Objective-C 中 BOOL 类型属性的缺省值是多少？

Question

Objective-C 中 BOOL 类型的属性未初始化，那么它的值是默认YES／NO，还是随机的？

Answer 1

The default is NO.

Answer 2

The default value of basic data types in OC is 0, and the type 0 of BOOL represents NO

Answer 3

The BOOL type is a typedefed char type. When not initialized, it is the same as the C language, which is 0 in ASCII, and the same as 0000 in Unicode

Answer 4

Member variables have default values:

Variables	Default value
Byte	0
short	0
int	0
long	0L
char	/u0000'
float	0.0F
double	0.0D
Boolean	FALSE
All pointer variables	nil (is the null pointer)