A-LevelComputer ScienceAlgorithm design and problem-solving9618/23 · Oct/Nov 2022 · Q35 Marks
An algorithm is needed to process a sequence of numbers. Numbers may be positive or negative and may be integer or decimal. The algorithm will: • prompt and input one number at a time until the value zero is input • sum the negative numbers • sum the positive numbers • when zero is input, output the two sum values and then end. Describe the algorithm needed. Do not include pseudocode statements in your answer.
- An algorithm is needed to process a sequence of numbers. Numbers may be positive or negative and may be integer or decimal. The algorithm will: • prompt and input one number at a time until the value zero is input • sum the negative numbers • sum the positive numbers • when zero is input, output the two sum values and then end. Describe the algorithm needed. Do not include pseudocode statements in your answer.[5]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.
- [5] One mark per point, for example: 1 Declare two (REAL) variables for the two sum values AND initialise both to zero 2 Prompt AND Input a number 3 If number greater than zero add to positive sum and If number less than zero add to negative sum 4 Repeat from step 2 if number not zero 5 After loop the Output SumPos and SumNeg
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