Program to Find nCr and nPr (Combinations and Permutations)

This is a C++ language program code to find nCr (Combinations) and nPr (Permutations).

Note that the program uses following formulas to find nCr and nPr.

The permutations formula is (P(n,r) = n! / (n - r)!).

The combinations formula is (C(n,r) = n! / r! * (n - r)!).

Here we go! :D

#include <iostream>

using namespace std;

long factorial(int x)

{

    long result = 1;

    for (int c = 1; c <= x; c++)

    {

        result = result * c;

    }

    return result;

}

long find_ncr(int x, int y)

{

    long result;

    result = factorial(x) / (factorial(y)*factorial(x-y));

    return result;

} 

long find_npr(int x,int y)

{

    long result;

    result = factorial(x) / factorial(x-y);

    return result;

}

int main()

{

    int n, r;

    long ncr, npr;

    cout << "================" << endl;

    cout << "Enter the value of N : "; cin >> n;

    cout << "Enter the value of R : "; cin >> r;

    cout << "================" << endl;

    ncr = find_ncr(n,r);

    npr = find_npr(n,r);

    cout << n << "C" << r << " = " << ncr << endl;

    cout << n << "P" << r << " = " << npr << endl;

    return 0;

}

PS: I am using Code::Blocks 16.01
Now, lemme give you my screenshot, so you can see like what I'm typing this code.

And....THIS IS IT!

Horay! We did it! \(^o^)/
And yes! you can modification this code to be something new different.
Thank you! :)

reference: C++ programming