Besser PHP programmieren: Professionelle by Carsten Möhrke

By Carsten Möhrke

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In general, the distinction means that you’ll use angle brackets to refer to a header file owned by the Cocoa API and quotation marks to refer to a header file that you wrote. If you’re curious as to what an #import directive imports, select it (in Xcode) and choose File → Open Quickly to display the contents of the designated header file. 26 | Chapter 1: Just Enough C The Standard Library You also have at your disposal a large collection of built-in C library files. h file that you can include in order to make those functions available to your code.

Luckily, this is exactly the sort of complicated business that Objective-C is going to take care of for us. So all you really have to know in order to use pointers is what they are and what notation is used to refer to them. Let’s start with a simple declaration. ” Never mind how we know there really is going to be an integer at the address designated by this point; here, I’m concerned only with the notation. It is permitted to place the asterisk in the declaration before the name rather than after the type: int *intPtr; I don’t generally use that second form when declaring a pointer, but it does come in handy when declaring several variables of the same type in a single statement.

An NSString is totally different from a C string; it happens, however, that Objective-C lets you write a literal NSString in a way that looks very like a C string: @"string" Notice the at-sign! This expression is actually a directive to the Objective-C compiler to form an NSString object. A common mistake is forgetting the at-sign, thus causing your expression to be interpreted as a C string, which is a completely different animal. Variable Declaration, Initialization, and Data Types | 7 Because the notation for literal NSStrings is modeled on the notation for C strings, it is worth knowing something about C strings, even though you won’t generally encounter them.

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