program to calculate the factorial of the number by recursion in c-language.| c-programming

 program to calculate the factorial of the number by recursion in c-language. 

In this program, we will learn to find the factorial of the natural number by using  recursion and user entered the value.
we will use a recursive user defined function to perform the task .
The factorial of a negative number doesn't exit .
The factorial of 0 is 1.
recursion mean function calling itself . 

#include<stdio.h>
#include<conio.h>
int factorial(int num);
void main()
{
   int n,f=0;
   printf("enter the number");
   scanf("%d",&n);
   f=factorial(n);
   printf("the factorial of the number is %d",f);
   getch();
}
int factorial(int num)
{
   if(num>0)
         return(num*factorial(num-1));
   else
         return(1);
}

output

  enter the number :  5

   factorial of 5 is 120

For more c-programming example:

1.c-program to calculate the GCD of two number by recusion

2.c-program to display fibonacci series by using recusion

3.c-program to calculate the sum of the number by using recursion