Factorial with C Program

We get factorial of a number by getting the product of the numbers from 1 to that number.  Here is the formula:

factorial(n) or n! = n * (n-1) * (n-2) * …… * 1

So the factorial of 4 will be:

4! = 4 * 3 * 2 * 1 =  24

Here is a C program to get the factorial of a number:

#include <stdio.h>

int main()
{
    int num, i, fact = 1;
    printf("Enter a number to know its factorial: ");
    scanf("%d",&num);
    for(i=num;i>0;i--){
        fact = fact * i;
    }
    printf("Factorial of %d! = %d",num,fact);
    return 0;
}