A-LevelComputer ScienceProgramming9618/23 · Oct/Nov 2024 · Q27 Marks
An algorithm will: 1. prompt and input a sequence of 100 integer values, one at a time 2. sum the positive integers 3. output the result of the sum.
- (a)Write pseudocode for the algorithm. Assume the value zero is neither positive nor negative. You must declare all variables used in the algorithm.[5]
- (b)The algorithm requires the use of basic constructs. One of these is sequence. Identify one other basic construct required by the algorithm and describe how it is used. Construct Use[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2024). The mark or mark type is shown in brackets.
- [1] MP1 Declarations of all variables used
- [1] MP2 Loop for 100 iterations
- [1] MP3 Prompt and input a value in a loop and
- [1] MP4 Test for value > 0 // >=1 in a loop
- [1] MP5 Sum the Total in a loop
- [1] MP6 Output of Total after the loop
- [1] MP1 Construct: Iteration / Repetition
- [1] MP2 Use: To loop through all 100 inputs // To loop 100 times
- [1] ALTERNATIVE: MP1 Construct: Selection
- [1] MP2 Use: To test whether the value input is positive
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