nCr AND nPr

nCr and nPr

#include < stdio.h >

long factorial(int);
long find_ncr(int, int);
long find_npr(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 );
}