Exceptions: Difference between revisions
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[[Category:Flow control]]
This task is to give an example of an exception handling routine
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A catch causes all the statements preceding it within a block to be the implicit try block.
▲<syntaxhighlight lang="langur"># do something
throw "not a math exception"
catch
if
# change result...
} else {
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} else {
# no exception
}
...▼
An else section on a catch is optional. You can also use else if.
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An exception variable may be specified, or you can simply use the implicit variable, which is _err.
<syntaxhighlight lang="langur">
100 / 0
catch {
if _err
# change result
123
} else {
# rethrow the exception
throw
}
}
<syntaxhighlight lang="langur">
safediv(7, 0) # 0
</syntaxhighlight>
=={{header|Lasso}}==
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=={{header|Pascal}}==
See [[Exceptions#Delphi | Delphi]]
=={{header|PascalABC.NET}}==
User defined exceptuin class
<syntaxhighlight lang="delphi">
type MyException = class(Exception) end;
</syntaxhighlight>
Throw an exception
<syntaxhighlight lang="delphi">
raise new MyException;
</syntaxhighlight>
Catch an exception
<syntaxhighlight lang="delphi">
try
except
on e: MyException do
statement
end;
</syntaxhighlight>
=={{header|Perl}}==
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