3-4 计算长方形的周长和面积

柔情只为你懂 2022-06-06 22:39 196阅读 0赞

3-4 计算长方形的周长和面积  
Time Limit: 1000MS Memory Limit: 65536KB  
Submit Statistic  
Problem Description

通过本题的练习可以掌握拷贝构造函数的定义和使用方法；  
设计一个长方形类Rect，计算长方形的周长与面积。类中有私有数据成员Length(长)、Width(宽)，由具有缺省参数值的构造函数对其初始化，函数原型为：Rect(double Length=0, double Width=0); 再为其定义拷贝构造函数，形参为对象的常引用，函数原型为：Rect(const Rect &); 编写主函数，创建Rect对象r1初始化为长、宽数据，利用r1初始化另一个Rect对象r2，分别输出对象的长和宽、周长和面积。

要求： 创建对象 Rect r1(3.0,2.0),r2(r1);  
Input

输入两个实数，中间用一个空格间隔；代表长方形的长和宽  
Output

共有6行 ；  
分别输出r1的长和宽； r1的周长； r1的面积；r2的长和宽； r2的周长； r2的面积；注意单词与单词之间用一个空格间隔  
Example Input

56 32  
Example Output

the length and width of r1 is:56,32  
the perimeter of r1 is:176  
the area of r1 is:1792  
the length and width of r2 is:56,32  
the perimeter of r2 is:176  
the area of r2 is:1792  
Hint

输入 -7.0 -8.0  
输出  
the length and width of r1 is:0,0  
the perimeter of r1 is:0  
the area of r1 is:0  
the length and width of r2 is:0,0  
the perimeter of r2 is:0  
the area of r2 is:0  
Author

#include <iostream>
    
    using namespace std;
    
    class Rect
    {
    public:
        Rect(double Width,double Length);
        Rect(const Rect& rect);
        double getS();
        double getC();
        double getWidth() const;
        double getLength() const;
    private:
        double Width,Length;
    };
    double Rect::getWidth() const
    {
        return this->Width;
    }
    double Rect::getLength() const
    {
        return this->Length;
    }
    Rect::Rect(double Width = 0,double Length = 0)
    {
        if(Width<=0|| Length<=0)
        {
            this->Width = 0;
            this->Length = 0;
            return ;
        }
        this->Width = Width;
        this->Length = Length;
    }
    
    Rect::Rect(const Rect &rect)
    {
        double Width = rect.getWidth();
        double Length = rect.getLength();
        if(Width<=0|| Length<=0)
        {
            this->Width = 0;
            this->Length = 0;
            return ;
        }
        this->Width = Width;
        this->Length = Length;
    }
    
    double Rect::getS()
    {
        return this->getWidth()*this->getLength();
    }
    
    double Rect::getC()
    {
        return 2*(this->getLength()+this->getWidth());
    }
    
    int main()
    {
        double Width,Length;
        cin>>Length>>Width;
        Rect r1(Width,Length);
        cout<<"the length and width of r1 is:"<<r1.getLength()<<","<<r1.getWidth()<<endl;
        cout<<"the perimeter of r1 is:"<<r1.getC()<<endl;
        cout<<"the area of r1 is:"<<r1.getS()<<endl;
        Rect r2(r1);
        cout<<"the length and width of r2 is:"<<r2.getLength()<<","<<r2.getWidth()<<endl;
        cout<<"the perimeter of r2 is:"<<r2.getC()<<endl;
        cout<<"the area of r2 is:"<<r2.getS()<<endl;
        return 0;
    }