Sunday, October 16, 2011

NCR and NPR

#include<stdio.h>
#include<conio.h>
long factorial(int);
long find_ncr(int, int);
long find_npr(int, int);
void main()
{
   int n, r;
   long ncr, npr;
   clrscr();
   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);
   getch();
}
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 );
}

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