C++ Classes & Objects — Free C/C++ Tutorial

TL;DR: Learn C++ Classes & Objects in C/C++ with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

C++ Classes & Objects in C/C++

C++ adds classes — a blueprint that bundles data (member variables) with the functions that operate on it (member functions / methods). This is Object-Oriented Programming (OOP): you model the problem as interacting objects. `class BankAccount { ... };` defines a type; `BankAccount a;` creates an object of it.

Access specifiers control encapsulation: members under private: are hidden from outside code (the default for class), members under public: form the interface. You keep data private and expose safe methods, so an object can never be put into an invalid state from outside.

A constructor is a special method with the class's name and no return type; it runs automatically when an object is created and initialises its members. This guarantees every object starts valid — a big improvement over C structs.

class Name {
private:
    int data;
public:
    Name(int d) { data = d; }
    int get() { return data; }
};

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