Question

C program to find ncr and npr recursive using function

Answer 1

#include <stdio.h>   long factorial(int); long find_ncr(int, int); long find_npr(int, int);   int main() { int n, r; long ncr, npr;   printf("Enter the value of n and r\n"); scanf("%d%d",&n,&r);   ncr = find_ncr(n, r); npr = find_npr(n, r);   printf("%dC%d = %ld\n", n, r, ncr); printf("%dP%d = %ld\n", n, r, npr);   return 0; }   long find_ncr(int n, int r) { long result;   result = factorial(n)/(factorial(r)*factorial(n-r));   return result; }   long find_npr(int n, int r) { long result;   result = factorial(n)/factorial(n-r);   return result; }   long factorial(int n) { int c; long result = 1;   for (c = 1; c <= n; c++) result = result*c;   return result;