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Section 1. Declarations and Initializations

1.1: How do you decide which integer type to use?

A: If you might need large values (tens of thousands), use long. Otherwise, if space is very important, use short. Otherwise, use int.

1.4: What should the 64-bit type on a machine that can support it?

A: C9X specifies long long.

1.7: What's the best way to declare and define global variables?

A: The best arrangement is to place each definition in some relevant .c file, with an external declaration in a header file.

1.11: What does extern mean in a function declaration? A: Nothing, really; the keyword extern is optional here.

1.12: What's the auto keyword good for?

A: Nothing.

1.14: I can't seem to define a linked list node which contains a pointer to itself.

A: Structures in C can certainly contain pointers to themselves; the discussion and example in section 6.5 of K&R make this clear. Problems arise if an attempt is made to define (and use) a typedef in the midst of such a declaration; avoid this.

1.21: How do I declare an array of N pointers to functions returning pointers to functions returning pointers to characters?

A: char *(*(*a[N])())(); Using a chain of typedefs, or the cdecl program, makes these declarations easier.

1.22: How can I declare a function that returns a pointer to a function of its own type?

A: You can't quite do it directly. Use a cast, or wrap a struct around the pointer and return that.

1.25: My compiler is complaining about an invalid redeclaration of a function, but I only define it once.

A: Calling an undeclared function declares it implicitly as returning int.

1.25b: What's the right declaration for main()?

A: See questions 11.12a to 11.15.

1.30: What am I allowed to assume about the initial values of variables which are not explicitly initialized?

A: Uninitialized variables with "static" duration start out as 0, as if the programmer had initialized them. Variables with "automatic" duration, and dynamically-allocated memory, start out containing garbage (with the exception of calloc).

1.31: Why can't I initialize a local array with a string?

A: Perhaps you have a pre-ANSI compiler.

1.31b: What's wrong with "char *p = malloc(10);" ?

A: Function calls are not allowed in initializers for global or static variables.

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