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Inside Back Cover

The Sams Teach Yourself in 24 Hours Series

Sams Teach Yourself in 24 Hours books provide quick and easy answers in a proven step-by-step approach that works for you. In just 24 sessions of one hour or less, you will tackle every task you need to get the results you want. Let our experienced authors present the most accurate information to get you reliable answers—fast!

Sams Teach Yourself COBOL in 24 Hours consists of five parts. In each part, you learn and build upon all the elements of the COBOL language, writing programs and improving upon them as your competency increases. You study the different types of data handled by COBOL and how to use this data in your programs. You learn the integral parts of a COBOL program and how to communicate through the user interface.

You will understand the numerous and varied types of data that can be manipulated in a COBOL program. You will learn about alphanumeric and numeric data items and edit patterns. You also will learn about COBOL levels and their uses, as shown in the following table.

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You program a basic user interface with the Screen Section, one way of communicating with the end user of your program, and the elements relating to it. The first portion of the screen description is a level 01 group item. This item describes the name of the screen and any special attributes that are to be applied to the entire screen. These special attributes are

• The Blank Screen clause causes the screen to be cleared when the screen is displayed.

• The Blank Line clause causes the line on which the elementary screen item appears to be cleared before the screen is displayed.

• The Foreground-Color and Background-Color clauses specify the colors for the display. Their values are integer values between zero and seven.

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• The Erase clause is followed by one of two values. EOL causes the erase to clear from the beginning column of the screen item to the end of the line. EOS causes the screen to be cleared from the beginning of the screen item to the end of the screen.

• Blink causes the associated screen item to blink on the screen.

• Highlight causes the associated screen item to be highlighted, or brightened, on the screen.

• Lowlight causes the associated screen item to be dimmed. If the system does not support the dimming of an item, standard intensity is used. For a PC, this is the case.

• Reverse-Video causes the screen item to appear in inverse video. This is accomplished by reversing the values of the foreground and background colors.

• Underline causes the screen item to appear underlined on systems that can support the underlined display attribute. The Fujitsu compiler on the PC supports the use of the Underline clause.

• The Bell clause causes a beep or bell to sound when the screen item is displayed. It can be used to get the attention of the user.

• The Line Number and Column Number clauses are used to specify the line and column position of the first character in the screen item. The first line on the screen is line 1 and the first column is column 1. You may abbreviate the clause by leaving out the word Number, specifying only Line or Column. What follows is an expanded example, showing some screen literals. The first is an underlined heading line. The next is a name field heading that is highlighted and sounds the bell when displayed. Take special note of the subordinate level numbers.

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COBOL in 24 Hours Image

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Interesting COBOL-Related Web Sites The Fujitsu COBOL home page:

   http://www.adtools.com

The Flexus home page:

   http://www.flexus.com

The Grace Hopper home page:

   http://www.chips.navy.mil/chips/grace_hopper/

Judson McClendon’s home page—COBOL source examples:

   http://personal.bhm.bellsouth.net/bhm/j/u/judmc/

COBOL—Easy Took Kit—ETK:

   http://www.etk.com

England Technical Services—COBOL tools:

   http://www.netins.net/showcase/etsinc/

The current status of the COBOL standard:

   http://www.mfltd.co.uk/Standards/

The Future of COBOL:

   http://www.objectz.com/cobolworld/

The Author’s home page:

   http://www.geocities.com/Eureka/2006/

By opening this package, you are agreeing to be bound by the following agreement:

Some of the programs included with this product are governed by the GNU General Public License, which allows redistribution; see the license information for each product for more information. Other programs are included on the CD-ROM by special permission from their authors.

You may not copy or redistribute the entire CD-ROM as a whole. Copying and redistribution of individual software programs on the CD-ROM is governed by terms set by individual copyright holders. The installer and code from the author is copyrighted by the publisher and the author. Individual programs and other items on the CD-ROM are copyrighted by their various authors or other copyright holders. This software is sold as-is without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Neither the publisher nor its dealers or distributors assumes any liability for any alleged or actual damages arising from the use of this program. (Some states do not allow for the exclusion of implied warranties, so the exclusion may not apply to you.)

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