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.

Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

1. [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
2. [1] To verify the data / for verification / as a verification check // to make sure that no changes are made to the data on entry
3. [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