C++学习

代码练习

计算矩形周长与面积

#include <iostream>

using namespace std;
//封装一个矩形类（Rect）
//拥有私有属性:宽度（wide）、高度（hight）
//定义成员函数:初始化函数、更改宽度的函数、更改高度的函数、输出矩形周长和面积的函数
class Rect
{
private:
    int wide;
    int hight;
public:
    void init(int w,int h)
    {
        wide = w;
        hight = h;
    }
    void ch_wide()
    {
        cout << "请输入宽度" << endl;
        cin >> wide ;

    }
    void ch_hight()
    {
        cout << "请输入高度" << endl;
        cin >> hight;
    }
    void show()
    {
        cout << "周长: " << ((wide*2)+hight*2) << endl;
        cout << "面积: " << (wide*hight) <<endl;
    }

};

int main()
{

    Rect rec;
    int w;
    int h;
    cout << "请输入宽度: " << endl;
    cin >> w;
    cout << "请输入高度: " << endl;
    cin >> h;
    rec.init(w,h);

    while(1)
    {
        system("CLS");
        rec.show();
        cout << "按1进行计算矩形周长与面积" << endl;
        cout << "按0退出" << endl;
        int key;
        cout << "请输入选项" << endl;
        cin >> key ;
        switch (key)
        {
            case 0:
        {
            goto END;
        }
            break;
        case 1:
        {
            rec.ch_wide();
            rec.ch_hight();
            rec.show();
        }
            break;
        }

    }
    END:
    cout << "退出成功" << endl;
    return 0;
}

效果演示

思维导图