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Defining Types
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   The examples so far have described types as references to previously
defined types, or defined in terms of subranges of or pointers to
previously defined types.  This chapter describes the other type
descriptors that may follow the `=' in a type definition.

Builtin Types

Integers, floating point, void, etc.

Miscellaneous Types

Pointers, sets, files, etc.

Cross-References

Referring to a type not yet defined.

Subranges

A type with a specific range.

Arrays

An aggregate type of same-typed elements.

Strings

Like an array but also has a length.

Enumerations

Like an integer but the values have names.

Structures

An aggregate type of different-typed elements.

Typedefs

Giving a type a name.

Unions

Different types sharing storage.

Function Types