47ptr_to_object.cpp

#include <iostream>
using namespace std;

class Complex
{
    int real, imaginary;

public:
    getData()
    {
        cout << "z = " << real << " + " << imaginary << "i" << endl;
    }
    setData(int a, int b)
    {
        real = a;
        imaginary = b;
    }
};
int main()
{
    Complex c1;
    Complex *p1 = &c1;

    // Basic way to access class members with object
    c1.setData(1, 4);
    c1.getData();

    // Accessing class members with pointer to the class object
    (*p1).setData(2, 5);
    (*p1).getData();

    // Another syntax for pointer to the class object to access class members using arrow operator '->'
    p1->setData(3, 6);
    p1->getData();

    // Using new operator for creating class pointer / object pointer
    Complex *p2 = new Complex;
    p2->setData(4, 7); // both syntax
    (*p2).getData();   // have same function

    // Creating pointer array using new operator
    Complex *p3 = new Complex[3];
    p3->setData(5, 8);
    p3->getData();

    // Using pointer arithmetic to jump to the next index address of the pointer array
    (p3 + 1)->setData(6, 9);
    (p3 + 1)->getData();

    (*(p3 + 2)).setData(7, 10);
    (*(p3 + 2)).getData();
    return 0;
}