类与对象1.1

/*1.请定义一个矩形类(Rectangle),私有数据成员为矩形的长度( len)和宽度(wid),
缺省构造函数置len和wid为0,有参构造函数置len和wid为对应形参的值,
另外还包括求矩形周长、求矩形面积、取矩形长度和宽度、修改矩形长度和宽度为对应形参的值、
输出矩形尺寸等公有成员函数。要求输出矩形尺寸的格式为“length:长度,width:宽度”。
编写主函数对定义的类进行测试。*/

#include<iostream>
using namespace std;

class Rectangle
{
private:
    float len,wid;
public:
    Rectangle();
    Rectangle(float i,float j);
    float area();
    float perimeter();
    ~Rectangle();
    void setlenwid(float a,float b);
    void outlenwid();

};

Rectangle::Rectangle(float i,float j)
{
    len = i; wid = j;
}

Rectangle::Rectangle()
{
    len = 0; wid = 0;
}

Rectangle::~Rectangle()
{

}

void Rectangle::setlenwid(float a,float b)
{
    len = a;
    wid = b;
}

void Rectangle::outlenwid()
{
    cout << "length:" << len << "  " << "width" << wid << endl;
}


float Rectangle::area()
{
    return len * wid;
}

float Rectangle::perimeter()
{
    return 2*(len + wid);
}

int main()
{
   Rectangle A1;
   Rectangle A2(4,5);
   cout << A1.perimeter() << endl;
   cout << A2.perimeter() << endl;
   cout << A1.area() << endl;
   cout << A2.area() << endl;
   A2.outlenwid();
   A2.setlenwid(5,6);
   cout << A2.perimeter() << endl;
   cout << A2.area() << endl;
   A2.outlenwid();
   return 0;
}

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转载自blog.csdn.net/qq_38053395/article/details/79997770
1.1