Online 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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