MiniRobotLanguage (MRL)
IVB. Conditional Statement
If Variable Between
Intention
Conditional Statement.
Test if a specified numeric variable or point-variable is between the two given limits P2 and P3. Let's see an example:
' Here we define the value that is tested
' and the minimum and maximum value
VAR.$$ERT=15.05
VAR.$$MIN=15.06
VAR.$$MAX=16.001
' Here comes the test
IVB.$$ERT|$$MIN|$$MAX
DBP.We're between
ELS.
DBP. We're outside
EIF.
As expected, the result is:
If we change the line:
VAR.$$MIN=15.04
we get the result like this:
Now lets see how it works with point-variables. Imagine you want to make sure that coordinates stay in a specified range. Its always an x and an y - coordinate.
VAP.$$ERT=55,30
VAP.$$MIN=0,0
VAP.$$MAX=45,40
IVB.$$ERT|$$MIN|$$MAX
DBP.We're between
ELS.
DBP. We're outside
EIF.
As the x-value is 55 and therefore exceeds the given range of 45, we're outside this time.
What happens is, that the instruction will test that the x and the y value are in their range that is given with the two range-points.
In case of numeric variables, P2 and P3 can be any numeric variables with about 80 bits of precision.
In case of point-variables, P2 and P3 must be Points also
Syntax
IVB.P1|P2|P3 ELS. … EIF.
Parameter Explanation
P1 - Variable or Point Variable with value(s) to test
P2 - minimum value
P3 - maximum value(s)
IXX.'s can be nested to unlimited Depth, and they can also enclose Sub-Program Calls or FEX. (Enumerations) to unlimited Depth.
Example
'***********************************
' IVB./EVB.-Sample
'***********************************
'------------------------------------------
: §§LLV=0
: §§ULV=1
: §§TVA=.5
IVB.§§TVA,§§LLV,§§ULV
§§ERG=1
ELS.
§§ERG=0
EIF.
MBX.$$ERG
'------------------------------------------
: §§LLV=0
: §§ULV=1
: §§TVA=.5
NVB.§§TVA,§§LLV,§§ULV
§§ERG=0
ELS.
§§ERG=1
EIF.
'------------------------------------------
: §§LLV=-5,-4
: §§ULV=5,6
: §§TVA=0,0
NVB.§§TVA,§§LLV,§§ULV
§§ERG=0
ELS.
§§ERG=1
EIF.
MBX.$$ERG
'------------------------------------------
: §§LLV=-5,-99
: §§ULV=5,0
: §§TVA=0,1
IVB.§§TVA,§§LLV,§§ULV
§§ERG=0
ELS.
§§ERG=1
EIF.
MBX.$$ERG
END.
' Using Point Variables
VAP.$$ERT=55,30
VAP.$$MIN=0,0
VAP.$$MAX=55,10
IVB.$$ERT|$$MIN|$$MAX
DBP.We're between
ELS.
DBP. We're outside
EIF.
ENR.
Remarks
-
Limitations:
-
See also: