IsDigitChar( c ) F
checks whether the character c is a digit, i.e., occurs in the string
"0123456789".
IsLowerAlphaChar( c ) F
checks whether the character c is a lowercase alphabet letter, i.e.,
occurs in the string "abcdefghijklmnopqrstuvwxyz".
IsUpperAlphaChar( c ) F
checks whether the character c is an uppercase alphabet letter, i.e.,
occurs in the string "ABCDEFGHIJKLMNOPQRSTUVWXYZ".
IsAlphaChar( c ) F
checks whether the character c is either a lowercase or an uppercase alphabet letter.
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GAP 4 manual