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 %dn", 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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