Len

Syntax

Assignment Variable = Len(Source String)

Overview

Find the length of a String. (not including the null terminator) .

Parameters

Source String can be a String variable, or a Quoted String of Characters. The Source String can also be a Byte, Word, Float or Array variable, in which case the value contained within the variable is used as a pointer to the start of the Source String's address in RAM. A third possibility for Source String is a label name, in which case a null terminated Quoted String of Characters is read from code memory. Assignment Variable is a user defined variable.

Example 1

' Display the length of SourceString
  Device = 24HJ128GP502             ' Select the device to compile for
  Declare Xtal = 16

  Dim SourceString as String * 20   ' Create a String capable of 20 characters
  Dim Length as Byte

  SourceString = "Hello World"      ' Load the source string with characters
  Length = Len(SourceString)        ' Find the length of the String
  Print Dec Length                  ' Display the result, which will be 11

Example 2

' Display the length of a Quoted Character String
  Device = 24HJ128GP502             ' Select the device to compile for
  Declare Xtal = 16

  Dim Length as Byte

  Length = Len("Hello World")      ' Find the length of the String
  Print Dec Length                  ' Display the result, which will be 11

Example 3

' Display the length of SourceString using a pointer to SourceString
  Device = 24HJ128GP502             ' Select the device to compile for
  Declare Xtal = 16

  Dim SourceString as String * 20   ' Create a String capable of 20 characters
  Dim Length as Byte               ' Display the length of SourceString
  Dim SourceString as String * 20   ' Create a String capable of 20 characters
' Create a Word variable to hold the address of SourceString
  Dim StringAddr as Word

  SourceString = "Hello World"      ' Load the source string with characters
  ' Locate the start address of SourceString in RAM
  StringAddr = AddressOf(SourceString)
  Length = Len(StringAddr)          ' Find the length of the String
  Print Dec Length        ' Display the result, which will be 11

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Example 4

' Display the length of a code memory string
  Device = 24HJ128GP502             ' Select the device to compile for
  Declare Xtal = 16

  Dim Length as Byte
'
' Create a null terminated string of characters in code memory
'
  Dim Source as Code = "Hello World", 0

  Length = Len(Source)             ' Find the length of the String
  Print Dec Length                  ' Display the result, which will be 11

See also : Creating and using Strings, Creating and using code memory strings,

Left$, Mid$, Right$, Str$, ToLower, ToUpper, AddressOf .

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