5.24 Other routines
#include <ctype.h>
Kernighan p161, p249. Hanly & Koffman pages 458 & AP6.
isalnum()
True if alphanumeric
isalpha()
True if A-Z or a-z
iscntrl()
Control character
isdigit()
True if 0-9
isgraph()
Printing character except space
islower()
True if a-z
isprint()
Printing character including space
ispunct()
Printing character except space, letter or digit
isspace()
True if space, FF, HT, VT, CR
isupper()
True if A-Z
isxdigit()
True if a Hexadecimal Digit
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