace std;

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

	ll a;
	double b;

	cin >> a >> b;

	const auto res = trunc(a * b);

	cout << res;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:26: error: 'trunc' was not declared in this scope
   19 |         const auto res = trunc(a * b);
      |                          ^~~~~
Language: C++

#include <iostream>
#include <vector>

typedef long long ll;

int main()
{
	using namespace std;

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

	ll a;
	double b;

	cin >> a >> b;

	const auto res = trunc(a * b);

	cout << res;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:26: error: 'trunc' was not declared in this scope
   19 |         const auto res = trunc(a * b);
      |                          ^~~~~
Language: C++

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

long long A;
double B;
int main() {
	cin >> A >> B;
	cout << (long long)floor(B*A) << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:28: error: 'floor' was not declared in this scope
   11 |         cout << (long long)floor(B*A) << endl;
      |                            ^~~~~
Language: C++

#include <iostream>
#include <cmath>
// Boost Multiprecision Library を include
#include <boost/multiprecision/cpp_dec_float.hpp>
using namespace std;
namespace mp = boost::multiprecision;


int main()
{
	int a,b,c,d;
     mp::cpp_dec_float_100 a,b;cin>>a>>b;
  cout<<fixed<<(long long)floor(a*b)<<endl;
}

Compiler output:
a.cc:4:10: fatal error: boost/multiprecision/cpp_dec_float.hpp: No such file or directory
    4 | #include <boost/multiprecision/cpp_dec_float.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++


#include <iostream>
#include <iomanip>

using namespace std;


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

	long long a;
	long double b;
	cin >> a >> b;

	cout << fixed << setprecision(0) << floor(a * b) << '\n';

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:45: error: 'floor' was not declared in this scope
   18 |         cout << fixed << setprecision(0) << floor(a * b) << '\n';
      |                                             ^~~~~
Language: Java

// "static void main" must be defined in a public class.
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long a;
        double b;
        a = sc.nextLong();
        b = sc.nextDouble();
        double ans = a*b;
        long x = (long)ans;
        System.out.println(x);
    }
}

Compiler output:
Main.java:4: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:4: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

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

int main() {
  int A;
  double B;
  cin >> A;
    cin>>B;
  double x;
  x == A*B
  cout << (int)x << endl; // double型の値をint型に変換
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: expected ';' before 'cout'
   10 |   x == A*B
      |           ^
      |           ;
   11 |   cout << (int)x << endl; // double型の値をint型に変換
      |   ~~~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using vl = vector<ll>;
using vvl = vector<vl>;
using vb = vector<bool>;
using P = pair<ll, ll>;
template <typename T> using pq = priority_queue<T>;
template <typename T> using minpq = priority_queue<T, vector<T>, greater<T>>;
template <typename T, typename K> using ump = unordered_map<T, K>;
const ll dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
const ll mod = 1000000007;
const ll inf = ll(1e9);
const ll e5 = ll(1e5);
const ll ll_inf = ll(1e9) * ll(1e9);

#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define repr(i, n) for (ll i = ll(n - 1); i >= 0; i--)
#define each(i, mp) for (auto &i : mp)
#define eb emplace_back
#define F first
#define S second
#define all(obj) (obj).begin(), (obj).end()

template <class T> ostream &operator<<(ostream &out, const vector<T> &list) {
    ll n = list.size();
    rep(i, n) out << list[i] << ' ';
    return out;
}

template <class T> istream &operator>>(istream &in, vector<T> &list) {
    ll n = list.size();
    rep(i, n) in >> list[i];
    return in;
}

template <class T> ostream &operator<<(ostream &out, const vector<vector<T>> &list) {
    ll n = list.size();
    rep(i, n) out << list[i] << '\n';
    return out;
}

/* ------------- ANSWER ------------- */
/* ---------------------------------- */

void solve() {

   long long double a, b;
    cin >> a >> b;
    long long double tmp = a * b;
    cout << ll(tmp) << '\n';
}

int main() {
#ifdef MY_DEBUG
    while (true) {
#endif
        solve();
#ifdef MY_DEBUG
    }
#endif
    return 0;
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:50:9: error: 'long long' specified with 'double'
   50 |    long long double a, b;
      |         ^~~~
a.cc:50:9: error: 'long long' specified with 'double'
a.cc:52:10: error: 'long long' specified with 'double'
   52 |     long long double tmp = a * b;
      |          ^~~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:14: error: 'long long' specified with 'double'
    6 |         long long double b;
      |              ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int a;
  double b,x;
  cin>>a>>b;
  x=a*b;
  int y=(x*100)%100;
  cout<<x-y/100<<endl;}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: error: invalid operands of types 'double' and 'int' to binary 'operator%'
    8 |   int y=(x*100)%100;
      |         ~~~~~~~^~~~
      |           |     |
      |           |     int
      |           double
Language: Java

import java.util.*;
public class Main 
{
	public static void main(String[] args)
    {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
        double b = sc.nextInt();
      long sum = 0;
      sum = (long)a*b;
          
        System.out.println(sum);
	}
}

Compiler output:
Main.java:10: error: incompatible types: possible lossy conversion from double to long
      sum = (long)a*b;
                   ^
1 error
Language: C++

#include <iostream>
#include <cmath>
// Boost Multiprecision Library を include
#include <boost/multiprecision/cpp_dec_float.hpp>
using namespace std;
namespace mp = boost::multiprecision;

int main()
{
     mp::cpp_dec_float_100 a,b;cin>>a>>b;
  cout<<fixed<<(long long)floor(a*b)<<endl;


Compiler output:
a.cc:4:10: fatal error: boost/multiprecision/cpp_dec_float.hpp: No such file or directory
    4 | #include <boost/multiprecision/cpp_dec_float.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

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

int main(){
  int a;
  double b;
  cin>>a>>b;
  int c=a*b
  cout<<c<<endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: expected ',' or ';' before 'cout'
    9 |   cout<<c<<endl;
      |   ^~~~
Language: C++

#include <iostream>
#include <vector>
#include <cstdlib>  
#include <algorithm>
#include <string>
#include <math.h>

using namespace std;
 
int main() {
    double a,b;
    cin>>a>>b;
  　cout<<long(a*b);
    return 0;
}

Compiler output:
a.cc:13:3: error: extended character 　 is not valid in an identifier
   13 |   　cout<<long(a*b);
      |   ^
a.cc: In function 'int main()':
a.cc:13:3: error: '\U00003000cout' was not declared in this scope
   13 |   　cout<<long(a*b);
      |   ^~~~~~
Language: C++

#include<cmath>
#include <bits/stdc++.h>
using ll = long long;
using namespace std;
stack<int> st;
queue<int> qu;
queue<pair<int,int> > qu2;
priority_queue<int> pq;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
#define rep2(i,n) for(int i=1; i<=(int)(n); i++)
#define mins(x,y) x=min(x,y)
#define maxs(x,y) x=max(x,y)
typedef set<int> set_t;
typedef set<string> set_g;
typedef complex<double> xy_t;
static const int NIL = -1;
static const int INF = 1000000007;
#define mp make_pair
#define sz(x) int(x.sise())
#define mod 1000000007
#define reps(i,s,n) for(int i = s; i < n; i++)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
deque<int> deq;
#define fi first
#define se second
//const ll MOD = 998244353;
const ll MOD = (1e+9) + 7;
typedef pair<int, int> P;
int main(){
    ll a;
    double b;
    cin >> a>> b;
    (ll)b*=100;
    ll ans=a*b;
    ans/=100;
    cout<<ans<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:5: error: lvalue required as left operand of assignment
   34 |     (ll)b*=100;
      |     ^~~~~
Language: Java

import java.math.BigDecimal;
import java.util.*;

public class B 
{
    public static void main(String [] args)
    {
        Scanner sc = new Scanner(System.in);
        String s1 = sc.next();
        String s2 = sc.next();
        BigDecimal a = new BigDecimal(s1);
        BigDecimal b = new BigDecimal(s2);
        b = b.multiply(a);
        System.out.println(b.longValue());
    } 
}

Compiler output:
Main.java:4: error: class B is public, should be declared in a file named B.java
public class B 
       ^
1 error
Language: C++


#include <iostream>

using namespace std;


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

	long long a;
	long double b;
	cin >> a >> b;

	cout << floor(a * b) << '\n';

	return 0;
}


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

#include <iostream>
#include <vector>
#include <cstdlib>  
#include <algorithm>
#include <string>
#include <math.h>

using namespace std;
 
int main() {
    double a,b;
    cin>>a>>b;
  　cout<<int(a*b);
    return 0;
}

Compiler output:
a.cc:13:3: error: extended character 　 is not valid in an identifier
   13 |   　cout<<int(a*b);
      |   ^
a.cc: In function 'int main()':
a.cc:13:3: error: '\U00003000cout' was not declared in this scope
   13 |   　cout<<int(a*b);
      |   ^~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
const ll mod = 1000000007;
const ll INF = 9223372036854775807;
#define Sort(a) sort(a.begin(), a.end())
#define Bsort(a) sort(a.begin(), a.end(), greater<ll>())
#define Pi acos(-1)

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  ll a;
  double b;
  cin >> a >> b;
  ll ans = a*b;
  cout << ans << '\n';
}
}

Compiler output:
a.cc:19:1: error: expected declaration before '}' token
   19 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int a;
  double b.x;
  cin>>a>>b;
  x=a*b;
  int y=(x*100)/100;
  cout<<y<<endl;}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:11: error: expected initializer before '.' token
    5 |   double b.x;
      |           ^
a.cc:6:11: error: 'b' was not declared in this scope
    6 |   cin>>a>>b;
      |           ^
a.cc:7:3: error: 'x' was not declared in this scope
    7 |   x=a*b;
      |   ^
Language: C++

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

int main(){
  int a;
  double b;
  cin>>a>>b;
  cout a*b;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:7: error: expected ';' before 'a'
    8 |   cout a*b;
      |       ^~
      |       ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  double a,b;
  scanf("%lf %lf", &a,&b)
    printf("%lld", (int)(a*b));
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:26: error: expected ';' before 'printf'
    6 |   scanf("%lf %lf", &a,&b)
      |                          ^
      |                          ;
    7 |     printf("%lld", (int)(a*b));
      |     ~~~~~~
Language: C

A,B = map(str,input().split(" "))
a = int(A)
b = int(B.split(".")[0])
print(a*b)

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | A,B = map(str,input().split(" "))
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'A' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'B' [-Wimplicit-int]
    1 | A,B = map(str,input().split(" "))
      |   ^
main.c:1:7: error: implicit declaration of function 'map' [-Wimplicit-function-declaration]
    1 | A,B = map(str,input().split(" "))
      |       ^~~
main.c:1:11: error: 'str' undeclared here (not in a function)
    1 | A,B = map(str,input().split(" "))
      |           ^~~
main.c:1:15: error: implicit declaration of function 'input' [-Wimplicit-function-declaration]
    1 | A,B = map(str,input().split(" "))
      |               ^~~~~
main.c:1:22: error: request for member 'split' in something not a structure or union
    1 | A,B = map(str,input().split(" "))
      |                      ^
main.c:2:1: error: expected ',' or ';' before 'a'
    2 | a = int(A)
      | ^
Language: C++

import math
a,b=input().split()
a=int(a)
b=b*100
ans=math.floor(a*b/100)
print(ans)

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import math
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: Java

import java.io.*;
import java.util.Arrays;
import java.util.StringTokenizer;

public class C {

    static class Task {

        public void solve(int testNumber, InputReader in, PrintWriter out) {
            long a = in.nextLong();
            double b = in.nextDouble();
            long b1 = (long) (b * 100);
            out.println(a * b1 / 100);
        }
    }

    private static void sort(double[] arr) {
        Double[] objArr = Arrays.stream(arr).boxed().toArray(Double[]::new);
        Arrays.sort(objArr);
        for (int i = 0; i < arr.length; i++) {
            arr[i] = objArr[i];
        }
    }

    private static void sort(int[] arr) {
        Integer[] objArr = Arrays.stream(arr).boxed().toArray(Integer[]::new);
        Arrays.sort(objArr);
        for (int i = 0; i < arr.length; i++) {
            arr[i] = objArr[i];
        }
    }

    private static void sort(long[] arr) {
        Long[] objArr = Arrays.stream(arr).boxed().toArray(Long[]::new);
        Arrays.sort(objArr);
        for (int i = 0; i < arr.length; i++) {
            arr[i] = objArr[i];
        }
    }

    private static void solve() {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task task = new Task();
        task.solve(1, in, out);
        out.close();
    }

    public static void main(String[] args) {
        new Thread(null, () -> solve(), "1", 1 << 26).start();
    }

    static class InputReader {

        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

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

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

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

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

    }

}

Compiler output:
Main.java:5: error: class C is public, should be declared in a file named C.java
public class C {
       ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
typedef pair<int,int>P;
 
int main() {
  double a,b;
  cin>>a>>b;
  double c=a*b;
 int d=1;
  b/=d;
  for(ll i=a*b;i<a*(b+1);i++){
    if(i>c){
      cout<<i-1<<endl;
      break;
    }
    else if(i==c){
      cout<<i<<endl;
      break;
    }
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:21:4: error: expected '}' at end of input
   21 |   }
      |    ^
a.cc:6:12: note: to match this '{'
    6 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
#define ll long long
using namespace std;
int main() {
    ll double a,b;
    cin>>a>>b;
    ll double c=a*b;
    ll int d=c;
    cout<<d;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:2:17: error: 'long long' specified with 'double'
    2 | #define ll long long
      |                 ^~~~
a.cc:5:5: note: in expansion of macro 'll'
    5 |     ll double a,b;
      |     ^~
a.cc:2:17: error: 'long long' specified with 'double'
    2 | #define ll long long
      |                 ^~~~
a.cc:5:5: note: in expansion of macro 'll'
    5 |     ll double a,b;
      |     ^~
a.cc:2:17: error: 'long long' specified with 'double'
    2 | #define ll long long
      |                 ^~~~
a.cc:7:5: note: in expansion of macro 'll'
    7 |     ll double c=a*b;
      |     ^~
Language: C

#include <stdio.h>

int main(void)
{
    int x;
    double y,z;

    scanf("%d",&x);
    scanf("%lf",&y);
    z=x*y;
    printf("%d",int(z/1));

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:17: error: expected expression before 'int'
   11 |     printf("%d",int(z/1));
      |                 ^~~
Language: C++

#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>

namespace mp = boost::multiprecision;

using namespace std;
constexpr long long int mod = 1000000007, MOD = 998244353;
constexpr double PI = 3.14159265358979323846;

int main() {
	//cout << fixed << setprecision(10);
	mp::cpp_int A;
	 double B;
	cin >> A >> B;
	
	B *= 100;
	 mp::cpp_int C = B;
	cout << (A * C/ 100);
}

Compiler output:
a.cc:2:10: fatal error: boost/multiprecision/cpp_int.hpp: No such file or directory
    2 | #include <boost/multiprecision/cpp_int.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
unsigned long long A;
unsigned double B;

int main() {
  cin >> A >> B;
  cout << (int) A * B << endl;
  return 0;
}

Compiler output:
a.cc:4:1: error: 'unsigned' specified with 'double'
    4 | unsigned double B;
      | ^~~~~~~~
Language: C++

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define INF 1073741824
#define ll long long
#define PI (2*acos(0.0))
#define p1(n) printf("showing %d\n",n)
#define p2(m,n) printf("showing %d %d\n",m,n)
#define fastIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define pll pair<ll,ll>
#define x first
#define y second
#define on(val,pos) val|(1<<pos)
#define off(val,pos) val&(~(1<<pos))
#define check(val,pos) (val&(1<<pos))
#define all(n) n.begin(),n.end()
//first four adjacent,second four corner
//int row[8]={0,-1,0,1,1,-1,-1,1};
//int col[8]={-1,0,1,0,-1,-1,1,1};
using namespace std;
//using namespace __gnu_pbds;
//typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

int main(){
    int i,j,k,n,m,val,t=0,test;
    //freopen("000input.txt","r",stdin);
    double a,b,c;
  cin>>a>>b;
  ll k=floor(a*b);
  cout<<k<<endl;
    //free();   //if pointer array
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:32:6: error: conflicting declaration 'long long int k'
   32 |   ll k=floor(a*b);
      |      ^
a.cc:28:13: note: previous declaration as 'int k'
   28 |     int i,j,k,n,m,val,t=0,test;
      |             ^
Language: Java

import java.math.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long a = scanner.nextLong();
        double b = scanner.nextDouble();
        b *= 100;
        long c = (long) b;
        long res = a * c;
        System.out.println(res / 100);
    }
}


Compiler output:
Main.java:4: error: class Solution is public, should be declared in a file named Solution.java
public class Solution {
       ^
1 error
Language: Java

import java.io.*;
import java.util.*;

public class Atcoder {
    public static void main(String [] args) throws IOException {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        String temp[] = br.readLine().split(" ");
        
        long n = Long.parseLong(temp[0]);
        double y = Double.parseDouble(temp[1]);

        double temp2 = y*(double)(n);



        System.out.println((long)temp2);
       

    }
}

Compiler output:
Main.java:4: error: class Atcoder is public, should be declared in a file named Atcoder.java
public class Atcoder {
       ^
1 error
Language: C++

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

int main() {
  
  int A;
  double B;
  
  cin >> A;
  cin >> B;
  
  cout << ( A * B ) / 10 * 10 endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:30: error: expected ';' before 'endl'
   12 |   cout << ( A * B ) / 10 * 10 endl;
      |                              ^~~~~
      |                              ;
Language: C++

#include<iostream>
using namespace std;

int main(){
  long long double A, B;
  cin >> A >> B;
  cout << (long long int)(A*B) << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:8: error: 'long long' specified with 'double'
    5 |   long long double A, B;
      |        ^~~~
a.cc:5:8: error: 'long long' specified with 'double'
Language: C++

#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>

namespace mp = boost::multiprecision;

using namespace std;
constexpr long long int mod = 1000000007, MOD = 998244353;
constexpr double PI = 3.14159265358979323846;

int main() {
	//cout << fixed << setprecision(10);
	mp::cpp_int A;
	long double B;
	cin >> A >> B;
	
	B *= 100;
	 mp::cpp_int C = B;
	cout << (A * C/ 100);
}

Compiler output:
a.cc:2:10: fatal error: boost/multiprecision/cpp_int.hpp: No such file or directory
    2 | #include <boost/multiprecision/cpp_int.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include <bits/stdc++.h>
using namespace std;
#define fio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define ld long double
#define mp make_pair
#define pii pair<int,int>
#define mod 1000000007
#define rep(i,n) for(int i=0;i<n;i++)
int main()
{
    fio;
    ll a;
    double b;
    cin>>a>>b;
    long long double res=a*b;
    cout<<floor(res)<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:10: error: 'long long' specified with 'double'
   22 |     long long double res=a*b;
      |          ^~~~
Language: C

#include <stdio.h>

int main(void)
{
    int x;
    double y,z;

    scanf("%d %lf",&x,&y);
    z=x*y;
    printf("%d",int(z/1));

    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:17: error: expected expression before 'int'
   10 |     printf("%d",int(z/1));
      |                 ^~~
Language: C

#include<stdio.h>
int main()
{
    int a
    float b
    scanf("%d %f",&a,&b);
    int c = a * b
    printf("%d\n",c);
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:10: error: expected ';' before 'float'
    4 |     int a
      |          ^
      |          ;
    5 |     float b
      |     ~~~~~ 
main.c:6:5: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'scanf'
    6 |     scanf("%d %f",&a,&b);
      |     ^~~~~
main.c:6:20: error: 'a' undeclared (first use in this function)
    6 |     scanf("%d %f",&a,&b);
      |                    ^
main.c:6:20: note: each undeclared identifier is reported only once for each function it appears in
main.c:6:23: error: 'b' undeclared (first use in this function)
    6 |     scanf("%d %f",&a,&b);
      |                       ^
main.c:8:5: error: expected ',' or ';' before 'printf'
    8 |     printf("%d\n",c);
      |     ^~~~~~
Language: C++

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

#define LL long long

#define FOR(INDEX, START, END) for (LL INDEX = (START); INDEX < (END); ++INDEX)
#define REP(INDEX, COUNT) for (LL INDEX = 0; INDEX < (COUNT); ++INDEX)

int main()
{
	LL a;
	double b;
	cin >> a >> b;

	cout << LL(a * b) << endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:4:12: error: expected primary-expression before 'long'
    4 | #define LL long long
      |            ^~~~
a.cc:15:17: note: in expansion of macro 'LL'
   15 |         cout << LL(a * b) << endl;
      |                 ^~
Language: C++

#include<iostream>
#include<math.h>
#include<climits>
#include<vector>
#include<set>
#include<map>
#include<string>
#include<unordered_set>
#include<unordered_map>
#include<utility>
#include<algorithm>
#include<queue>
#include<stack> 
using namespace std;
#define ff              first
#define ss              second
#define int             long long int
#define pb              push_back
#define mp              make_pair
#define pii             pair<int,int>
#define si              set<int>
#define usi             unordered_set<int>
#define umii            unordered_map<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define mod             1000000007
#define inf             1e18
#define sp(x,y)         fixed<<setprecision(y)<<x
#define mk(arr,n,type)  type *arr=new type[n];
#define w(t)            int t; cin>>t; while(t--)
#define asc(i,a,n)      for (int i=a;i<n;i++)
#define dsc(i,a,n)      for (int i=n-1;i>=a;i--)
#define sz(x)           ((int)(x).size())
#define flg             if(flag==0)cout<<"Yes"<<endl;else{cout<<"No"<<endl;}
#define FLG             if(flag==0)cout<<"YES"<<endl;else{cout<<"NO"<<endl;}
#define input(arr,n)    for(int i=0; i<n ; i++) cin>>arr[i];
#define output(arr,n)   for(int i=0; i<n ; i++) cout<<arr[i]<<" ";
#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define endl "\n"



int32_t main()
{

  long double a,b,c;
  cin>>a>>b;


  c=a*b;

 int ans = c;
  

  string an="";


  while(ans)
  {
    char digit = ans%10 +'0';


    ans=ans/10;

    an = digit + an;

  }

  if(an="")
  {
    cout<<0<<endl;
    return 0;
  }

  cout<<an<<endl;







    


    








  


    return 0;
}





Compiler output:
a.cc: In function 'int32_t main()':
a.cc:73:8: error: could not convert 'an.std::__cxx11::basic_string<char>::operator=(((const char*)""))' from 'std::__cxx11::basic_string<char>' to 'bool'
   73 |   if(an="")
      |      ~~^~~
      |        |
      |        std::__cxx11::basic_string<char>
Language: C++

#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>

namespace mp = boost::multiprecision;

using namespace std;
constexpr long long int mod = 1000000007, MOD = 998244353;
constexpr double PI = 3.14159265358979323846;

int main() {
	//cout << fixed << setprecision(10);
	mp A;
	long double B;
	cin >> A >> B;
	
	B *= 100;
	long long C = B;
	cout << (A * C/ 100);
}

Compiler output:
a.cc:2:10: fatal error: boost/multiprecision/cpp_int.hpp: No such file or directory
    2 | #include <boost/multiprecision/cpp_int.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>

using namespace std;

int main(void){

  int A;
  double B;

  cin >> A >> B;

  cout << (int)A*B << endl;

  endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:7: error: statement cannot resolve address of overloaded function
   14 |   endl;
      |       ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
 long long a;
  long double b;
  cout << int floor(a*b) <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: expected primary-expression before 'int'
    6 |   cout << int floor(a*b) <<endl;
      |           ^~~
Language: C++

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

int main(){
  ll a,b;
  cin>>a>>b;
  ll z=floor(a*b);
  cout<<(long long int)z<<endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:3:12: error: 'unsigned' specified with 'double'
    3 | #define ll unsigned double
      |            ^~~~~~~~
a.cc:6:3: note: in expansion of macro 'll'
    6 |   ll a,b;
      |   ^~
a.cc:3:12: error: 'unsigned' specified with 'double'
    3 | #define ll unsigned double
      |            ^~~~~~~~
a.cc:6:3: note: in expansion of macro 'll'
    6 |   ll a,b;
      |   ^~
a.cc:3:12: error: 'unsigned' specified with 'double'
    3 | #define ll unsigned double
      |            ^~~~~~~~
a.cc:8:3: note: in expansion of macro 'll'
    8 |   ll z=floor(a*b);
      |   ^~
Language: C++

#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>

namespace mp = boost::multiprecision;

using namespace std;
constexpr long long int mod = 1000000007, MOD = 998244353;
constexpr double PI = 3.14159265358979323846;

int main() {
	//cout << fixed << setprecision(10);
	mp A;
	long double B;
	cin >> A >> B;
	
	B *= 100;
	long long C = B;
	cout << long long(A * B / 100);
}

Compiler output:
a.cc:2:10: fatal error: boost/multiprecision/cpp_int.hpp: No such file or directory
    2 | #include <boost/multiprecision/cpp_int.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

 #include<bits/stdc++.h>
    using namespace std;
    int main()
    {
     unsigned long long int a;
      float=b;
      cin>>a>>b;
      unsigned long long int x=a*b;
      
      cout<<x<<endl;
        
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:6:12: error: expected unqualified-id before '=' token
    6 |       float=b;
      |            ^
a.cc:7:15: error: 'b' was not declared in this scope
    7 |       cin>>a>>b;
      |               ^
Language: C++

#include<bits/stdc++.h>
#define reg register
typedef long long ll;
using namespace std;
int main(){
	reg ll a;reg double b;
	scanf("%lld%lf",&a,&b);B=b;
	printf("%lld\n",(ll)(a*B));
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
    6 |         reg ll a;reg double b;
      |                ^
a.cc:6:29: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
    6 |         reg ll a;reg double b;
      |                             ^
a.cc:7:32: error: 'B' was not declared in this scope
    7 |         scanf("%lld%lf",&a,&b);B=b;
      |                                ^
Language: Java

Scanner s = new Scanner(System.in);
        final long A = s.nextLong();
        final double B = s.nextDouble();

        BigDecimal bdResult = new BigDecimal(String.valueOf(A * B));

        System.out.println(bdResult.setScale(0, RoundingMode.DOWN));

Compiler output:
Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
Scanner s = new Scanner(System.in);
^
  (use --enable-preview to enable unnamed classes)
Main.java:7: error: class, interface, enum, or record expected
        System.out.println(bdResult.setScale(0, RoundingMode.DOWN));
        ^
2 errors
Language: C++

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

using namespace std;
 
int main() {
  int a, b;
  cin >> a >> b;
  
  int multi = floor(a * b);
  
  cout << multi << endl;
}

Compiler output:
a.cc:2:1: error: 'include' does not name a type
    2 | include <math.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |   cin >> a >> b;
      |   ^~~
      |   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:12:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   12 |   cout << multi << endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:12:20: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   12 |   cout << multi << endl;
      |                    ^~~~
      |                    std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: Java

package com.company;

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

public class multiply2 {
    public static void main(String argps[]) throws IOException{
        process();
    }
    public static void process() throws IOException{
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st=new StringTokenizer(in.readLine());
        double a=Double.parseDouble(st.nextToken());
        double b=Double.parseDouble(st.nextToken());
      	a*=b;
        long res=(long)(a);
        System.out.println(res);
    }
}


Compiler output:
Main.java:8: error: class multiply2 is public, should be declared in a file named multiply2.java
public class multiply2 {
       ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> P;
#define int long long
int INF = 1e9+7;
signed main() {
    long double A,B;
    cin >> A >> B;
    cout << fixed << setprecision(0) << max((A*B-0.499999999),0.0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:44: error: no matching function for call to 'max(long double, double)'
    9 |     cout << fixed << setprecision(0) << max((A*B-0.499999999),0.0) << endl;
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:9:44: note:   deduced conflicting types for parameter 'const _Tp' ('long double' and 'double')
    9 |     cout << fixed << setprecision(0) << max((A*B-0.499999999),0.0) << endl;
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:9:44: note:   mismatched types 'std::initializer_list<_Tp>' and 'long double'
    9 |     cout << fixed << setprecision(0) << max((A*B-0.499999999),0.0) << endl;
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~~~~
Language: C

int main(void)
{
    int x;
    double y,z;
 
    scanf("%d %lf",&x,&y);
    z=x*y;
    printf("%d",int(z/1));
 
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:5: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    6 |     scanf("%d %lf",&x,&y);
      |     ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int main(void)
main.c:6:5: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    6 |     scanf("%d %lf",&x,&y);
      |     ^~~~~
main.c:6:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:8:5: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    8 |     printf("%d",int(z/1));
      |     ^~~~~~
main.c:8:5: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:8:5: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:8:5: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:8:17: error: expected expression before 'int'
    8 |     printf("%d",int(z/1));
      |                 ^~~
Language: C++

#define _GLIBCXX_DEBUG
#include<algorithm>
#include<cmath>
#include<cstring>
#include<cstdio>
#include<iostream>
#include<vector>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<string>
#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)n; i++)
#define rep2(i,s,n) for(int i=s;i< (int)n; i++)
#define ll long long 
#define all(v) v.begin(),v.end()
using namespace std;
int main(){
  double a,b; cin >>a>>b;
  double ans =(a*b*100);
  ll ans2=ans/100;
  cout <<ans2<<endl;
}s<<endl;
}

Compiler output:
a.cc:25:2: error: 's' does not name a type
   25 | }s<<endl;
      |  ^
a.cc:26:1: error: expected declaration before '}' token
   26 | }
      | ^
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define rep(i,n) for(int i=0; i<(n); ++i)
using namespace std;
int main() {
  int A;
  double B;
  cin >> A >> B;
  cout << florr(A*B) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: 'florr' was not declared in this scope; did you mean 'floor'?
    9 |   cout << florr(A*B) << endl;
      |           ^~~~~
      |           floor
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
 long long a;
  long double b;
  cout <<floor(int a*b) <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: expected primary-expression before 'int'
    6 |   cout <<floor(int a*b) <<endl;
      |                ^~~
Language: C++

#include <bits/stdc++.h>


using namespace std;
constexpr long long int mod = 1000000007, MOD = 998244353;
constexpr double PI = 3.14159265358979323846;

int main() {
	//cout << fixed << setprecision(10);
	long long A;
	long double B;
	cin >> A >> B;
	A /= 10;
	B *= 100;
	long long C = B;
	cout << long long(A * B / 10);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:17: error: expected primary-expression before 'long'
   16 |         cout << long long(A * B / 10);
      |                 ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define MOD 1000000007
using Graph = vector<vector<int>>;
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
// 任意長整数型
using Bint = mp::cpp_int;
// 仮数部が1024ビットの浮動小数点数型(TLEしたら小さくする)
using Real = mp::number<mp::cpp_dec_float<1024>>;
int main (){
  Bint a;
  double b;
  cin>>a,b;
  b=b*100;
  Bint c;
  c=b;
  cout<<a*c/100;
}


Compiler output:
a.cc:6:10: fatal error: boost/multiprecision/cpp_dec_float.hpp: No such file or directory
    6 | #include <boost/multiprecision/cpp_dec_float.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
using namespace std;
int main() {
	long long int a;
	double b;
	cin >> a >> b;
	b *= a;
	cout <<fixed<<setprecision(0)<< floor(b);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:41: error: 'floor' was not declared in this scope
   11 |         cout <<fixed<<setprecision(0)<< floor(b);
      |                                         ^~~~~