Icon+Unicon/Intro: Difference between revisions
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Terminates the current program and writes the result of expression to a file (&errout by default). |
Terminates the current program and writes the result of expression to a file (&errout by default). |
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====error trapping==== |
====error trapping==== |
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The keyword &error is normally zero, but if set to a positive value, this sets the number of fatal errors that are tolerated |
The keyword '&error' is normally zero, but if set to a positive value, this sets the number of fatal errors that are tolerated (i.e. converted to expression failure). The value of &error is decremented each time this happens. Therefore the now-common TRY-CATCH behaviour can be written as: |
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Various idiomatic simplifications can be applied depending on your needs. |
Various idiomatic simplifications can be applied depending on your needs. |
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====error throwing==== |
====error throwing==== |
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Errors can be thrown using the function runerr(number, variable) |
Errors can be thrown using the function runerr(number, variable) |
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