Question

C++.阅读程序，写出运行结果,求大神学霸

#include
<iostream.h>

class
A

{ private:

int X,Y;

public:

A( ) { X=Y=0;

cout<<"Default
Constructor called."<<endl;

}

A(int xx,int yy) {

X=xx;Y=yy;

cout<< "Constructor
called."<<endl;

}

~A( ) { cout<<"Destructor called."<<endl; }

};

void
main()

{

A
*p1=new A;

delete p1;

p1=new
A(1,2);

delete
p1;

}

Answer 1

A*p1 = new A;因为没有传参数，调用的是无参的构造函数：
1. Default Constructor Called
delete p1; 调用析构函数
2. Destructor Called
p1 = new A(1,2)//调用含参的构造函数
3. Constructor Called
delete p1//析构
4. Destructor Called

输出就是1,2，3,4后面的了