Chapter 4 - Revision history

Mikhail.zheleznov: /* 4.3 String constants & variables */ Added more detailed explanation

2019-11-24T17:21:44Z

4.3 String constants & variables: Added more detailed explanation

← Older revision		Revision as of 17:21, 24 November 2019
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	The DIM statement is a statement used to specify how long a string variable used in your program will be if its size may be longer than 18 characters. The DIM statement can also be used to decrease this limit.		The DIM statement is a statement used to specify how long a string variable used in your program will be if its size may be longer than 18 characters. The DIM statement can also be used to decrease this limit.

	For future reference: When we refer to a DIM statement, we may also say that a string variable was dimensioned. For example, DIM S$*255 is the same as saying that the string variable S$ was dimensioned to 255 characters.		For future reference: When we refer to a DIM statement, we may also say that a string variable was dimensioned. For example, DIM S$*255 is the same as saying that the string variable S$ was dimensioned to 255 characters. Another way of saying this is that 255 bytes of memory was allocated for variable s$.

	To allow 80 characters of input in our program, you should add the following line:		To allow 80 characters of input in our program, you should add the following line:

Mikhail.zheleznov: /* 4.3 String constants & variables */ corrected program error by adding a line number and moving line segment to a separate line

2019-11-24T17:16:01Z

4.3 String constants & variables: corrected program error by adding a line number and moving line segment to a separate line

← Older revision		Revision as of 17:16, 24 November 2019
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	00310 PRINT "Hello, isn't it a great day!!!!"		00310 PRINT "Hello, isn't it a great day!!!!"
	00320 LET CITY$='Honolulu'		00320 LET CITY$='Honolulu'
	00330 PRINT "This is Bruno's computer -- keep your hands off" -----------------------PRINT 'A double quotation mark means " should be used'		00330 PRINT "This is Bruno's computer -- keep your hands off" -----------------------
			00340 PRINT 'A double quotation mark means " should be used'
	00350 PRINT "A double quotation mark means "" should be used"		00350 PRINT "A double quotation mark means "" should be used"

Mikhail.zheleznov: /* 4.2 Numeric expressions */ The word "user" is not a good way to refer to an operator

2019-11-24T17:11:40Z

4.2 Numeric expressions: The word "user" is not a good way to refer to an operator

← Older revision		Revision as of 17:11, 24 November 2019
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	A complex expression is an expression that combines two or more operands, i.e. numeric constants or numeric variables, using operations such as addition, subtraction, multiplication and division.		A complex expression is an expression that combines two or more operands, i.e. numeric constants or numeric variables, using operations such as addition, subtraction, multiplication and division.

	For example, 51+3 combines the constants 51 and 3 using the addition ~~user~~, the plus sign. The operands 51 and 3 are combined using the ~~user~~ for addition. The calculated value of this particular numeric expression is 54. So 51+3, 51-3, 513 ( is the ~~user~~ for multiplication) and 51/3 (/ is the ~~user~~ for division) are all fine upstanding examples of numeric expressions.		For example, 51+3 combines the constants 51 and 3 using the addition operator, the plus sign. The operands 51 and 3 are combined using the operator for addition. The calculated value of this particular numeric expression is 54. So 51+3, 51-3, 513 ( is the operator for multiplication) and 51/3 (/ is the operator for division) are all fine upstanding examples of numeric expressions.

	One other operations that you might see occasionally is for exponents, also called raising a number to a power. AB means to take the number A and multiply it times itself B times. For example:		One other operations that you might see occasionally is for exponents, also called raising a number to a power. AB means to take the number A and multiply it times itself B times. For example:
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	The statement “PRINT 5**3” will print the value 125.		The statement “PRINT 5**3” will print the value 125.

	A complex expression can also include more than one ~~user~~. Remember using Business Rules! as a calculator in the previous chapters?		A complex expression can also include more than one operator. Remember using Business Rules! as a calculator in the previous chapters?

	What answer do you get from the following?		What answer do you get from the following?
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	PRINT 1+2*3		PRINT 1+2*3

	Do you think it will be 9 or 7? The correct answer is 7. When there is more than one ~~user~~, it is important to know which operations get done first. Here are the rules that Business Rules! uses:		Do you think it will be 9 or 7? The correct answer is 7. When there is more than one operator, it is important to know which operations get done first. Here are the rules that Business Rules! uses:

	1. Parenthesis		1. Parenthesis
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	2) A numeric expression can appear wherever an integer constant is allowed. <br>		2) A numeric expression can appear wherever an integer constant is allowed. <br>
	3) A numeric expression is a type of statement. <br>		3) A numeric expression is a type of statement. <br>
	4) For numeric expressions with more than one ~~user~~, the order of execution is multiplication or division before addition or subtraction, then exponentiation. <br>		4) For numeric expressions with more than one operator, the order of execution is multiplication or division before addition or subtraction, then exponentiation. <br>
	5) ((1+2)+3)**(1)+(1)=7 <br>		5) ((1+2)+3)**(1)+(1)=7 <br>
	6) What number would Business Rules! compute for the following numeric expressions? Figure them out first by yourself, then use PRINT to check your answers - but be careful not to make any typing mistakes. <br>		6) What number would Business Rules! compute for the following numeric expressions? Figure them out first by yourself, then use PRINT to check your answers - but be careful not to make any typing mistakes. <br>

Mikhail.zheleznov: /* Quick Quiz 4.1 */ corrected prior change

2019-11-24T17:07:29Z

Quick Quiz 4.1: corrected prior change

← Older revision		Revision as of 17:07, 24 November 2019
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	{\|		{\|
	1. \|syntax rules		\|1. syntax rules
	\|		\|
	\|a. Parts of a statement and their order		\|a. Parts of a statement and their order

Mikhail.zheleznov: /* Quick Quiz 4.1 */ added options 1,2 and a,b to match with the Quiz answers

2019-11-24T17:05:34Z

Quick Quiz 4.1: added options 1,2 and a,b to match with the Quiz answers

← Older revision		Revision as of 17:05, 24 November 2019
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	{\|		{\|
	\|syntax rules		1. \|syntax rules
	\|		\|
	\|Parts of a statement and their order		\|a. Parts of a statement and their order
	\|-		\|-
	\|Semantic rules		\|2. Semantic rules
	\|		\|
	\|Purpose (or meaning) of a statement		\|b. Purpose (or meaning) of a statement
	\|-		\|-
	\|}		\|}

Laura: /* Chapter Exercise */

2013-08-16T17:10:45Z

Chapter Exercise

← Older revision		Revision as of 17:10, 16 August 2013
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	After you’re successful or give up, here's an [[Solutions#CHAPTER 4\|example]] answer to compare yours with.		After you’re successful or give up, here's an [[Solutions#CHAPTER 4\|example]] answer to compare yours with.

	NEXT:[[Chapter 5]]		NEXT:[[Chapter 5\|GOTO, IF, and Other Basic Statements]]

	[[BR Tutorial\|Back to Index]]		[[BR Tutorial\|Back to Index]]

Laura at 01:20, 16 July 2013

2013-07-16T01:20:32Z

← Older revision		Revision as of 01:20, 16 July 2013
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	<noinclude>		<noinclude>
	[[Category:Tutorial]]		[[Category:Tutorial 1]]
	</noinclude>		</noinclude>

Laura: /* Chapter Exercise */

2013-07-15T21:01:35Z

Chapter Exercise

← Older revision		Revision as of 21:01, 15 July 2013
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	[[BR Tutorial\|Back to Index]]		[[BR Tutorial\|Back to Index]]

			<noinclude>
			[[Category:Tutorial]]
			</noinclude>

Laura: /* Chapter Exercise */

2013-07-02T20:24:49Z

Chapter Exercise

← Older revision		Revision as of 20:24, 2 July 2013
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	The challenge is simply putting this formula into terms that Business Rules! can understand. As an employed programmer, you will need to think of the formulas or algorithms for the problems you are trying to solve before you translate them into BR! language.		The challenge is simply putting this formula into terms that Business Rules! can understand. As an employed programmer, you will need to think of the formulas or algorithms for the problems you are trying to solve before you translate them into BR! language.

	After you’re successful or give up, here's an [[Solutions#CHAPTER 4\|example]] answer to compare:		After you’re successful or give up, here's an [[Solutions#CHAPTER 4\|example]] answer to compare yours with.

	NEXT:[[Chapter 5]]		NEXT:[[Chapter 5]]

	[[BR Tutorial\|Back to Index]]		[[BR Tutorial\|Back to Index]]

Laura: /* Chapter Exercise */

2013-07-02T20:24:11Z

Chapter Exercise

← Older revision		Revision as of 20:24, 2 July 2013
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	The challenge is simply putting this formula into terms that Business Rules! can understand. As an employed programmer, you will need to think of the formulas or algorithms for the problems you are trying to solve before you translate them into BR! language.		The challenge is simply putting this formula into terms that Business Rules! can understand. As an employed programmer, you will need to think of the formulas or algorithms for the problems you are trying to solve before you translate them into BR! language.

	After you’re successful or give up, here's an example answer to compare:		After you’re successful or give up, here's an [[Solutions#CHAPTER 4\|example]] answer to compare:

	~~[[image:4.4.png]]~~

	NEXT:[[Chapter 5]]		NEXT:[[Chapter 5]]

	[[BR Tutorial\|Back to Index]]		[[BR Tutorial\|Back to Index]]