Find nCr using Function

/*
Write a program in C to find nCr using function
*/ 

#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 );
}