Character Utilities
char ch;isalpha(ch)
Is alphabetic a..z A..Z
isupper(ch)
Is upper case
islower(ch)
Is lower case
isdigit(ch)
Is in the range 0..9
isxdigit(ch)
Is 0..9 or a..f or A..F
isspace(ch)
Is white space character (space/newline/tab)
ispunct(ch)
Is punctuation or symbolic
isalnum(ch)
Is alphanumeric (alphavetic or number)
isprint(ch)
Is printable on the screen (and space)
isgraph(ch)
If the character is printable (not space)
iscntrl(ch)
Is a control character (not printable)
isascii(ch)
Is in the range 0..127
iscsym(ch)
Is a valid character for a C identifier
toupper(ch)
Converts character to upper case
tolower(ch)
Converts character to lower case
toascii(ch)
Converts character to ascii (masks off top bit)
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