Val

Syntax

Assignment Variable = Val (Array Variable, Modifier)

Overview

Convert a Byte Array or String containing Decimal, Hex, or Binary numeric text into its integer equivalent.

Parameters

Array Variable is a byte array or string containing the alphanumeric digits to convert and terminated by a null (i.e. value 0). Modifier can be Hex, Dec, or Bin. To convert a Hex string, use the Hex modifier, for Binary, use the Bin modifier, for Decimal use the Dec modifier. Assignment Variable is a variable that will contain the converted value. FloatIng point characters and variables cannot be converted, and will be rounded down to the nearest integer value.

Example 1

' Convert a string of hexadecimal characters to an integer
  Device = 24HJ128GP502           ' Select the device to compile for
  Declare Xtal = 16
  Dim String1 as String * 10    ' Create a String
  Dim MyWord as Word             ' Create a variable to hold result
  DelayMs 100                    ' Wait for things to stabilise
  Cls                           ' Clear the LCD
  String1 = "12AF"               ' Load the String with Hex ASCII
  MyWord = Val(String1,Hex)       ' Convert the String into an integer
  Print Hex MyWord               ' Display the integer as Hex

Example 2

' Convert a string of decimal characters to an integer
  Device = 24HJ128GP502           ' Select the device to compile for
  Declare Xtal = 16
  Dim String1 as String * 10    ' Create a String
  Dim MyWord as Word             ' Create a variable to hold result
  DelayMs 100                    ' Wait for things to stabilise
  Cls                           ' Clear the LCD
   String1 = "1234"                ' Load the String with Decimal ASCII
  MyWord = Val(String1,Dec)     ' Convert the String into an integer
  Print Dec MyWord               ' Display the integer as Decimal

Example 3

' Convert a string of binary characters to an integer
  Device = 24HJ128GP502           ' Select the device to compile for
  Declare Xtal = 16
  Dim String1 as String * 17    ' Create a String
  Dim MyWord as Word             ' Create a variable to hold result
  DelayMs 100                    ' Wait for things to stabilise
  Cls                           ' Clear the LCD
  String1 = "1010101010000000"   ' Load the String with Binary ASCII
  MyWord = Val(String1,Bin)       ' Convert the String into an integer
  Print Bin MyWord               ' Display the integer as Binary

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Notes.

The Val command is not recommended inside an expression, as the results are not predictable. However, the Val command can be used within an If-Then, While-Wend, or Repeat-Until construct, but the code produced is not as efficient as using it outside a construct, because the compiler must assume a worst case scenario, and use Dword comparisons.

  Device = 24HJ128GP502               ' Select the device to compile for
  Declare Xtal = 16

  Dim String1 as String * 10         ' Create a String
  DelayMs 100                         ' Wait for things to stabilise
  Cls                                ' Clear the LCD
  String1 = "123"                   ' Load the String with Decimal ASCII
  If Val(String1,Hex) = 123 Then       ' Compare the result
    Print At 1,1,Dec Val (String1,Hex)
  Else
    Print At 1,1,"Not Equal"
  EndIf

See also: Str, Strn, Str$.

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