第三次

4-11

#include <iostream.h>

using namespace std；

class Rectangle

｛

public:

Rectangle(float length, float width)

｛

Length = length;

Width = width;

｝

double area（）；

private:

float Length；

float Width;

｝；

double Rectangle：：area（）

｛

return Length*Width；

｝

void main()

｛

float length, width;

cout << "请输入矩形的长度:";

cin >> length;

cout << "请输入矩形的宽度:";

cin >> width;

Rectangle r(length, width);

cout << "长为 " << length << "宽为 " << width << "的矩形 的面积为:"

<< r.GetArea () << endl;

｝

 

 

4-20

#include<iostream>

using namespace std;

class complex{

    public:

      complex(double a,double b);

      void add(complex c2);

      void show();

    private:

      double real,imaginary;    

};

complex::complex(double a,double b){

    real=a;

    imaginary=b;

}

void complex::add(complex c2){

    real+=c2.real;

    imaginary+=c2.imaginary;

}

void complex::show(){

    cout<<real<<"+";

    cout<<imaginary<<"i"<<endl;

}

int main()

{

    complex c1(3,5);

    complex c2(4.5);

    c1.add(c2);

    c1.show();

    return 0;

}

 

这次实验学习了类，通过构造函数、复制构造函数、析构函数来应用类。我对类的使用还不熟练，勉强看懂例题，按例题解题，还不能熟练应用。