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isalnum()             ctype Macro (ctype.h)             isalnum()




Check if a character is a number or letter

#iinncclluuddee <ccttyyppee.hh>
iinntt iissaallnnuumm(_c) iinntt _c;

isalnum tests  whether the argument _c  is alphanumeric (00-99, AA-ZZ,
or aa-zz).   It returns  a number  other than zero  if _c is  of the
desired type, and  zero if it is not.  isalnum  assumes that _c is
an ASCII character or EOF.

***** Example *****

For an example of how to use this macro, see the entry for ctype.

***** See Also *****

ASCII, ctype







































COHERENT Lexicon                                           Page 1

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