HelpPC 2.10	Quick Reference Utility	Copyright 1991 David Jurgens
Character Test Macros        int isalnum( int c )    - nonzero if letter or digit        int isalpha( int c )    - nonzero if letter        int isascii( int c )    - nonzero if in range 0-127        int iscntrl( int c )    - nonzero if 0x7F, or 0x00-0x1F        int isdigit( int c )    - nonzero if digit        int isgraph( int c )    - nonzero if printable 0x21-0x7E excl space        int islower( int c )    - nonzero if lowercase        int isprint( int c )    - nonzero if printable 0x20-0x7E        int ispunct( int c )    - nonzero if punct char (iscntrl | isspace)        int isspace( int c )    - nonzero if space,tab, CR, LF, VT or FF        int isupper( int c )    - nonzero if uppercase        int isxdigit( int c )   - nonzero if hexadecimal digit        - prototype in ctype.h
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