C++ Fundamentals · Classes & OOP · Lesson 22 of 24
Encapsulation with private
Concept
Encapsulation with private
private members can only be accessed inside the class itself, forcing outside code to go through public methods.
By the end of this lesson
- Explain the core idea behind Encapsulation with private.
- 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. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
ExampleRunnable
class Account {
private:
double balance;
public:
void deposit(double amount) { balance += amount; }
};Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Encapsulation with private. 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
Explain why marking balance private prevents it from being changed directly.
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