xHarbour Reference Documentation > Function Reference

IsSpace()

Checks if the first character of a string is a white-space character.

Syntax

IsSpace( <cString> ) --> lIsWhiteSpaceChar

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 white-space character, otherwise .F. (false).

Description

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

Info

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

Example

// The example collects all white-space characters in a string
// and displays their ASCII values.

   PROCEDURE Main
      LOCAL i, aSpace := {}

      FOR i := 0 TO 255
         IF IsSpace( Chr(i) )
            AAdd( aSpace, i )
         ENDIF
      NEXT

      AEval( aSpace, {|n| QOut(n) } )

      // result:
      //   9           <-- Horizontal tab
      //  10           <-- Line feed
      //  11           <-- Vertical tab
      //  12           <-- Form feed
      //  13           <-- Carriage return
      //  32           <-- Space
   RETURN