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37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
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An **argument** or parameter is information that a [statement](statement), [sub (explanatory)](sub-(explanatory)), [function (explanatory)](function-(explanatory)) or [metacommand](metacommand) needs to carry out the task it has been given. Sometimes a argument can be optional and is not needed for the task to be carried out, in such case it will use a default instead of the argument when carrying out the task.
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It is currently not possible to make arguments optional in user-defined [SUB](SUB)s or [FUNCTION](FUNCTION)s, but Galleon (the creator of QB64) is planning that functionality in the future.
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Arguments that are optional will be enclosed with [ and ] brackets in syntax descriptions.
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More than one argument or parameter are separated by commas.
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## Example(s)
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The color argument in PSET is optional
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```vb
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SCREEN 13
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PSET (160, 100)
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PSET (165, 100), 15
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```
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Must place a comma to seperate arguments if you use any other argument after it.
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```vb
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SCREEN 13
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LINE (160, 100)-(170, 110), , B
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LINE (162, 102)-(168, 108), 4, BF
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```
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As you can see in the above example some statements have special arguments like B and BF in this case (B stands for Box and BF stands for Box Fill), if the argument isn't used then it will create a ordinary line.
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## See Also
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* [SUB](SUB), [FUNCTION](FUNCTION)
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* [Statement](Statement), [Function (explanatory)](Function-(explanatory)), [Sub (explanatory)](Sub-(explanatory)), [Metacommand](Metacommand), [Expression](Expression)
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