使用类定义实现隔离储存计算

1.头文件

#ifndef CLASS_H
#define CLASS_H
#include <iostream>
using namespace std;

class rect
{
private:
    int width;
    int height;
public:
    void init(int width,int height);
    void show();
    void setw(int w);
    void seth(int h);
};

#endif // CLASS_H

2.功能函数

#include "class.h"
void rect::init(int width,int height)
{
    this->width=width;
    this->height=height;
}
void rect::show()
{
    cout << "面积为：" << width*height << endl;
    cout << "周长为：" << 2*(width+height) << endl;
}
void rect::setw(int w)
{
    width=w;
}
void rect::seth(int h)
{
    height = h;
}

3.主函数

#include "class.h"

int main()
{
    rect s1;
    cout << "Hello World!" << endl;
    int a,b;
    cout << "请输入矩形的宽和长：";
    cin >> a >> b;
    s1.init(a,b);
    s1.show();
    cout << "请修改矩形的宽度:" ;
    cin >> a ;
    s1.setw(a);
    cout << "请修改矩形的长度:" ;
    cin >> b;
    s1.seth(b);
    s1.show();
    return 0;
}

实现效果