Found a strange issue. Default value of BOOL is returning TRUE for iOS 10 [closed]

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It’s not a default value as you might think. The reason is that local variables are not initialized unlike instance variables (by default objects are nil, integers are 0, etc).

When you define a local variable, it contains garbage. It means that you can’t use a local variable until you initialize it with some value. 

- (void) someMethod {
    Bool b; //garbage YES or NO
    NSInteger i; //garbage like 113242151235
    NSString *s; //garbage pointer
}

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