C++課程設計類作業3

#include <bits/stdc++.h>
using namespace std;
class A
{
public:
    A()
    {
        a=b=0;
        cout<<"Default Constructor called.\n";
    }
    A(int i,int j)
    {
        a=i;
        b=j;
        cout<<"Constructor called.\n";
    }
    ~A()
    {
        cout<<"Destructor callled.\n";
    }
    void copy(A &aa);
    void print()
    {
        cout<<a<<","<<b<<endl;
    }
private:
    int a,b;
};
void A::copy(A &aa)
{
    if(this==&aa)
        return;
    *this=aa;
}
int main()
{
    A a1,a2(3,4);
    a1.copy(a2);
    a1.print();
}