OOP LearnObjects

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Creating Objects

beginner

2 min read

An object is an instance of a class. Once you define a class, you can create multiple objects from it.

Creating Objects

Car myCar;           // Stack allocation
Car* ptr = new Car(); // Heap allocation

Accessing Members

myCar.brand = "Toyota";
myCar.year = 2024;
myCar.start();

Dot Operator (.)

Used with stack-allocated objects
Accesses members directly

Arrow Operator (->)

Used with pointers to objects
Dereferences and accesses members in one step

Object Size

Size of a class = sum of its member variables
Empty class takes 1 byte (to ensure unique addresses)
Member functions don't add to object size

Multiple objects each have their own copy of member variables but share the same member functions.

Key takeaway: Stack objects are created and destroyed automatically — prefer them over heap allocation.