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DotNet » Curl Content Language » userpage » QbasicFAQ_WhereToGetIt » Calculating and Validating NMEA Checksums » JAD » TurboCppHelloWorld » burst » Alpha » CDataType » QbasicFAQ_Function

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What is a function?


Back to QBasic FAQ Main Page.

A FUNCTION is similar to a Declared SUB. It too is DECLAREd, and uses parameters that can be past when it is invoked. The main difference is that the FUNCTION is used more as a way to add to QB's already defined functions/commands. A function (typically), is used to do some mathematical operation. Be it a Boolean choice, or an algebraic function.

Once DECLAREd the FUNCTION can be used much like a command already in QB.

Example:

DECLARE FUNCTION Area (Length, Width)
'
INPUT "Enter the width"; W
INPUT "Enter the length"; L
Total = Area(L,W)
PRINT Total
END
'------------------------------------
FUNCTION Area (Length, Width)
Area = Length * Width
END SUB

Not the best example, after all, you could probably calculate the area, right there inline much faster, but it shows a simple example.

FUNCTIONs need not necessarily be mathematical in nature, the "SUB Center" example could easily have been a function instead. A FUNCTION needs to have at least on value to return when called.
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