Write a program to print the factorial of a number.

As we know that factorial of a number means the sum of number less then given number but always greater and equal to 1.

Mathematically let’s take a number b then.

Let’s go through program

#include<stdio.h>

void main ()

{

Int a, fact. =1;

Clrscr();

Printf (“\n enter a number you want to calculate=”);

Scanf (“%d”, & a);

while (a! =0)

{
fact. = fact. * a;

a--;

}

Printf (“\n fact. Of number = %d”, fact.);

getch();

}

DRY RUN: -

Enter a number you want to calculate = 3 (say)

a! =3 so,

fact. = 1* 3;

a= 3-1 =2;

a! =2 so,

fact. = 3*2;

a= 2-1=1;

a! =1 so,

fact. = 6*1;

a= 1-1=0;

a! =0 which is not possible so operation will stop here and output will be 6.