File Processing With Cobol pdf epub mobi txt 电子书 下载 2024


File Processing With Cobol

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发表于2024-11-13

File Processing With Cobol epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024

File Processing With Cobol epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024

File Processing With Cobol pdf epub mobi txt 电子书 下载 2024



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ntrOduCtiOn<br >LE HANDLING<br > This book presents the basic concepts of file processing using the<br >COBOL computer programming language. This chapter provides a short<br >introduction to files and a framework for the logic which is used in the<br >programs of this book.<br > We are all familiar with files that are not computer related. For exam-<br > ~}le, many files are maintained in file folders in file cabinets. Data in these<br >~iles may be typed or written, if we want to change these data, we open the<br >file cabinet and make the necessary changes. We can add new records by<br >~)reparing a new file foMer and including it in the appropriate position in<br >;he file.Records can be remove(1 an(I discarded when they are no longer<br >:leede(l.<br > l~et s look at a specific example. Suppose that the manager of a dormi-<br >Lory facility has a file on paper in which information about residents is main-<br >:ained.There is one file folder for each resident. Each folder contains a<br >~ esident s name, room number, sex, and other" information. The records<br >are placed in alphabetical order" by the resident s name. As people move<br >n and out of the dormitory, records are added or deleted. As people<br >:hange rooms the file is opened, and room numbers are changed.<br > In this example the total collection of information is a file. A file is a<br >: ollection of records which are related in some way and which are main-<br >.ained in some order. Here we have established information about indi-<br >dduals living in a dormitory in order by name.<br > The information about one individual is a record. In out" record we have<br >

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