WARNING! Be careful with "select case"

[zenac]

Consider the following code...


x=3
y=10

select case x

case 1:
y=100
exit case

case 2:
y=300
exit case

case 4:
y=400
exit case

case 5:
y=500
exit case

end select

print "y=";y


See there is NO treatment for the value "3" inside the variable "x".

Executing the code above, the output should be "y=10".

But the execution of this code brings a strange output: "y=300" (the answer if "x" was 2).

The next code contains a solution for this problem:


x=3
y=10

select case x

case 1:
y=100
exit case

case 2:
y=300
exit case

' INSERT THE TWO LINES BELOW
case 3:
exit case

case 4:
y=400
exit case

case 5:
y=500
exit case

end select

print "y=";y


Now we have the right output: "y=10"

[Deleted]

I believe this is in the BEX documentation, but that works as expected for BEX. Maybe it should be noted somewhere.

The reason for this is because of how select case translates into ASM. Rather than checking for each value in between cases, it works on a range, and if the number falls below the next value, it goes to the previous value.

[tiberiyltim]

Case from 0 up to X.

[landeel]

Case works this way in BEX so it can be really fast. It took me some time to figure it out also. But the select case examples included in the compiler explain it well.