C TutorialLesson 12Free preview

C Booleans

This lesson is part of C · All levels

Summary

Boolean represents a true or false value, and in standard C no built-in bool type is provided. In general, the boolean value is represented by int, where 0 means wrong and a nonzero value means true. Since C99 header stdbool.h is available which provides the bool type with the values true and false to make the code easier to read. This type is very often used with the if, loop, and success status returning functions.

Key points

In C, 0 is considered false and non-zero numbers are considered true
The stdbool.h header provides the bool type with the values of true and false (C99)
Comparisons like a == b yield boolean values of 1 or 0.
Used for flags and status returning functions such as isSuccess()

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