#include <iostream.h>

template<class T>
T PassByValue(T a, T b, T c)
{
    a = a - 1; b = b - 1; c = c - 1;
    return a*b*c;
}

template<class T>
T PassByReference(T& a, T& b, T& c)
{
    a = a - 1; b = b - 1; c = c - 1;
    return a*b*c;
}

template<class T>
T PassByConstReference(const T& a, const T& b, const T& c)
{
    a = a - 1; b = b - 1; c = c - 1; // [C++Error] Project2.cpp(21):
                                     // Cannot modify a const object.
    return a*b*c;
}


int main()
{
        int x = 3, y = 4, z = 5;

        cout << "This program compares 3 types of parameter passing " << endl;
        cout << "note the values of actual parameters, x, y, and z, " << endl;
        cout << "before and after function call " << endl;
        cout << endl;

        cout << "$$pass by value$$ " << endl;
        cout << "before function call, x, y, z = ";
        cout << x << " " << y << " " << z << endl;
        cout << "function return value = ";
        cout << PassByValue(x, y, z) << endl;
        cout << "after function call, x, y, z = ";
        cout << x << " " << y << " " << z << endl;

        cout << endl;

        cout << "$$pass by reference$$ " << endl;
        cout << "before function call, x, y, z = ";
        cout << x << " " << y << " " << z << endl;
        cout << "function return value = ";
        cout << PassByReference(x, y, z) << endl;
        cout << "after function call, x, y, z = ";
        cout << x << " " << y << " " << z << endl;

        cout << endl;

        cout << "PLEASE INCLUDE last part of code and RUN AGAIN " << endl;

//        cout << endl;
//        cout << "$$pass by const reference$$ " << endl;
//        cout << "before function call, x, y, z = ";
//        cout << x << " " << y << " " << z << endl;
//        cout << "function return value = ";
//        cout << PassByConstReference(x, y, z) << endl;
//        cout << "after function call, x, y, z = ";
//        cout << x << " " << y << " " << z << endl;

          getchar(); // delete if using MS Visual C++

        return 0;
}