C++第四章课后习题4-8

定义一个dog类，包含的age，weight等属性，以及对这些属性的操作方法，实现并测试这个类。

 1 #include <iostream>
 2 using namespace std;
 3 class Dog{
 4     private:
 5         int age,weight;
 6     public:
 7         void setdog(int a,int b)
 8         {
 9             age=a;
10             weight=b;
11         }
12         void show()
13         {
14             cout<<"age is "<<age<<","<<"weight is "<<weight<<"."<<endl;
15         }
16 }; 
17 int main()
18 {
19     Dog D;
20     D.setdog(5,15);
21     D.show();
22 }

设计并测试一个矩形类，其属性为矩形的左下角与右上角两个点的坐标，根据坐标能计算矩形的面积。

 1 #include <iostream>
 2 using namespace std;
 3 class Rectangle{
 4     private:
 5         int top,reight,botoom,left;
 6     public:
 7         Rectangle(int t,int r,int b,int l)
 8         {
 9             top=t;
10             reight=r;
11             botoom=b;
12             left=l;
13         }
14         ~Rectangle(){
15             cout<<"over"<<endl;
16         }
17         int area()
18         {
19             int a=top-botoom;
20             int b=reight-left;
21             return a*b;
22         }
23 };
24 int main()
25 {
26     Rectangle d(100,80,50,20);    
27     cout<<"area is: "<<d.area()<<endl;
28 }