A-LevelComputer ScienceProgramming9618/21 · May/June 2024 · Q111 Marks
An algorithm is developed in pseudocode before being coded in a programming language.
- (a)The following table shows four valid pseudocode assignment statements. Complete the table by giving an appropriate data type to declare each of the variables A, B, C and D. Assignment statement Data type A ← LEFT(MyName, 1) B ← Total * 2 C ← INT(ItemCost) / 3 D ← "Odd OR Even"[4]
- (b)Other variables in the program have example values as shown: Variable Value Sorted False Tries 9 ID "ZGAC001" Complete the table by evaluating each expression, using the example values. Expression Evaluates to Tries < 10 AND NOT Sorted Tries MOD 4 TO_LOWER(MID(ID, 3, 1)) LENGTH(ID & "xx") >= Tries[4]
- (c)(i)The variable names A, B, C and D in part (a) are not good programming practice. (i) State why these variable names are not suitable.[1]
- (c)(ii)(ii) Identify one problem that these variable names might cause.[1]
- (c)(iii)(iii) The choice of suitable variable names is one example of good programming practice. Give one other example.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2024). The mark or mark type is shown in brackets.
- [4] One mark per row
- CHAR / STRING
- INTEGER / REAL
- REAL
- STRING
- [4] One mark per row
- TRUE
- 1
- 'a' // "a"
- TRUE
- [1] The names do not reflect / indicate the purpose of the variable // the names are not meaningful
- [1] They make the program more difficult to understand / debug / maintain
- [1] One mark from:
- • Indentation / use of white space
- • Capitalisation of keywords
- • Use of comments
- • Use of modular programming
- • Use of local variables
- Note: max 1 mark
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