#include <ctype.h>int isalnum(int ch);

The isalnum( ) function returns nonzero if its argument is either a letter of the alphabet or a digit. If the character is not alphanumeric, zero is returned.

Related functions are isalpha( ), iscntrl( ), isdigit( ), isgraph( ), isprint( ), ispunct( ), and isspace( ).

C(s)C++ Programmer's Reference
C Programming on the IBM PC (C Programmers Reference Guide Series)
ISBN: 0673462897
EAN: 2147483647
Year: 2002
Pages: 539 © 2008-2017.
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