C++课程设计类作业４

 #include <bits/stdc++.h>
 using namespace std;
 class xiexin
 {
 public:
     xiexin()
     {
         weight=;
         grade=;
         cout<<"weight="<<weight<<",grade="<<grade<<endl;
     }
     xiexin(int w,int g)
     {
         weight=w;
         grade=g;
         cout<<"weight="<<weight<<",grade="<<grade<<endl;
     }
     ~xiexin()
     {
         cout<<"Destructor......\n";
     }
     void setvalue(int w=,int g=)
     {
         weight=w;
         grade=g;
         cout<<"weight="<<weight<<",grade="<<grade<<endl;
     }
     static int calculate(xiexin obj)
     {
         return obj.weight*obj.grade;
     }
     friend void display(xiexin obj);
 private:
     int weight;
     int grade;
     static int cnt;
 };
 int xiexin::cnt=;
 void display(xiexin obj)
 {
     cout<<"weight="<<obj.weight<<",grade="<<obj.grade<<",total="<<xiexin::calculate(obj)<<endl;
 }
 int main()
 {
     xiexin boxl;
     display(boxl);
     xiexin box2(,);
     display(box2);
     box2.setvalue(,);
     display(box2);
 }

如果函数中有多条语句的话，会先执行完这些语句，直到函数结束再析构