Let - Revision history

John: /* Exceptions */

2017-10-05T14:28:50Z

Exceptions

← Older revision		Revision as of 14:28, 5 October 2017
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	Following the keywords [[then]] or [[else]] each of these keywords require a preceding "Let"		Following the keywords [[then]] or [[else]] each of these keywords require a preceding "Let"
	* fn... (any ~~user designed~~ [[~~function~~]] call)		* fn... (any [[User Defined Functions]] call)
	* [[curfld]]		* [[curfld]]
	* [[fkey]]		* [[fkey]]

2017-10-05T14:28:07Z

Automated Insertion

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   if x=1 then let fn_do_something
-Usually let is optional, few statements require its use, but BR! almost always automatically adds it when it's appropriate.
+Usually let is optional, few statements require its use, but BR! almost always automatically adds it when it's appropriate.  See exceptions below.
 === See Also ===

2014-05-05T15:22:19Z

Syntax

← Older revision		Revision as of 15:22, 5 May 2014
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	=== Syntax ===		=== Syntax ===
	LET {{<numeric variable>=\|<string variable>=}[,...] {<numeric expression>\|<string expression>}\|<function>\|<library function>} [<error condition> <line ref>][,...]		LET {{<[[numeric variable]]>=\|<[[string variable]]>=}[,...] {<[[numeric expression]]>\|<[[string expression]]>}\|<[[function]]>\|<[[library function]]>} [<[[error condition]]> <[[line ref]]>][,...]
	[[Image:Let.png\|600px]]		[[Image:Let.png\|600px]]

2014-04-28T16:10:54Z

Syntax

← Older revision		Revision as of 16:10, 28 April 2014
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	=== Syntax ===		=== Syntax ===
	LET {<numeric\|string variable>=}<numeric\|string expression> \| <function> \| <library function> [{<error condition> <line ref>,}]		LET {{<numeric variable>=\|<string variable>=}[,...] {<numeric expression>\|<string expression>}\|<function>\|<library function>} [<error condition> <line ref>][,...]
	[[Image:Let.png\|600px]]		[[Image:Let.png\|600px]]

2014-04-24T18:50:41Z

Syntax

← Older revision		Revision as of 18:50, 24 April 2014
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	=== Syntax ===		=== Syntax ===
			LET {<numeric\|string variable>=}<numeric\|string expression> \| <function> \| <library function> [{<error condition> <line ref>,}]
	[[Image:Let.png\|600px]]		[[Image:Let.png\|600px]]

2014-04-17T04:42:28Z

Parameters

← Older revision		Revision as of 04:42, 17 April 2014
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	"Library function" names a function within a library that has already been identified.		"Library function" names a function within a library that has already been identified.

			"Function" can be any function.

	LET provides error processing with the optional "error-cond line-ref" parameter. See [[Error Conditions]] for more information.		LET provides error processing with the optional "error-cond line-ref" parameter. See [[Error Conditions]] for more information.

2014-04-14T21:07:57Z

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-The '''Let''' (LE) [[Statement]] evaluates a numeric or string expression and optionally assigns the value of the expression to one or more variables. Four numeric assignment [[Operations|operators]] (+=, -=, *= and /=) are now supported for the LET statement. These operators can be used when adding, subtracting, multiplying, or dividing a variable and assigning the result to the same variable. Thus, a statement previously coded as LET NUM_Days=NUM_Days+6 can now be coded as:
+The '''Let''' (LE) [[Statement]] evaluates a numeric or string expression and optionally assigns the value of the expression to one or more variables.
- LET NUM_Days+=6
+LET is also used when calling functions. When LET is used this way, imagine that you're assigning the results of the function to a variable but the variable part is optional.
-See [[Library Facility]] for more information.
+In BR, the LET statement is typed for you almost any time its required. So its usually not necessary to actually write LET in your programs.
 === Comments and Examples ===
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 Functions that do not return values generally perform other operations, such as displaying lines to the screen.
 === Syntax ===
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 === Automated Insertion ===
-"Let" is automatically inserted in most situations, however a few require typing the word, as in the following example:
   if x=1 then fn_do_something ! Incorrect

2013-07-22T20:28:20Z

← Older revision		Revision as of 20:28, 22 July 2013
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	Besides offering substantial savings in code size and execution time, this feature helps prevent the typing errors that can occur with the use of longer variable names.		Besides offering substantial savings in code size and execution time, this feature helps prevent the typing errors that can occur with the use of longer variable names.

	LET is also used to load a library function into present memory and run it. See [[Library Facility]] for more information.		LET is also used to load a library function into present memory and run it. In the following example, the Fntotalsales is called from the program (aka library) Sales1. Line 510 will provide the outcome of the function for the current program.

			00500 library "sales1" : Fntotalsales
			00510 let Totalsales=Fntotalsales(Sales,Comrate,.0825,Tax,Commission)

			See [[Library Facility]] for more information.

	=== Comments and Examples ===		=== Comments and Examples ===

2013-04-27T15:40:49Z

2013-04-27T15:40:34Z

Parameters

← Older revision		Revision as of 15:40, 27 April 2013
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	"Num-expr" and "string-expr" are required parameters that represent expressions to be evaluated to a single value. This is the value that will be assigned to the num- var or string-var variables described above. In general, expressions allow variables or functions (or operands) to be combined by one or more operators (e.g.: +, -, , /, *, &, substring).		"Num-expr" and "string-expr" are required parameters that represent expressions to be evaluated to a single value. This is the value that will be assigned to the num- var or string-var variables described above. In general, expressions allow variables or functions (or operands) to be combined by one or more operators (e.g.: +, -, , /, *, &, substring).

			"Library function" names a function within a library that has already been identified.

	LET provides error processing with the optional "error-cond line-ref" parameter. See [[Error Conditions]] for more information.		LET provides error processing with the optional "error-cond line-ref" parameter. See [[Error Conditions]] for more information.