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C++ Fundamentals · Classes & OOP · Lesson 21 of 24

Constructors

Concept

Constructors

A constructor is a special method that runs automatically when an object is created, usually to set initial values.

By the end of this lesson
  • Explain the core idea behind Constructors.
  • 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;
    Student(std::string n) { name = n; }
};
Student s("Alex");
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Constructors. 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

Add a constructor to your Course class that sets title on creation.

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Console

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