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In programming, a function can have [optional
parameters](http://en.wikipedia.org/wiki/Parameter_%28computer_programming%29#Default_arguments),
for instance getTemperature() could have an optional parameter "Unit" to say I
want the temperature in Kelvin for instance. By default, when specifying no
parameter, it would be in Celsius.

How to say `optional parameters` in Japanese?

ALC says `オプションのパラメータ`:

> Both required and optional parameters are listed.  
>  必須なパラメータおよびオプションのパラメータを列挙します。

But I believe they are wrong, and their translation has a different meaning.
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2013-07-10T05:54:44.350
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2013-07-10T06:16:54.933
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question
translation computing
Computing: How to say "optional parameters"
You are looking for

> 必須（の/な）引数 => required parameter(s).

and

> 任意（の/な）引数 => optional parameter(s)
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2013-07-10T06:16:54.933
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2013-07-10T06:16:54.933
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answer