C Program to Calculate the value of nPr

/*
 * C program to Calculate the Value of nPr
 */
#include <stdio.h>
 
void main(void)
{
   printf("%d\n", fact(8));
   int n, r;
   printf("Enter value for n and r\n");
   scanf("%d%d", &n, &r);
   int npr = fact(n) / fact(n - r);
   printf("\n Permutation values is = %d", npr);
}
 
int fact(int x)
{
   if (x <= 1)
       return 1;
   return x * fact(x - 1);
}

 
Output:

40320
Enter value for n and r
5 4
 
Permutation values is = 120