=====isalnum=====
Syntax:

<code>
    #include <cctype>
    int isalnum( int ch );
</code>
The function isalnum() returns non-zero if its argument is a numeric digit or a
letter of the alphabet. Otherwise, zero is returned.

<code>
     char c;
     scanf( "%c", &c );
     if( isalnum(c) )
       printf( "You entered the alphanumeric character %c\n", c );
</code>

Related Topics: [[isalpha]], [[iscntrl]], [[isdigit]], [[isgraph]], [[isprint]], [[ispunct]], [[isspace]], [[isxdigit]],...