C++课程设计类作业3

 #include <bits/stdc++.h>
 using namespace std;
 class A
 {
 public:
     A()
     {
         a=b=;
         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(,);
     a1.copy(a2);
     a1.print();
 }