Assignment Operations - Revision history

Laura at 00:58, 2 July 2015

2015-07-02T00:58:53Z

← Older revision		Revision as of 00:58, 2 July 2015
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	There are two assignment operations in BR: the equal sign '''=''', which denotes ''regular'' assignment, and the colon-equal sign ''':=''', which denotes ''forced'' assignment,		There are two assignment operations in BR: the equal sign '''=''', which denotes ''regular'' assignment, and the colon-equal sign ''':=''', which denotes ''forced'' assignment.

	~~They are similar in how they work with a slight difference~~.

	Both of them are [[Binary operations]], which means they take two arguments - one on the left side of the operator, and another one on the right and both may be used with [[Numeric]] and [[String]] [[Variable\|variables]].		Both of them are [[Binary operations]], which means they take two arguments - one on the left side of the operator, and another one on the right and both may be used with [[Numeric]] and [[String]] [[Variable\|variables]].
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	00010 if (x:=5) > 2 then print "The forced-assigned value is larger than 2"		00010 if (x:=5) > 2 then print "The forced-assigned value is larger than 2"

	'''Note''' that when this assignment operation is used in any expression (for example: in the condition of an [[IF]] [[THEN]] statement), parentheses must be used to clarify the order of execution Otherwise, unexpected results may occur.		'''Note''' that when this assignment operation is used in any expression (for example, in the condition of an [[IF]] [[THEN]] statement), parentheses must be used to clarify the order of execution. Otherwise, unexpected results may occur.

			===When Used in IF Statements==

	~~'''IMPORTANT NOTE:''' when~~ the equal sign is used in an [[IF Statement]], it is '''NOT''' used for assignment. Instead, it is used for '''comparison'''. Consider the example below:		When the equal sign is used in an [[IF Statement]], it is '''NOT''' used for assignment. Instead, it is used for '''comparison'''. Consider the example below:

	00010 let x = 1 ! assignment takes place		00010 let x = 1 ! assignment takes place
	00020 let y = 1000 ! assignment takes place		00020 let y = 1000 ! assignment takes place
	00030 if x = y ~~then~~ print "1 is equal to 1000" ! assignment DOES NOT takes place		00030 IF x = y THEN print "1 is equal to 1000" ! assignment DOES NOT takes place

	~~In the above example, assignment DOES NOT takes place, instead the IF statement evaluates to FALSE and the '''print''' statement DOES NOT execute.~~

			In the above example, assignment DOES NOT takes place in line 30, instead the IF statement evaluates to FALSE and the '''print''' statement DOES NOT execute.

	~~'''IMPORTANT NOTE:''' when~~ the equal sign is used in an [[IF Statement]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:		When the equal sign is used in an [[IF Statement]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:

	00010 let x = 1 ! assignment takes place		00010 let x = 1 ! assignment takes place
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	~~'''IMPORTANT NOTE:'''~~ when the '''forced assignment operation :=''' is used in an [[IF Statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:		In contrast, when the '''forced assignment operation :=''' is used in an [[IF Statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:

	00010 let x = 1		00010 let x = 1
	00020 if x:=2 then print "forced assignment as a condition of an if statement always evaluates to true"		00020 if x:=2 then print "forced assignment as a condition of an if statement always evaluates to true"

			Line 20 will change the value of x to 2 (forced assignment) and then print the statement.

			====Final Example====

			00010 let x=4
			00020 print (x==5)
			00030 print x

			Line 10 assigns the value of 4 to X. Line 20 will compare X and 5, and return the boolean value 0, since x does not equal to 5. Line 30 will print the value 4.

			00040 print x:=6

			Line 40 will assign the value 6 to X, and print 6.

	<noinclude>		<noinclude>

Laura at 00:33, 2 July 2015

2015-07-02T00:33:58Z

← Older revision		Revision as of 00:33, 2 July 2015
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	They are similar in how they work with a slight difference.		They are similar in how they work with a slight difference.

	Both of them are [[Binary operations]], which means they take two arguments - one on the left side of the operator, and another one on the right.		Both of them are [[Binary operations]], which means they take two arguments - one on the left side of the operator, and another one on the right and both may be used with [[Numeric]] and [[String]] [[Variable\|variables]].

	[[Numeric]] and [[String]] [[Variable\|variables]] ~~both may be used with regular and forced assignment operations~~.

	===Regular Assignment===		===Regular Assignment===

Laura: /* Forced Assignment */

2013-01-15T01:33:42Z

Forced Assignment

← Older revision		Revision as of 01:33, 15 January 2013
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	'''IMPORTANT NOTE:''' when the equal sign is used in an [[~~If]] [[statement~~]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:		'''IMPORTANT NOTE:''' when the equal sign is used in an [[IF Statement]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:

	00010 let x = 1 ! assignment takes place		00010 let x = 1 ! assignment takes place
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	'''IMPORTANT NOTE:''' when the '''forced assignment operation :=''' is used in an [[~~If]] [[statement~~]], it is used for '''forced assignment, not for comparison.''' Consider the example below:		'''IMPORTANT NOTE:''' when the '''forced assignment operation :=''' is used in an [[IF Statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:

	00010 let x = 1		00010 let x = 1

Laura: /* Forced Assignment */

2013-01-15T01:32:13Z

Forced Assignment

← Older revision		Revision as of 01:32, 15 January 2013
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	'''IMPORTANT NOTE:''' when the equal sign is used in an [[~~If]] [[statement~~]], it is '''NOT''' used for assignment. Instead, it is used for '''comparison'''. Consider the example below:		'''IMPORTANT NOTE:''' when the equal sign is used in an [[IF Statement]], it is '''NOT''' used for assignment. Instead, it is used for '''comparison'''. Consider the example below:

	00010 let x = 1 ! assignment takes place		00010 let x = 1 ! assignment takes place

Mikhail.zheleznov: edit

2012-01-11T08:48:42Z

edit

← Older revision		Revision as of 08:48, 11 January 2012
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	<noinclude>		<noinclude>
	[[Category:operations]]		[[Category:operations]]
			[[Category:Assignment operations]]
	</noinclude>		</noinclude>

Mikhail.zheleznov: edit

2012-01-11T08:33:54Z

edit

← Older revision		Revision as of 08:33, 11 January 2012
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	They are similar in how they work with a slight difference.		They are similar in how they work with a slight difference.

	Both of them are [[Binary operations]], which means they take two arguments - one on the left, and another one on the right.		Both of them are [[Binary operations]], which means they take two arguments - one on the left side of the operator, and another one on the right.

	[[Numeric]] and [[String]] [[Variable\|variables]] both may be used with regular and forced assignment operations.		[[Numeric]] and [[String]] [[Variable\|variables]] both may be used with regular and forced assignment operations.
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	00010 let 5 = x ! incorrect		00010 let 5 = x ! incorrect

	~~The disadvantage of the equal sign assignment operation '''=''' is that it may only be used as a separate statement.~~

	===Forced Assignment===		===Forced Assignment===

	~~If your programming needs call for multiple operations in one statement, you may use the '''forced assignment''' operation ''':='''.~~ The example below assigns the value of 5 to x and then compares the value of x (which is now 5) to the value of 2:		The example below forced-assigns the value of 5 to x and then compares the value of x (which is now 5) to the value of 2:

	00010 if (x:=5) > 2 then print "The forced-assigned value is larger than 2"		00010 if (x:=5) > 2 then print "The forced-assigned value is larger than 2"

Mikhail.zheleznov: moved Assignment Operators to Assignment Operations

2012-01-11T07:24:12Z

moved Assignment Operators to Assignment Operations

← Older revision	Revision as of 07:24, 11 January 2012
(No difference)

Mikhail.zheleznov: edit

2012-01-10T17:43:56Z

edit

← Older revision		Revision as of 17:43, 10 January 2012
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	There are two assignment ~~operators~~ in BR: the equal sign '''=''', which denotes ''regular'' assignment, and the colon-equal sign ''':=''', which denotes ''forced'' assignment,		There are two assignment operations in BR: the equal sign '''=''', which denotes ''regular'' assignment, and the colon-equal sign ''':=''', which denotes ''forced'' assignment,

	They are similar in how they work with a slight difference.		They are similar in how they work with a slight difference.

	Both of them are [[Binary ~~operators~~]], which means they take two arguments - one on the left, and another one on the right.		Both of them are [[Binary operations]], which means they take two arguments - one on the left, and another one on the right.

	[[Numeric]] and [[String]] [[Variable\|variables]] both may be used with regular and forced assignment ~~operators~~.		[[Numeric]] and [[String]] [[Variable\|variables]] both may be used with regular and forced assignment operations.

	===Regular Assignment===		===Regular Assignment===
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	00010 let 5 = x ! incorrect		00010 let 5 = x ! incorrect

	The disadvantage of the equal sign assignment ~~operator~~ '''=''' is that it may only be used as a separate statement.		The disadvantage of the equal sign assignment operation '''=''' is that it may only be used as a separate statement.

	===Forced Assignment===		===Forced Assignment===

	If your programming needs call for multiple operations in one statement, you may use the '''forced assignment''' ~~operator~~ ''':='''. The example below assigns the value of 5 to x and then compares the value of x (which is now 5) to the value of 2:		If your programming needs call for multiple operations in one statement, you may use the '''forced assignment''' operation ''':='''. The example below assigns the value of 5 to x and then compares the value of x (which is now 5) to the value of 2:

	00010 if (x:=5) > 2 then print "The forced-assigned value is larger than 2"		00010 if (x:=5) > 2 then print "The forced-assigned value is larger than 2"

	'''Note''' that when this assignment ~~operator~~ is used in any expression (for example: in the condition of an [[IF]] [[THEN]] statement), parentheses must be used to clarify the order of execution Otherwise, unexpected results may occur.		'''Note''' that when this assignment operation is used in any expression (for example: in the condition of an [[IF]] [[THEN]] statement), parentheses must be used to clarify the order of execution Otherwise, unexpected results may occur.


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	'''IMPORTANT NOTE:''' when the '''forced assignment ~~operator~~ :=''' is used in an [[If]] [[statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:		'''IMPORTANT NOTE:''' when the '''forced assignment operation :=''' is used in an [[If]] [[statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:

	00010 let x = 1		00010 let x = 1
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	<noinclude>		<noinclude>
	[[Category:~~Operators~~]]		[[Category:operations]]
	</noinclude>		</noinclude>

Mikhail.zheleznov: edit

2012-01-10T17:28:39Z

edit

← Older revision		Revision as of 17:28, 10 January 2012
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	'''Note''' that when this assignment operator is used in any expression (for example: in the condition of an [[IF]] [[THEN]] statement), parentheses must be used to clarify the order of execution Otherwise, unexpected results may occur.		'''Note''' that when this assignment operator is used in any expression (for example: in the condition of an [[IF]] [[THEN]] statement), parentheses must be used to clarify the order of execution Otherwise, unexpected results may occur.


	'''IMPORTANT NOTE:''' when the equal sign is used in an [[If]] [[statement]], it is '''NOT''' used for assignment. Instead, it is used for '''comparison'''. Consider the example below:		'''IMPORTANT NOTE:''' when the equal sign is used in an [[If]] [[statement]], it is '''NOT''' used for assignment. Instead, it is used for '''comparison'''. Consider the example below:
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	In the above example, assignment DOES NOT takes place, instead the IF statement evaluates to FALSE and the '''print''' statement DOES NOT execute.		In the above example, assignment DOES NOT takes place, instead the IF statement evaluates to FALSE and the '''print''' statement DOES NOT execute.


	'''IMPORTANT NOTE:''' when the equal sign is used in an [[If]] [[statement]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:		'''IMPORTANT NOTE:''' when the equal sign is used in an [[If]] [[statement]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:
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	For clarity, it may be better to use '''==''' for comparison.		For clarity, it may be better to use '''==''' for comparison.


	'''IMPORTANT NOTE:''' when the '''forced assignment operator :=''' is used in an [[If]] [[statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:		'''IMPORTANT NOTE:''' when the '''forced assignment operator :=''' is used in an [[If]] [[statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:

Mikhail.zheleznov: edit

2012-01-10T17:27:23Z

edit

← Older revision		Revision as of 17:27, 10 January 2012
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	In the above example, assignment DOES NOT takes place, instead the IF statement evaluates to FALSE and the '''print''' statement DOES NOT execute.		In the above example, assignment DOES NOT takes place, instead the IF statement evaluates to FALSE and the '''print''' statement DOES NOT execute.

	~~----~~

	'''IMPORTANT NOTE:''' when the equal sign is used in an [[If]] [[statement]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:		'''IMPORTANT NOTE:''' when the equal sign is used in an [[If]] [[statement]], it is equivalent to using two equal signs '''=='''. So the above example is identical in effect to the one below:
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	For clarity, it may be better to use '''==''' for comparison.		For clarity, it may be better to use '''==''' for comparison.


	~~----~~

	'''IMPORTANT NOTE:''' when the '''forced assignment operator :=''' is used in an [[If]] [[statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below:		'''IMPORTANT NOTE:''' when the '''forced assignment operator :=''' is used in an [[If]] [[statement]], it is used for '''forced assignment, not for comparison.''' Consider the example below: