Flow-control structures: Difference between revisions
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=={{header|C++}}== |
=={{header|C++}}== |
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=== goto === |
=== goto === |
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{{works with|GCC|3.3.4}} |
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#include <iostream> |
#include <iostream> |
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=== Exceptions === |
=== Exceptions === |
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{{works with|GCC|4.0.2}} |
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Exceptions are a way to give control back to a direct or indirect caller in case of an error. Note that throwing exceptions is usually very expensive, therefore they generally should only be used for exceptional situations. |
Exceptions are a way to give control back to a direct or indirect caller in case of an error. Note that throwing exceptions is usually very expensive, therefore they generally should only be used for exceptional situations. |
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=={{header|Perl}}== |
=={{header|Perl}}== |
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{{works with|Perl|5.x}} |
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===goto=== |
===goto=== |
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===The "with" statement=== |
===The "with" statement=== |
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{{works with|Python|2.6}} |
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See [[http://www.python.org/peps/pep-0343.html PEP 0343, The "with" statement]] |
See [[http://www.python.org/peps/pep-0343.html PEP 0343, The "with" statement]] |
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>>> with open("some_file"): # file ``some_file`` is closed after ``with`` block in any case whether an exception is raised or not |
>>> with open("some_file"): # file ``some_file`` is closed after ``with`` block in any case whether an exception is raised or not |
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... raise Exception("an error") |
... raise Exception("an error") |
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===Yield expressions=== |
===Yield expressions=== |
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{{works with|Python|2.5}} |
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See [[http://www.python.org/peps/pep-0342.html PEP 0342, Coroutines via Enhanced Generators]] |
See [[http://www.python.org/peps/pep-0342.html PEP 0342, Coroutines via Enhanced Generators]] |
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>>> value = 1 |
>>> value = 1 |
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