单选题

#include<iostream> using namesp...

Question

#include<iostream>
using namespace std
class MyClass
{
public:
    MyClass(int i = 0)
    {
        cout << i
    }
    MyClass(const MyClass &x)
    {
        cout << 2
    }
    MyClass &operator=(const MyClass &x)
    {
        cout << 3
        return *this
    }
    ~MyClass()
    {
        cout << 4
    }
}
int main()
{
    MyClass obj1(1), obj2(2)
    MyClass obj3=obj1
    obj2=obj1
    return 0
}

运行时的输出结果是：

A. 1233444

B. 1223444

C. 12033444

D. 1222444