isalnum [C++ Reference]
Keywords: c,string,isalnum
Date: 2009-03-22T17:18:47-0700

## isalnum

Syntax:

        #include <cctype>
        int isalnum( int ch );

The function isalnum() returns non-zero if its argument is a numeric digit or a letter of the alphabet. Otherwise, zero is returned.

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

Related Topics: isalpha, iscntrl, isdigit, isgraph, isprint, ispunct, isspace, isxdigit,…