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Generally a default argument will behave identically to an argument passed by parameter or a local variable declared at the start of the function, and have the same scope and extent (lifetime) as a parameter or other local variable, namely an automatic variable which is deallocated on function termination.
You can use default parameter values to effect a parameter alias: For example, if parameters "text" and "message" are names for the same parameter, which can also be specified as the only unnamed parameter, then refer to the parameter with {{{message|{{{text|{{{1|}}}}}. If the template call specifies more than one of those parameters, "message ...
An output parameter, also known as an out parameter or return parameter, is a parameter used for output, rather than the more usual use for input. Using call by reference parameters, or call by value parameters where the value is a reference, as output parameters is an idiom in some languages, notably C and C++, [ b ] while other languages have ...
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One use of default parameters is for initial settings for application software. For example, the first time a user runs an application it may suggest that the user's delivery address is in the United States. This default might be appropriate if more users of that application were in the US than any other country.
If the result, f([b]) or the empty string, is for final display only, i.e., not for use in expressions for template names, parameter names, parameter values, page names in links, etc., an alternative is using CSS, see MediaWiki talk:Common.css.
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Allows a user to specify customized default parameters for the DIR command, including file specifications. Preset default switches can be overridden by providing the negative switch on the command line. For example, if %DIRCMD% contains the /W switch, then it can be overridden by using DIR /-W at the command line.