The Preparation of Programs for an Electronic Digital Computer: With Special Reference to the EDSAC and the Use of a Library of Subroutines

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Addison-Wesley Press, 1951 - Calculators - 167 pages
 

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Page 31 - ... indicate both desirable and undesirable conditions. Debugging output statements can be easily removed when the program is accepted as correct or changed to comments so that they can be used later if needed. It is usually easier to include these debugging statements when the program is being written than to wait until the program has been tried and found to fail.
Page 29 - ... LC. 3. Mark program name on the tops of the deck. 4. Mark diagonal or cross strips on the top of the deck. This practice makes identification and location easy during debugging. It will also help indicate shuffled decks. SIMPLE CODING Simple, straightforward coding is a great help when debugging. It is easier to avoid and detect errors if the program is written in an orderly and logical manner. In the early stages of writing a complicated program, do not hesitate to rewrite sections if it will...
Page 23 - II', handles a set of simultaneous first-order differential equations in which each derivative is expressed explicitly in terms of the dependent variables.
Page 24 - G1 should be placed in the upper half of the store to obtain maximum accuracy (the ideal position is 386 onwards). This is because one of the orders forms part of a constant which thus depends slightly on the location of the routine. In normal use the effect is quite negligible...
Page 154 - RI and (2) as a working position used in the evaluation of each function value fi in turn. The interpretation of these numbers in terms of the actual x Ref.

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