Flow-control structures: Difference between revisions

=={{header|C++}}==

=== goto ===

#include <iostream>

 

=== Exceptions ===

 

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.

 

=={{header|Perl}}==

 

===goto===

 

===The "with" statement===

See [[http://www.python.org/peps/pep-0343.html PEP 0343, The "with" statement]]

>>> with open("some_file"): # file ``some_file`` is closed after ``with`` block in any case whether an exception is raised or not

... raise Exception("an error")

===Yield expressions===

See [[http://www.python.org/peps/pep-0342.html PEP 0342, Coroutines via Enhanced Generators]]

>>> value = 1