Action
This function performs a byte compare on two variables.
Syntax
result = COMPARE( var1, var2, bytes)
Remarks
result |
A word variable that is assigned with the result of the function. When the 2 variables are equal, the value will be 0. When the 2 variables differ, the index is returned of the position that differs. |
var1 , var2 |
Any kind of variable like a long or string. Constants are not supported. |
Bytes |
The number of bytes to test. The maximum value must fit into a word. (65535). |
See also
NONE
Example
'-------------------------------------------------------------------------
'name : compare.bas
'copyright : (c) 1995-2025, MCS Electronics
'purpose : demonstrates byte COMPARE function, written by MWS
'micro : Mega88
'suited for demo : yes
'commercial addon needed : no
'-------------------------------------------------------------------------
' purpose: byte-wise compare
' arg Val1: first value to compare, type = don't care
' arg Val2: second value to compare, type = don't care
' arg BtComp: count of bytes to compare, can be a constant or a variable
' range is 1 to 65535 bytes
' result: zero if all bytes within range of BtComp are matching
' 1 up to BtComp if there's a miss,
' zero is used for signaling a comlete match, so Config Base has no effect
' 1 is always the first byte of the variable, whatever type of variable it is
'-------------------------------------------------------------------------
$regfile = "m328pdef.dat"
$crystal = 16000000
$hwstack = 40
$swstack = 32
$framesize = 32
Const Testver = 2 ' edit for different tests 0,1 or 2
Dim Mmpos As Word ' dimension word var to hold the result, i.e. mismatch position
Dim btt As Word ' bytes to test
#if Testver = 0
Dim Val_a(8) As Byte ' byte array vs. byte array
Dim Val_b(8) As Byte ' arrays are initialyzed 0
Btt = 8
Val_a(4) = 1 ' test it
#elseif Testver = 1
Dim Val_a As Double ' Double vs. byte array
Dim Val_b(8) As Byte
Btt = 8
Val_b(2) = 1 ' test it
#elseif Testver = 2 ' compare strings
Dim Val_a As String * 16
Dim Val_b As String * 16
Btt = 12
Val_a = "Hello Bascom"
Val_b = "Hello Bascon" ' find the mismatch
#endif
Mmpos = Compare(val_a , Val_b , Btt)
If Mmpos > 0 Then
Print "We have a miss at pos: " ; Mmpos
Else
Print "Match!"
End If
End