xHarbour Reference Documentation > Function Reference

IsXDigit()

Checks if the first character of a string is a hexadecimal digit.

Syntax

IsXDigit( <cString> ) --> lIsHexDigit

Arguments

<cString>

A character string to check for its first character.

Return

The function returns .T. (true) when the leftmost character of a string is a hexadecimal digit, otherwise .F. (false).

Description

The function is used to check if a string begins with a hexadecimal digit. It returns .T. (true) when the first character is a hexadecimal digit, and .F. (false) when it begins with any other character.

Info

See also:	IsAlNum(), IsAlpha(), IsAscii(), IsCntrl(), IsDigit(), IsGraph(), IsLower(), IsPrint(), IsSpace(), IsUpper(), Lower(), Upper()
Category:	Character functions , xHarbour extensions
Source:	rtl\is.c
LIB:	xhb.lib
DLL:	xhbdll.dll

Example

// The example collects all hexadecimal digits in a string
// and displays it.

   PROCEDURE Main
      LOCAL i, cHex := ""

      FOR i := 0 TO 255
         IF IsXDigit( Chr(i) )
            cHex += Chr(i)
         ENDIF
      NEXT

      ? cHex      // result:  0123456789ABCDEFabcdef
   RETURN