Oct 14, 2011

C Program to calculate the Combinations and Permutations.

C Program to calculate the Combination and Permutations. Combination means way of selecting a things or particular item from the group or sets. nCr=n!/r!(n-r)!. Permutations means possible way of rearranging in the group or set in the particular order. Read more about C Programming Language .



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#include <stdio.h>
#include <conio.h>

main()
{
 int n , r, ncr( int , int);
 long npr( int , int);
 long double fact( int);
 printf(" Enter value of n & r \n");
 scanf("%d %d",&n , &r);
 if( n>= r)
 {
  printf( " %dC%d is %d\n", n,r,ncr( n , r));
  printf(" %dP%d  is %ld", n,r,npr( n, r));
 }
 else
 {
  printf("WRONG INPUT?? enter the correct input");
 }
}
long double fact( int p)
{
 long double facts = 1;
 int i;
 for( i = 1; i<= p; i++)
  facts = facts * i;
 return( facts);
}

int ncr ( int n, int r)
{
 return( fact( n) / (fact( r) * fact(n- r) ) ) ;
}

long npr( int n , int r)
{
 return( fact( n) / fact( n- r));
}
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