KTLT/Lab_9/Bai_1/main.cpp

#include <iostream>
#include <iomanip>

using namespace std;

class A
{
private:
//protected:
    int m_value;
public:
    /*
    A(): m_value(123)
    {
        cout << "In A(), value = " << m_value << endl;
    }
    */
    A()
    {
        this->m_value = 123;
        cout << "In A(), value = " << m_value << endl;
    }
    ///*
    A(const A& ob): m_value(ob.m_value)
    {
        cout << "In A(const A& ob), value = " << m_value << endl;
    }
    //*/
    A(int value): m_value(value)
    {
        cout << "In A(int value), value = " << m_value << endl;
    }
    ///*
    ~A()
    {
        cout << "In ~A(), value = " << m_value << endl;
    }
    //*/
};

int main()
{
    A ob1;
    A *ptr1 = new A(246);
    {
        A ob2(456);
        A ob3(ob1);
    }
    delete ptr1;
    A ob4(789);
    A ob5 = 257;
    return 0;
};