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TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6100

Posted: 07:21am 19 Aug 2023

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'
ON ERROR SKIP 1
x = k/0
y = g/0
z = g/0

As expected, the first divide by zero is skipped and the second line throws an error.

'
ON ERROR SKIP 1
x = k/0 : y = g/0
z = g/0

Only the first statement on the line is counted when 'skipping'
The second statement after the : will cause an error condition.

'
t$ = "999"
ON ERROR SKIP 1
x = VAL(t$)/0
y = g/0
z = g/0

With builtin functions, the whole statement is treated as one.
The first error trapped is on the following line
(This may not be true for all built-in functions or complex lines.)

'
t$ = "999"
ON ERROR SKIP 1
x = myval(t$)/0
y = g/0
z = g/0

FUNCTION myval(txt$)
myval = VAL(txt$)
END FUNCTION

With user functions, the call to the function is (more than) one statement hence the error on that line. The example uses up 3 'skip' statements on the one line.
Edited 2023-08-19 17:22 by TassyJim

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CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2076

Posted: 08:55am 19 Aug 2023

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nice concise write-up.

note also that

ON ERROR SKIP 1 ' CATCH ZERO DIVIDE
X=1/0

won't work as you might expect - I think this is probably because ' is treated as REM whic is a statement and so the only 1 command skipped

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6798

Posted: 09:10am 19 Aug 2023

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Also, ON ERROR SKIP is the same as ON ERROR SKIP 1 as the skip count value is optional and defaults to 1.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6100

Posted: 09:52am 19 Aug 2023

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CaptainBoing said nice concise write-up.

note also that

ON ERROR SKIP 1 ' CATCH ZERO DIVIDE
X=1/0

won't work as you might expect - I think this is probably because ' is treated as REM whic is a statement and so the only 1 command skipped

It works as expected on the picomite (and MMB4W) - rems are ignored.

'
ON ERROR SKIP 1
' test
x = k/0
y = g/0
z = g/0

'
ON ERROR SKIP 1 ' test
x = k/0
y = g/0
z = g/0

both the above ignore the remarks

Jim

VK7JH
MMedit MMBasic Help

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