8.29学习总结

#include <iostream>using namespace std;
class Rect
{
private:int width;int height;
public://初始化void init(int w, int h){width=w;height=h;}//修改宽度void set_w(int w){width=w;}//修改高度void set_h(int h){height=h;}//输出周长和面积void show(){cout << "周长：" << 2*width+2*height << endl;cout << "面积：" << width*height << endl;}
};
int main()
{Rect r;r.init(9,9);r.show();cout << "--------------------" << endl;r.set_w(1);r.set_h(1);r.show();return 0;
}