BOOL vs Boolean

Question

What is the difference between BOOLand Booleanin Objective-C?

Does it matter which one is used?

If not, why do they both exist?

thank

Answer 1

There is no functional difference ¹ between the Objective-C data type BOOLand the various variants of Boolean types provided, for example, stdbool.hfor C. However, the idiomatic Objective-C code uses the type BOOL(and the values ​​of YESand NO) for Boolean values.

^{1. There are some differences. For example, BOOLit is really a signed charwhile (on my machine) stdbool.hdefines _Bool_and BOOLhow int.}