74-rectangle1_separate.cpp

#include <iostream>
#include <stdexcept>
#include <string>

class Rectangle
{
public:
    Rectangle();

    Rectangle(double initial_width, double initial_height);

    double get_width();
    double get_height();

    double get_area();

    static Rectangle create_unit_square();

private:
    double width;
    double height;
};

Rectangle::Rectangle() : width{0}, height{0}
{
    std::cout << "Rectangle Default Constructor" << std::endl;
}

Rectangle::Rectangle(double w, double h) : width{w}, height{h}
{
    std::cout << "Rectangle Parameterized Constructor" << std::endl;
    if (w < 0 || h < 0)
    {
        throw std::runtime_error{"Invalid dimensions"};
    }
}

double Rectangle::get_width()
{
    return width;
}
double Rectangle::get_height()
{
    return height;
}

double Rectangle::get_area()
{
    return get_width() * get_height();
}

Rectangle Rectangle::create_unit_square()
{
    Rectangle result{1, 1};
    return result;
}

int main()
{
    Rectangle R{}; //This uses the default constructor

    Rectangle R2{6, 10}; //This uses the parameterized constructor

    std::cout << "R has width " << R.get_width() << std::endl;
    std::cout << "R has height " << R.get_height() << std::endl;
    std::cout << "R has area " << R.get_area() << std::endl;

    std::cout << "R2 has width " << R2.get_width() << std::endl;
    std::cout << "R2 has height " << R2.get_height() << std::endl;
    std::cout << "R2 has area " << R2.get_area() << std::endl;

    return 0;
}