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C++ Fundamentals · Classes & OOP · Lesson 20 of 24

Defining a Class

Concept

Defining a Class

A class bundles data, called members, and behavior, called methods, together into a single reusable blueprint for objects.

By the end of this lesson
  • Explain the core idea behind Defining a Class.
  • Predict output before running a change.
  • Test one realistic and one unusual input.
  • Use the result to make the next decision.
How to study this page
  1. 1. Read one concept.
  2. 2. Change the example.
  3. 3. Run, compare, and explain.
  4. 4. Complete the challenge below.
ExampleRunnable
class Student {
public:
    std::string name;
    int age;
};
Student s;
s.name = "Alex";
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Defining a Class. Then reopen the editor and prove your explanation with a small test.

You are ready to continue when you can predict, test, and explain the result.

Your turn

Define a Course class with title and level members.

Loading editor…

Console

Output will appear here...