Help with an if / elseif

Hello.

Just wondering why my nested "if" sub ( o100 ) is not working. I want to stop a larger subroutine ( o<tool_length_probe> ) if the user has forgotten to put in a variable value i.e. left a zero.

When I test, it doesn't operate, but rather just skips over the sub and continues running on its merry way...

o100 if [#10 EQ 0]
elseif [#11 EQ 0]
elseif [#12 EQ 0]
elseif [#13 EQ 0]
elseif [#14 EQ 0]
elseif [#15 EQ 0]
elseif [#16 EQ 0]
elseif [#17 EQ 0]
elseif [#18 EQ 0]
(MSG, SOME PARAMETERS IN MACRO FILE NOT SET)
o<tool_length_probe> endsub
M2
o100 endif

Many thanks.

This untested idea with many 'OR' in one line and 'abort'

After some more reading I think it might need:
1. The sub number with each elseif and
2. The action to be taken with each elseif I.e. repeat

(MSG, SOME PARAMETERS IN MACRO FILE NOT SET)
o<tool_length_probe> endsub
M2

after each elseif so the interpreter knows what to do if any single elseif tests true...

Regarding the above, I'm interested to see whether an or statement works

The OR statement did work in this context.

Thanks!