Args.GetFloat (gb.args)
Static Function GetFloat ( ShortName As String, LongName As String [ , Description As String, ArgName As String, Default As Float ] ) As Float
Define an option that takes one floating point number argument, and return it.
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ShortName is the short name of the option without the dash. (i.e.
"o" for -o).
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LongName is the full name of the option without the two dashes (i.e.
"option" for --option).
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Description is an optional text that describes the option. This will be used if the
--help option is requested.
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ArgName is the name of the option argument used by the
--help option.
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Default is the default value that will be returned if the option is not specified.
The floating point number always uses the American format.