Factorial Using Recursion

Factorial

#include<stdio.h>

long factorial(int);

main()

{

int num;

long f;

printf("ENTER A NUMBER TO FIND FACTORIAL :");

scanf("%d",&num);

if(num<0)

printf("NEGATIVE NUMBERS ARE NOT ALLOWED");

else

{

f = factorial(num);

printf("%d!=%ld",num,f);

}

return(0);

}

long factorial(int n)

{

if(n==0)

return(1);

else

return(n*factorial(n-1));

}