Boolean Values

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~4 min lesson13 learning blocks1 code examples1 checks/interactions

Lesson outline

Introduction to Booleans

The bool type in C++ can hold only two values: true or false.

Booleans are widely used in conditions that control program flow, such as conditional statements and loops.

Example of declaring and printing boolean variables:

Important properties of the bool type in C++:

Property	Description
Size	Implementation-defined; at least 1 byte (most platforms use 1 byte)
true value	Integer → bool: any non-zero becomes true. Bool → integer: true converts to 1.
false value	Integer → bool: 0 becomes false. Bool → integer: false converts to 0.
Default value	Locals with automatic storage are uninitialized (indeterminate) until assigned; static/global booleans are zero-initialized to false.

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