Write a program to evaluate the number of combination n items taken r at a time. it is defined as follows. nCr = n!/r!(n-r)!

   1:  #include<stdio.h>

   2:  #include<conio.h>

   3:   

   4:  long getfact(int n);

   5:  void main()

   6:  {

   7:  int n,r;

   8:  int ncr;

   9:  printf("Enter n and r: ");

  10:  scanf("%d%d",&n,&r);

  11:  ncr=getfact(n)/((getfact(r))*getfact(n-r));

  12:  printf("Combination of %d items taken %d at a time: %d",n,r,ncr);

  13:  getch();

  14:  }

  15:  long getfact(int n)

  16:  {

  17:  int i;

  18:  long fact=1;

  19:  for(i=1;i<=n;i++)

  20:  fact=fact*i;

  21:  return(fact);

  22:  }