Program to calculate the factorial of a number.

#include<stdio.h>

#include<conio.h>

void main()

{

                int n,i=1,fact=1;

                clrscr();

                printf("\n Enter  a number ");

                scanf("%d",&n);

                while(i<=n)

                {

                                fact=fact * i;

                                i++;

                 }

                 printf("\n Factorial of  %d = %d",n,fact);

                 getch();

}

NOTE :=  Factorial of a number can be calculated  as

                  5! = 5 * 4 * 3 * 2 * 1 = 120.