Xcode compiler doesn't set my variable (and pointer) initial value to 0 or nil

this is very annoying, since now my values are stored as if they contain something by default (like in C). All my开发者_如何学JAVA OO stuff are now broken since my delegate are always something. I was wonderin why Xcode do this to me, since by default Xcode always set the variable value to 0 or nil.

So if I do NSArray* anArray; and then NSLog(%@"%@", anArray);

It could crash or log hasard last allocated memory. This is very frustrating.

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C, Objective C, and C++ all initialize global variables to zero/null/Nil. Local variables are not automatically initialized and must be explicitly initialized.

Additionally, a pointer to a NSArray is not an NSArray. Before using that pointer, you should arrange for an NSArray to actually be at the end of it. For instance, make a new one, something more like

    // NSArray* anArray = new NSArray;  // if using a C++ backend
    NSArray* anArray = [[NSArray alloc] init];  // if using an Objective-C backend
    // ...
    NSLog(%@"%@", anArray);

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Objective C behaves much the same as C in this regard, i.e. non-global variables are not initialised by default. Code defensively and always initialise pointer variables explicitly (either to NULL or to a valid address).