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[TerryRitchie]

Perhaps a command can be added for library writers to test for this?

CheckBase% = _OPTIONBASE

Returns 1 if OPTION BASE 1
Returns 0 if OPTION BASE 0
Returns -1 if OPTION BASE was not set

I was just playing around with OPTION BASE and arrays and I think I may have found a solution for library writers.

If I do this:

OPTION BASE 1
DIM a(100)
a(0) = 10

I get an error.

However, if I do this:

OPTION BASE 1
DIM a(-1 to 100)
a(0) = 10

all is well. As long as the first number in an array is a negative value it seems to allow the use of index 0 and 1 no matter what OPTION BASE is set to. So for arrays in libraries always start them at -1 and any setting by the programmer using OPTION BASE seems to be ignored.

Is this normal behavior or a loophole that I've found?