Computer Science 9618/23 — October/November 2023
Cambridge AS Level · Fundamental Problem-solving and Programming Skills · worked solutions for every part, with the mark scheme
Topics Programming · Data Types and Structures · Software Development · Algorithm Design and Problem-solving
Refer to the insert for the list of pseudocode functions and operators.
A program is being developed in pseudocode before being converted into a programming language.
The following table shows four valid pseudocode assignment statements.
Complete the table by giving the data type that should be used to declare the variable underlined in each assignment statement.
| Assignment statement | Data type |
|---|---|
MyVar1 ← Total1 / Total2 | |
MyVar2 ← 27/10/2023 | |
MyVar3 ← "Sum1 / Sum2" | |
MyVar4 ← Result1 AND Result2 |
Other variables in the program have example values as shown:
| Variable | Value |
|---|---|
Active | TRUE |
Fraction | 0.2 |
Code | "Ab12345" |
Complete the table by evaluating each expression using the example values.
| Expression | Evaluates to |
|---|---|
Fraction >= 0.2 AND NOT Active | |
INT((Fraction * 100) + 13.3) | |
STR_TO_NUM(MID(Code, 4, 2)) + 5 | |
LENGTH("TRUE" & Code) |
The program makes use of complex statistical functions. The required functions are not built-in to the programming language and are too complicated for the programmer to write.
One solution would be to employ another programmer who has experience of writing these functions, as there is no time to train the existing programmer.
State one other way that these functions may be provided for inclusion in the program.
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The hardware that runs the program is changed and the program needs to be modified so that it works with the new hardware.
Identify the type of maintenance that this represents and give one other reason why this type of maintenance may be needed.
Type ..........................................................................................................................................
Reason .....................................................................................................................................
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