Laura at 17:38, 29 June 2015

2015-06-29T17:38:09Z

← Older revision		Revision as of 17:38, 29 June 2015
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	Back in the program, X will contain the value of 8 or NewNum.		Back in the program, X will contain the value of 8 or NewNum.

	[[Category:~~Variables~~]]		[[Category:Variable]]

Laura: Created page with "In BR, all variables are global variables, even those used in User Defined Functions. In other words, if your program sets x=4, and your library function includes the line..."

2015-06-29T17:37:44Z

Created page with "In BR, all variables are global variables, even those used in User Defined Functions. In other words, if your program sets x=4, and your library function includes the line..."

New page

In BR, all variables are global variables, even those used in [[User Defined Functions]]. In other words, if your program sets x=4, and your library function includes the line x=7, then if your original program uses x again, it will use the value 7.

However, there is a way to get around this: make X a optional parameter in your user defined function, and do not bring it in.

Program contains:
let X=4

Library function definition includes X after the semi-colon:
def fnModifyRec(FileNumber,SubscriptToRead,RecordNumber;X)

Program calls the fnModifyRec function, without bringing in the variable X:
fnModifyRec(PickFile,PickSub,PickRec)

Back in the program, X is still 4.

In contrast, the following call would make X work like a global variable and alter the value of X in the program, since it uses the optional variable:
fnModifyRec(PickFile,PickSub,PickRec;8)
or
fnModifyRec(PickFile,PickSub,PickRec;NewNum)

Back in the program, X will contain the value of 8 or NewNum.

[[Category:Variables]]

Local variable - Revision history

Laura at 17:38, 29 June 2015

Laura: Created page with "In BR, all variables are global variables, even those used in User Defined Functions. In other words, if your program sets x=4, and your library function includes the line..."