C program for factorial of number

                               factorial of n ( denoted by n! ) is the product of all positive integers less than or equal  to n. For example ,

                     5! = 5 * 4 * 3 * 2 * 1 = 120
                     4! = 4 * 3 * 2 * 1 = 24
                     3! = 3 * 2 * 1 = 6
                     2! = 2 * 1 = 2
                     1! = 1 = 1

C program to find the factorial without recursion

#include<stdio.h>

void main()
{
       int i,n,fact=1;
       clrscr();
       printf("Enter number to find out factorial:");
       scanf("%d",&n);

       for(i=n;i>=1;i--)
       {
              fact=fact*i;
       }
       printf("\nFactorial of %d is:: %d",n,fact);
       getch();
}

                              Recursion means a function is call by itself. Best example of recursion is factorial. Consider the following example of factorial by using recursion.

C program to finc factorial using recursion

#include<stdio.h>
void main()
{
       int no,ans;
       int factorial(int);
       clrscr();      
       printf("\nEnter no to find out factorial: ");
       scanf("%d",&no);
       ans=factorial(no);
       printf("\nfactorial of  %d  is: %d",no,ans);
       getch();
}
int factorial(int x)
{
       int fact;
       if(x==1)
       {
              return(1);
       }
       else
       {
              fact=x*factorial(x-1);
       }
       return(fact);
}