Chapter 9 - Revision history

Laura: /* Quick Quiz 9.5 */

2013-08-16T17:16:21Z

Quick Quiz 9.5

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	NEXT:[[Chapter 10]]		NEXT:[[Chapter 10\|Arrays]]

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

Laura at 01:22, 16 July 2013

2013-07-16T01:22:11Z

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	<noinclude>		<noinclude>
	[[Category:Tutorial]]		[[Category:Tutorial 1]]
	</noinclude>		</noinclude>

Laura: /* Quick Quiz 9.5 */

2013-07-15T21:04:04Z

Quick Quiz 9.5

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

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

Laura: /* Quick Quiz 9.5 */

2013-07-03T20:29:28Z

Quick Quiz 9.5

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	c. Causes lines 70 and 130 to be deleted. <br>		c. Causes lines 70 and 130 to be deleted. <br>

	Answers: <br>		[[Answers 9.5]] <br>
	~~1-d; 2-c; 3-c; 4-c; 5-b.~~

	NEXT:[[Chapter 10]]		NEXT:[[Chapter 10]]

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

Laura: /* Quick Quiz 9.4 */

2013-07-03T20:28:24Z

Quick Quiz 9.4

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	c. whenever you know of two or more files that could fit the file-ref description. <br>		c. whenever you know of two or more files that could fit the file-ref description. <br>

	Answers: <br>		[[Answers 9.4]] <br>
	~~1-d; 2-a; 3-d; 4-a; 5-b.~~

	===The Auto Command ===		===The Auto Command ===

Laura: /* MKDIR Command */

2013-07-03T20:27:44Z

MKDIR Command

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	MKDIR \TEST - Makes a new folder called TEST which is a sub-folder of the root folder on the current default drive. <br>		MKDIR \TEST - Makes a new folder called TEST which is a sub-folder of the root folder on the current default drive. <br>

	MKDIR C:\TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the root folder on drive C) and gives an error if there isn’t any such folder. If TEST is found, this command makes a new folder called NEXTTEST, located on drive C, in a sub-folder called TEST which is a sub-folder of the root folder (current default drive and folder are not used). <br>		MKDIR C:\TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the root folder on drive C) and gives an error if there isn’t any such folder. If TEST is found, this command makes a new folder called NEXTTEST, located on drive C, in a sub-folder called TEST which is a sub-folder of the root folder (current default drive and folder are not used). <br>

	MKDIR TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the current folder) and gives an error if it doesn’t exist. If TEST is found, it makes a new folder called NEXTTEST, which is a sub-folder to TEST, which is a sub-folder of the current default folder on the current default drive. <br>		MKDIR TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the current folder) and gives an error if it doesn’t exist. If TEST is found, it makes a new folder called NEXTTEST, which is a sub-folder to TEST, which is a sub-folder of the current default folder on the current default drive. <br>

Laura: /* MKDIR Command */

2013-07-03T20:27:15Z

MKDIR Command

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	“drive:” tells Business Rules! which memory device it should use when creating the new folder or sub-folder. The drive letter must be followed with a colon (:). The parameter “drive:” is optional; if it is omitted, Business Rules! will use the current default drive. <br>		“drive:” tells Business Rules! which memory device it should use when creating the new folder or sub-folder. The drive letter must be followed with a colon (:). The parameter “drive:” is optional; if it is omitted, Business Rules! will use the current default drive. <br>

	“path” specifies the name of the new folder to be created. It may be either an absolute path or a relative path. Remember, absolute paths start with a backslash to indicate that the path you are specifying begins at the root folder. Also, relative paths do not start with a backslash; the system assumes that the current default folder is the starting point and that the “path” that you provide tells where to go from there. <br>		“path” specifies the name of the new folder to be created. It may be either an absolute path or a relative path. Remember, absolute paths start with a backslash to indicate that the path you are specifying begins at the root folder. Also, relative paths do not start with a backslash; the system assumes that the current default folder is the starting point and that the “path” that you provide tells where to go from there. <br>

	Here are some examples. Remember, paths that start with a backslash have effects independent of the current default folder, but effects of relative paths depend on the default folder. <br>		Here are some examples. Remember, paths that start with a backslash have effects independent of the current default folder, but effects of relative paths depend on the default folder. <br>

	MKDIR TEST - Makes a new folder called TEST, which is a sub-folder of the current default folder on the current default drive. <br>		MKDIR TEST - Makes a new folder called TEST, which is a sub-folder of the current default folder on the current default drive. <br>

	MKDIR \TEST - Makes a new folder called TEST which is a sub-folder of the root folder on the current default drive. <br>		MKDIR \TEST - Makes a new folder called TEST which is a sub-folder of the root folder on the current default drive. <br>

	MKDIR C:\TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the root folder on drive C) and gives an error if there isn’t any such folder. If TEST is found, this command makes a new folder called NEXTTEST, located on drive C, in a sub-folder called TEST which is a sub-folder of the root folder (current default drive and folder are not used). <br>		MKDIR C:\TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the root folder on drive C) and gives an error if there isn’t any such folder. If TEST is found, this command makes a new folder called NEXTTEST, located on drive C, in a sub-folder called TEST which is a sub-folder of the root folder (current default drive and folder are not used). <br>

	MKDIR TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the current folder) and gives an error if it doesn’t exist. If TEST is found, it makes a new folder called NEXTTEST, which is a sub-folder to TEST, which is a sub-folder of the current default folder on the current default drive. <br>		MKDIR TEST\NEXTTEST - Looks for a sub-folder called TEST (which must be a sub-folder of the current folder) and gives an error if it doesn’t exist. If TEST is found, it makes a new folder called NEXTTEST, which is a sub-folder to TEST, which is a sub-folder of the current default folder on the current default drive. <br>

	MKDIR D:SUBDIR\TEST - Looks for a sub-folder called SUBDIR (which must be a sub-folder of the current folder) on drive D, and gives an error if it doesn’t exist. If SUBDIR is found, this command makes a new folder called TEST, which is a sub-folder to SUBDIR, which is a sub-folder of the current default folder on drive D (current default drive is not used, but the current default folder is used). <br>		MKDIR D:SUBDIR\TEST - Looks for a sub-folder called SUBDIR (which must be a sub-folder of the current folder) on drive D, and gives an error if it doesn’t exist. If SUBDIR is found, this command makes a new folder called TEST, which is a sub-folder to SUBDIR, which is a sub-folder of the current default folder on drive D (current default drive is not used, but the current default folder is used). <br>

Laura: /* CHDIR command */

2013-07-03T20:26:05Z

CHDIR command

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	CHDIR		CHDIR

	It is important to remember that, for this command, there are lots of possible correct replies that your system may return. Your screen will probably look like this:		It is important to remember that, for this command, there are lots of possible correct replies that your system may return. Your screen will probably look like this:

	[[image:9.4.jpg]]		[[image:9.4.jpg]]

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	CHDIR c:\		CHDIR c:\

	Just type DIR C: to see the listing for the root folder.		Just type DIR C: to see the listing for the root folder.

	===DIR Command===		===DIR Command===

Laura: /* Quick Quiz 9.2 */

2013-07-03T20:25:37Z

Quick Quiz 9.2

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	====Quick Quiz 9.2====		====Quick Quiz 9.2====
	1. In which of the following examples will your temporary memory (RAM) be saved?<br>		1. In which of the following examples will your temporary memory (RAM) be saved?<br>

	a) When you shut off your computer without using the SAVE or REPLACE commands.<br>		a) When you shut off your computer without using the SAVE or REPLACE commands.<br>
	b) When you SAVE and or REPLACE your files that you have been working with before you turn your computer off.<br>		b) When you SAVE and or REPLACE your files that you have been working with before you turn your computer off.<br>
	c) The power fails and your computer is shut off. <br>		c) The power fails and your computer is shut off. <br>

	2. The file reference (or file-ref) is... <br>		2. The file reference (or file-ref) is... <br>

	a) A special feature of Business Rules! that you will rarely ever use. <br>		a) A special feature of Business Rules! that you will rarely ever use. <br>
	b) The trail of folders that leads to a particular file.<br>		b) The trail of folders that leads to a particular file.<br>
	c) A combination of drive letter, path, filename and extension (along with the appropriate punctuation) that leads to a particular file. <br>		c) A combination of drive letter, path, filename and extension (along with the appropriate punctuation) that leads to a particular file. <br>

	Answers:<br>		[[Answers 9.2]]<br>
	~~1-b; 2-c.~~

	===9.3 Folder management commands===		===9.3 Folder management commands===

Laura: /* 9.1 Differences between Commands & Statements */

2013-07-03T20:24:33Z

9.1 Differences between Commands & Statements

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	Earlier in this tutorial you learned that you could use PRINT as a command. Although PRINT is most often used as a program statement, Business Rules! also lets you use it without a line number for immediate information about a variable or an arithmetic operation. PRINT works like a command in such cases.		Earlier in this tutorial you learned that you could use PRINT as a command. Although PRINT is most often used as a program statement, Business Rules! also lets you use it without a line number for immediate information about a variable or an arithmetic operation. PRINT works like a command in such cases.

	Except when used within a PROC or with the EXECUTE statement, the commands that you will learn about in this chapter can only be used in immediate mode. This means that they are only commands and cannot be used as statements.		Except when used within a PROC or with the EXECUTE statement, the commands that you will learn about in this chapter can only be used in immediate mode. This means that they are only commands and cannot be used as statements.

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	Assuming that Business Rules! has already been installed to your system and assuming that you are accessing the folder which contains the files for Business Rules!. If you are using Windows, you enter Business Rules! simply by clicking on the BR Native icon, and you can skip this section, as it will benefit mostly Unix or Linux users. In DOS mode, BR used to be opened using the BR command following the prompt (such as A:>, B:>, or C:>) In Linux/Unix, it would follow the ($) sign.		Assuming that Business Rules! has already been installed to your system and assuming that you are accessing the folder which contains the files for Business Rules!. If you are using Windows, you enter Business Rules! simply by clicking on the BR Native icon, and you can skip this section, as it will benefit mostly Unix or Linux users. In DOS mode, BR used to be opened using the BR command following the prompt (such as A:>, B:>, or C:>) In Linux/Unix, it would follow the ($) sign.

	There are three forms of the BR command. You should use the one which is designed for your operating system or Business Rules! version. If you are using the Unix or Linux operating systems, you will need to enter the command in lowercase letters: br, followed by the enter key. If you are using a version of Business Rules! which includes the math co-processor chip, you must enter br 8087 (ENTER). You may use br (ENTER) for all other operating systems or Business Rules! versions.		There are three forms of the BR command. You should use the one which is designed for your operating system or Business Rules! version. If you are using the Unix or Linux operating systems, you will need to enter the command in lowercase letters: br, followed by the enter key. If you are using a version of Business Rules! which includes the math co-processor chip, you must enter br 8087 (ENTER). You may use br (ENTER) for all other operating systems or Business Rules! versions.

	The BR command will cause your screen to go blank for a moment. You will see a sign-on screen with some information about Business Rules! and then the friendly READY prompt will appear in the left corner of the status line. Special technical note: On licensed versions of Business Rules!, this could take 20 seconds unless you hit one of the keys (just pick any one) when the licensing screen (the one with your address) is on the screen.		The BR command will cause your screen to go blank for a moment. You will see a sign-on screen with some information about Business Rules! and then the friendly READY prompt will appear in the left corner of the status line. Special technical note: On licensed versions of Business Rules!, this could take 20 seconds unless you hit one of the keys (just pick any one) when the licensing screen (the one with your address) is on the screen.

	While the BR command is often used in the form described above, its syntax illustrated below also allows you to include up to three additional options. (These three options must be enclosed within quotation marks when you are using Unix/Linux versions of Business Rules!.)		While the BR command is often used in the form described above, its syntax illustrated below also allows you to include up to three additional options. (These three options must be enclosed within quotation marks when you are using Unix/Linux versions of Business Rules!.)

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	If no -filename is specified, Business Rules! will look for a file with the special name BRconfig.sys; if BRconfig.sys cannot be found in the current folder, Business Rules! will use its own set of internal defaults (except for Unix, Linux, and network versions which must have a configuration file).		If no -filename is specified, Business Rules! will look for a file with the special name BRconfig.sys; if BRconfig.sys cannot be found in the current folder, Business Rules! will use its own set of internal defaults (except for Unix, Linux, and network versions which must have a configuration file).

	The BR command allows you to use one, two, or all three of the options described above. You can also condense all of the above options into one command, e.g.:		The BR command allows you to use one, two, or all three of the options described above. You can also condense all of the above options into one command, e.g.:
	BR “CHAIN SHOESALES -08 -CONFIG1”		BR “CHAIN SHOESALES -08 -CONFIG1”

	====The SYSTEM command====		====The SYSTEM command====
	The proper way to exit from Business Rules! is to use the SYSTEM command. SYSTEM may only be used when the READY prompt is showing in the status line. When this command is used, Business Rules! returns you to the operating system. If no other file is active, the operating system prompt should appear. SY is the shortest allowable abbreviation of the SYSTEM keyword:		The proper way to exit from Business Rules! is to use the SYSTEM command. SYSTEM may only be used when the READY prompt is showing in the status line. When this command is used, Business Rules! returns you to the operating system. If no other file is active, the operating system prompt should appear. SY is the shortest allowable abbreviation of the SYSTEM keyword:
	SY (ENTER)		SY (ENTER)


	;Turning off the computer		;Turning off the computer
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	1. What does the BR command do? <br>		1. What does the BR command do? <br>

	a) Allows you to enter the operating system from Business Rules!. <br>		a) Allows you to enter the operating system from Business Rules!. <br>
	b) Allows you to change the operating system prompt from $ to C>. <br>		b) Allows you to change the operating system prompt from $ to C>. <br>
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	2. Which of the following commands allows you to enter Business Rules!, then automatically loads the program WELCOME? <br>		2. Which of the following commands allows you to enter Business Rules!, then automatically loads the program WELCOME? <br>

	a) BR LOAD WELCOME <br>		a) BR LOAD WELCOME <br>
	b) BR -WELCOME <br>		b) BR -WELCOME <br>
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	3. In which of the following instances can you use the SYSTEM command to exit Business Rules!? <br>		3. In which of the following instances can you use the SYSTEM command to exit Business Rules!? <br>

	a) Whenever program execution has been halted or is inactive. <br>		a) Whenever program execution has been halted or is inactive. <br>
	b) When Business Rules! gets stuck in an infinite loop. <br>		b) When Business Rules! gets stuck in an infinite loop. <br>
	c) During READY mode. <br>		c) During READY mode. <br>

	Answers: <br>		[[Answers 9.1]] <br>
	~~1-c; 2-a; 3-c.~~

	===9.2 Memory Structures===		===9.2 Memory Structures===