C++,类的对象 (栈上的和堆上的),语法练习

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#include <iostream>#include <string>using namespace std;// 定义一个类 Studentclass Student{private:string name;int    age;string address;public:// 存void setname(string s){name = s;}void setage(int y){age = y;}void setaddress(string add){address = add;}    // 取string getname(){return name;}int getage(){return age;}string getaddress(){return address;}protected:};//--- main -------------int main(void){ Student x; // x在栈上,快,容量小,自动释放,自动清理  x.setname("柳絮飘"); x.setage(22); x.setaddress("学明路115号");      cout<<"sizeof(x) = "<<sizeof(x)<<endl;  //36 字节 cout<<"姓名: "<<x.getname()<<"              年龄: "<<x.getage()<<"           住址: "<<x.getaddress()<<endl;     cout<<endl<<endl<<endl;  Student *p = NULL; p = new Student();  // p 在堆上申请的空间   无名对象  p->setname("王志民"); p->setage(21); p->setaddress("建设路22号"); cout<<"sizeof(p) = "<<sizeof(p)<<endl;  //4字节  cout<<"姓名: "<<p->getname()<<"              年龄: "<<p->getage()<<"           住址: "<<p->getaddress()<<endl;            cout<<endl<<endl<<endl; Student *s = NULL; s = &x;            // s 指向栈里的对象 x  cout<<"sizeof(s) = "<<sizeof(s)<<endl;  //4字节  cout<<"姓名: "<<s->getname()<<"              年龄: "<<s->getage()<<"           住址: "<<s->getaddress()<<endl; // --------------------return 0;}