Write a c program to find out factorial of given number using function recursion.

void main()
{
  long num,f;
  clrscr();
  printf("Input a number: ");
  scanf("%ld",&num);
  f=fact(num);
  printf("\nFactorial is %ld",f);
  getch();
}
int fact(long n)
{
   if(n==0)
            return 1;
   else
            return(n*fact(n-1));
}