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Besides Integer, GNU Pascal supports a large zoo of integer types. Some of them you will find in other compilers, too, but most are GNU Pascal extensions, introduced for particular needs. Many of these types are synonyms for each other. In total, GPC provides 20 built-in integer types, plus seven families you can play with. (Four of these “families” are signed and unsigned, packed and unpacked subrange types; the others are explained below.)
See also: Subrange Types.