文件名称:
Teach Yourself COBOL in 21 days
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文件大小: 6mb
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上传时间: 2008-08-04
详细说明： Teach Yourself COBOL in 21 Days went through many versions before it was right for the job. Several adventurous volunteers agreed to learn COBOL from scratch by doing each lesson as I completed it, and I installed revisions based on their feedback. For the second edition, each day\'s text incorporated suggestions from the first edition users and then underwent multiple revisions to ensure that it could be easily understood and that the correct gradient approach was used. Concepts are introduced slowly and repeated many times. Th e first edition included four Bonus Day lessons. This new edition has been extended to include two additional Bonus Day lessons, with emphasis on the year 2000 problem.
In many cases, it is difficult to illustrate a programming point by using a full program. The point being highlighted gets lost against the background of all the other things going on in the program.
The answer to this is to write short programs just to show how something works. The problem with this approach is that some examples are silly or trivial programs. One of my more determined volunteers frequently showed up at my desk looking perplexed and asking, \"I understand what the program is doing, but why would anyone ever want a program like this?\"
The answer always is, \"No one would; the example is only to illustrate how that part of the language works.\" I have revised each chapter and added specific comments indicating which examples aren\'t \"real\" programs. If I\'ve missed any of these, and you see a program that seems to do something silly, irrelevant, or useless, be tolerant. Review the program as an example of how the language works and not as a program that you might use for some purpose.
Lots of code is used. COBOL experience comes from writing, reading, and understanding lots of code. Sometimes one point is illustrated by repeating a whole program with only that one point changed.
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