5.10-重栽成员函数.cpp

Visual C++的课件

//Listing 10.1 Overloading class member functions
#include <iostream.h>

// Rectangle class declaration
class Rectangle
{
public:
	// constructors
	Rectangle(int width, int height);
	~Rectangle(){}

	// overloaded class function DrawShape
	void DrawShape() const;
	void DrawShape(int aWidth, int aHeight) const;

private:
	int itsWidth;
	int itsHeight;
};

//Constructor implementation
Rectangle::Rectangle(int width, int height)
{
	itsWidth = width;
	itsHeight = height;
}


// Overloaded DrawShape - takes no values
// Draws based on current class member values
void Rectangle::DrawShape() const
{
	DrawShape( itsWidth, itsHeight);
}


// overloaded DrawShape - takes two values
// draws shape based on the parameters
void Rectangle::DrawShape(int width, int height) const
{
	for (int i = 0; i<height; i++)
	{
		for (int j = 0; j< width; j++)
		{
			cout << "*";
		}
	cout << "\n";
	}
}

// Driver program to demonstrate overloaded functions
int main()
{
	// initialize a rectangle to 30,5
	Rectangle theRect(30,5);
	cout << "DrawShape(): \n";
	theRect.DrawShape();
	cout << "\nDrawShape(40,2): \n";
	theRect.DrawShape(40,2);
	return 0;
}