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By G. T. Lancaster
Programming in COBOL is a straightforward but concise how-to ebook that teaches the programming language in a quick but powerful step by step demeanour, that are simply understood by way of a person with enough wisdom in details know-how.
Covering first some great benefits of COBOL over different programming languages, the e-book discusses COBOL's divisions - id, setting, approach, and knowledge, after which describes the trying out of the COBOL resource courses and software questions. The ebook is effective if you desire to research uncomplicated COBOL language, yet do not need the time to take brands' or technical collage classes. meant readers comprise skilled machine programmers conversant in different programming languages yet no longer with COBOL, in addition to scholars taking a direction in machine technological know-how. The publication can also be invaluable because it comprises self-assessment questions for readers to make sure they understood the rules coated.
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Extra resources for Programming in COBOL. Library of Computer Education
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The programmer has to work it out for himself. This is not difficult, but it is a pity he has to do so. One method of doing this is as follows. D I V I D E TOTAL-1 I N T O S T O C K G I V I N G R E S U L T . M U L T I P L Y R E S U L T BY TOTAL-1 G I V I N G X. SUBTRACT X F R O M STOCK GIVING REMAINDER. The location R E M A I N D E R will now contain the remainder of the first statement. 00 T O T A L (two decimal places) 33 PROGRAMMING IN COBOL 1. Add locations R A T E - 1 , RATE-2, and P R I C E , placing the result in location A M O U N T , showing the contents before and after.
J These tests, of course, may only be applied to numeric data and therefore the data-names must be described as such in the data division. Examples 1. 2. I F N U M B E R - I N IS N E G A T I V E . . I F SUB-TOTAL IS N O T Z E R O . . Class Condition Frequently during validation routines the programmer may wish to test if certain fields contain either only alphabetic characters or only numeric characters. This type of test in COBOL can be done by using class conditional statements. Format ΓNUMERIC I F data-name-1 IS [NOT] 1 1 ALPHABETIC J ...
It is obvious, then, that when calculations are being performed, that the programmer takes the greatest care in defining the final locations to ensure that he obtains the result he desires. We shall see with the other verbs that the programmer should be meticulous in defining data, especially when this data is being transferred from location to location. The receiving location must be correctly defined, in accordance with the wishes of the programmer. On Size Error There is another clause, the O N SIZE E R R O R clause, which is similar to the R O U N D E D clause.