rectangletypeimp.cpp

C++编成数据结构与程序设计方法 D.S.Malk编著

#include <iostream>

#include "rectangleType.h"

using namespace std;

void rectangleType::setDimension(double l, double w)
{
    if (l >= 0)
        length = l;
    else
        length = 0;

    if (w >= 0)
        width = w;
    else
        width = 0;
}

double rectangleType::getLength() const
{
    return length;
}

double rectangleType::getWidth()const
{
    return width;
}

double rectangleType::area() const
{
    return length * width;
}

double rectangleType::perimeter() const
{
    return 2 * (length + width);
}

void rectangleType::print() const
{
    cout << "Length = "  << length
         << "; Width = " << width;
}

rectangleType::rectangleType(double l, double w)
{
    setDimension(l, w);
}

rectangleType::rectangleType()
{
    length = 0;
    width = 0;
}

rectangleType operator+ (const rectangleType& firstRect, 
                         const rectangleType& secondRect)
{
    rectangleType tempRect;

    tempRect.length = firstRect.length + secondRect.length;
    tempRect.width = firstRect.width + secondRect.width;

    return tempRect;
}

rectangleType operator* (const rectangleType& firstRect, 
                         const rectangleType& secondRect)
{
    rectangleType tempRect;

    tempRect.length = firstRect.length * secondRect.length;
    tempRect.width = firstRect.width * secondRect.width;

    return tempRect;
}

bool operator==(const rectangleType& firstRect,
                const rectangleType& secondRect)
{
    return (firstRect.length == secondRect.length && 
            firstRect.width == secondRect.width);
}


bool operator!= (const rectangleType& firstRect,
                 const rectangleType& secondRect)
{
    return (firstRect.length != secondRect.length ||
            firstRect.width != secondRect.width);
}