//Written by MA Saleh
#include<stdio.h>
//This is a function for Factorial Number
long long find_factorial(int n)
{
    if (n == 0)
    {
        return 1;
    }
    else
    {
        return (n * find_factorial (n - 1)); //using recursion
    }
}

int main()
{
    int num;
    long long int factorial;

    printf("Enter a number for find factorial: ");
    while(scanf("%d", &num) == 1) //Take a number as input from user
    {
        if(num < 0)
    {
        printf("Negative is not allowed\n");
    }
    else
    {
        factorial = find_factorial(num); //call the function
        printf("%d! = %lld\n", num, factorial); //print the result
    }
    }

    return 0;

    //Copyright@MAS

}

Sample Input: 5, 10


Sample Output: