LookUp
Source: Positron8 Compiler User Manual, PDF page 406
Syntax
Variable = LookUp Index, [ Constant {, Constant…etc } ]
Overview
Look up the value specified by the index and store it in variable. If the index exceeds the highest index value of the items in the list, then variable remains unchanged.
Parameters
Variable may be a constant, variable, or expression. This is where the retrieved value will be stored. Index may be a constant of variable. This is the item number of the value to be retrieved from the list. Constant(s) may be any 8-bit value (0-255). A maximum of 255 values may be placed between the square brackets, 256 if using an 18F device.
Example
' Create an animation of a spinning line.
Device = 18F26K40
' Select the device to compile for
Declare Xtal = 16 ' Tell the compiler the device will be operating at 16MHz
Dim Index as Byte
Dim Frame as Byte
Cls
' Clear the LCD
Do
For Index = 0 to 3
' Create a loop of 4
Frame = LookUp Index, [ "|\-/" ] ' Table of animation characters
Print At 1, 1, Frame ' Display the character
DelayMs 200
' So we can see the animation
Next
' Close the loop
Loop
' Repeat foreverNotes
index starts at value 0. For example, in the LookUp command below. If the first value (10) is required, then index will be loaded with 0, and 1 for the second value (20) etc.
Var1 = LookUp Index, [10, 20, 30]