Difference between a copy constructor and assignment operator

Assignment Operator:
MyClass* x = new C;
MyClass* y = new C;
x = y; // here x.operator= is called
or see example below when pointers are not used

Copy Constructor
Is called in many instances including:
- Pass by value into a method
- Returning by value from a method

Implemented by
MyClass* x = new MyClass;
MyClass* y = new MyClass (x);

 Example Code:

#include
using namespace std;

class MyClass {
    public:
        MyClass() : value(0) {cout << "default ctr called" << endl;}
        ~MyClass() {cout << "default dtr called" << endl;}

        // Copy Constructor
        MyClass(const MyClass& other) {
            cout << "copy ctr called" << endl;
            value = other.value;
        }
        
        // Assignment Operator
        MyClass& operator= (const MyClass& other) {
            cout << "assignment operator called" << endl;
            value = other.value;
            return *this;
        }
        void setValue(const int& newValue) { value = newValue; }
        int getValue() { return value; }
    private:
        int value;
};

int main () {
    MyClass x;
    MyClass y;
    x.setValue('x');
    y.setValue('y');

    cout << "x is now " << x.getValue() << endl;
    cout << "y is now " << y.getValue() << endl;

    cout << "calling \'x = y\'" << endl;
    x = y; // assignment operator

    cout << "x is now " << x.getValue() << endl;
    cout << "y is now " << y.getValue() << endl;

    cout << "calling 'MyClass z = y'" << endl;
    MyClass z = y; // copy constructor

    cout << "x is now " << x.getValue() << endl;
    cout << "z is now " << z.getValue() << endl;
}

Expected Output:
default ctr called
default ctr called
x is now 120
y is now 121
calling 'x = y'
assignment operator called
x is now 121
y is now 121
calling 'MyClass z = y'
copy ctr called
x is now 121
z is now 121
default dtr called
default dtr called
default dtr called

In summary, if assigning values to an object which already exists, the operator== method is used.

However if assigning values to a new object, the copy constructor is used