Answer to Question #198958 in C++ for Hassaan

Question

Write a program that counts the number of objects created and destroyed using constructer and destructor.

Answer 1

#include <iostream>

class TestClass
{
    static int counter_;
    
  public:

    TestClass()
    {
        ++counter_;
    }

    TestClass(const TestClass&)
    {
        ++counter_;
    }
    
    ~TestClass()
    {
        --counter_;
    }

    static int Counter()
    {
        return counter_;
    }
};

int TestClass::counter_ = 0;

int main()
{
    std::cout << "1. Counter value: " << TestClass::Counter() << "\n";

    {
        TestClass obj1;

        std::cout << "2. Counter value: " << TestClass::Counter() << "\n";
    }
    
    std::cout << "3. Counter value: " << TestClass::Counter() << "\n";

    TestClass* ptr1 = new TestClass();

    std::cout << "4. Counter value: " << TestClass::Counter() << "\n";
    
    delete ptr1;

    std::cout << "5. Counter value: " << TestClass::Counter() << "\n";

    {
        TestClass obj1;
        TestClass obj2 = obj1;

        std::cout << "6. Counter value: " << TestClass::Counter() << "\n";
    }
    
    std::cout << "7. Counter value: " << TestClass::Counter() << "\n";

    return 0;
}