C Program to find out factorial of a number

C Program to find out factorial of a number

This is a C program to find out the factorial of a given number. In this example, it takes the number as input to the program, calculates the factorial of the number and prints the result.

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example:

            5! = 1 x 2 x  3 x 4 x 5 = 120

See the source code of the program

/*

            Program to find out factorial of a number

            input   : a number

            output  : factorial

*/

# include <stdio.h>

void main () {

            long int n,factorial, i;

            clrscr();

            printf ("Input\n-----\n\n");

            printf ("Enter a number:");

            scanf ("%ld", &n);

            factorial = 1;

            for (i=1;i<=n;i++)

                        factorial  = factorial  * i;

            printf ("\n\nOutput\n------\n\n");

            printf("Factorial of %ld is %ld", n, factorial);

            printf("\n\nPress any key to continue...");

            getch();

}

Output