Computer Programmin Chapter 5

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trailer record

aka dummy data or sentinel value, contains a value in the particular field chosen for the loop test that is different form any possible valid value for the field

priming read

a READ statement that goes first , it geos the computer ready to make the loop test

detail line

a line of output associated with one input record

total line

a line that represents cumulative information form one or more input records.

automatic end-of-file facility

each programing language provides a specific way to implement this test. at design time simply noting that a check for an EOF condition is needed is sufficient

trailer record logic

last input record to the control the loop. this last record serves as a signal to the computer that no more records are to be processed

named constant

memory location whose content is not allowed to change during program execution

loop read

second READ statement, it is within the loop, usually the loop's last statement

heading line

serves as a title to a report

empty file condition

the test results will be true only if there is no input data


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