C :

#include<stdio.h>
int main(){
	int t;
	scanf("%d",&t);
	int i,n;
	int k,sum;
	for(i=1;i<=t;i++)
	{
		sum=1;
		scanf("%d",&n);
		for(k=1;k<=n;k++)
		{
			sum=sum*k;
		
		
		}

	
	printf("%d\n",sum);
	
	
	}





}

C++ :

#include<stdio.h>
int main()
{
    int t;
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    scanf("%d",&t);
    while(t--)
    {
        int n,ans=1;
        scanf("%d",&n);
        for(int i=1;i<=n;i++)
            ans*=i;
        printf("%d\n",ans);
    }
}

Java :

import java.util.Scanner;
class Main{
	public static void main(String args[]){
	Scanner reader=new Scanner(System.in);
	int t=reader.nextInt();
	int[] a=new int[t];
	int[] b=new int[t];
	for(int i=0;i<t;i++){
		a[i]=reader.nextInt();
      	int s=1;
		for(int k=0;k<a[i];){
			k=k+1;
			s=s*k;
			}
		b[i]=s;
			}
	for(int i=0;i<t;i++){
		System.out.println(b[i]);
		}
	}
}