Write a C language program to calculate the factorial of an integer number.

#include<stdio.h>
#include<conio.h>
void main()
{

    int num, i, fact=1;
    printf("Enter a number : ");
    scanf("%d",&num);
    for(i=num; i>0; i--)
    {
        fact=fact*i;
    }
    printf("Factorial of %d is: %d",num,fact);
    getch();
}

Input/Output: 

 Enter a number: 5
 FActorial of 5 is: 120