*C++

#include<iostream>

using namespace std;

int main(){

int n,t=1;

cin>>n;

for(int i=1;i<=n;i++){

t*=i;

}

cout<<t;

*Python:

n=int(input())
t=1
for i in range(1,n+1):
    t*=i
print(t)

Python:

from math import factorial
print('n! =',factorial(int(input('nhap n: '))))

C++:

#include <bits/stdc++.h>
using namespace std;
int main(){
    long n;
    cin >> n;
    long s=1;
    for (long i=1; i<=n; i++){
        s*=i;
    }
    cout << "n! = " << s;
}

Java:

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner stdin = new Scanner(System.in);
        long n = stdin.nextLong();
        long s=1;
        for (long i=1; i<=n; i++){
            s*=i;
        }
        System.out.println("n! = "+s);
        stdin.close();
    }
}

$\color{green}{\text{**Nếu cần code C# hay JavaScript thì nói để mình bổ sung}}$

$\color{red}{\text{#Daoanhviet96}}$