=====isdigit=====
Syntax:

<code>
    #include <cctype>
    int isdigit( int ch );
</code>
The function isdigit() returns non-zero if its argument is a digit between 0
and 9. Otherwise, zero is returned.

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

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