Combinations recursive

// Combinations
#include <iostream>
#include <string>

using namespace std;

int nCR(int n, int r){
    if (r == 0 || r == n){
        return 1; //terminate
    }
    else{
        return nCR(n-1, r-1) + nCR(n-1, r); //recursive calls
    }
}

int main()
{
    int res = nCR(3,2);
 cout << res << endl;
}