C++课程设计类作业４

#include <bits/stdc++.h>
using namespace std;
class xiexin
{
public:
    xiexin()
    {
        weight=0;
        grade=0;
        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=100,int g=40)
    {
        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=0;
void display(xiexin obj)
{
    cout<<"weight="<<obj.weight<<",grade="<<obj.grade<<",total="<<xiexin::calculate(obj)<<endl;
}
int main()
{
    xiexin boxl;
    display(boxl);
    xiexin box2(5,10);
    display(box2);
    box2.setvalue(20,18);
    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