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Computer Science · May / June 2023 · Paper 22 · Question 4

0478

As printed in the paper

The question as text

A program needs to make sure the value input for a measurement meets the following rules: • the value is a positive number • a value is always input • the value is less than 1000.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 4(a)[3]

    One mark for each point (max three).

    range check with acceptable values is (greater than) zero and less than 1000
    presence check to ensure the program will not continue until a value has been entered
    type/character check to ensure that a number is entered
    length check to ensure there are no more than 3 digits entered

  • 4(b)(i)[1]

    To verify the data / for verification / as a verification check // to make sure that no changes are made to the data on entry

  • 4(b)(ii)[3]

    One mark for each point (max three).

    use of iteration
    use of two inputs
    to check that the two inputs are the same / different
    use of the given variable Measurement

    For example

    REPEAT

    OUTPUT "Please enter measurement "

    INPUT Measurement

    OUTPUT "Please re-enter measurement "

    INPUT MeasurementCheck

    UNTIL Measurement = MeasurementCheck

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