Pass argument to function by value and by reference

example:

#include <iostream>

using namespace std;

void function(int byValue, int& byRef);

int main()
{
    int a = 5;
    int b = 10;
    cout << endl << "before fnction()" << endl;
    cout << "a (byValue) = " << a << endl;
    cout << "b (byRef) = " << b << endl;
    function(a, b);

    cout << endl << "after fnction()" << endl;
    cout << "a (byValue) = " << a << endl;
    cout << "b (byRef) = " << b << endl;
    return 0;
}

void function(int byValue, int& byRef){
    byValue++;
    byRef++;
}