---
title: BOOL
framework: objectivec
role: symbol
role_heading: Type Alias
path: objectivec/bool
---

# BOOL

Type to represent a Boolean value.

## Declaration

```occ
typedef bool BOOL;
```

## Discussion

Discussion BOOL is explicitly signed so @encode(BOOL) is c rather than C even if -funsigned-char is used. For values, see Boolean Values. Special Considerations Since the type of BOOL is actually char, it does not behave in the same way as a C _Bool value or a C++ bool value. For example, the conditional in the following code will be false on i386 (and true on PPC): - (BOOL)value {     return 256; } // then if ([self value]) doStuff(); By contrast, the conditional in the following code will be true on all platforms (even where sizeof(bool) == 1): - (bool)value {     return 256; } // then if ([self value]) doStuff();