Here is a pseudo-code algorithm designed to monitor the expected water flow rate output across 6 stages of a desalination filtration system.
1 # Processing flow rate efficiency across 6 stages
2 SET stageCode TO ["S1", "S2", "S3", "S4", "S5", "S6"]
3 SET efficiencyFactor TO [105, 95, 80, 65, 50, 30]
4 SET validFlow TO False
6 # Validate initial flow rate
7 WHILE (validFlow = False) DO
8 SEND "Enter the initial flow rate (min 1200): " TO DISPLAY
9 RECEIVE initialFlow FROM (INTEGER) KEYBOARD
10
11 IF (initialFlow >= 1200) THEN
12 SET validFlow TO True
13 SEND "Initial flow rate verified: " & initialFlow TO DISPLAY
14 ELSE
15 SEND "Invalid flow rate" TO DISPLAY
16 END IF
17 END WHILE
18
19 # Calculate expected output flow for each stage
20 FOR i FROM 0 TO (LENGTH(stageCode)-1)
21 SET multiplier TO efficiencyFactor[i] / 100
22 SET expectedOutput TO initialFlow * multiplier
23 SEND "Stage " & stageCode[i] & " output: " & expectedOutput TO DISPLAY
24 END FOR
Complete the trace table to show the execution of lines 20 to 24 of the pseudo-code for the iteration where i=3i = 3i=3 when the user enters the value 1600 at line 9.
| initialFlow | i | LENGTH(stageCode) | multiplier | efficiencyFactor[i] | expectedOutput |
|---|---|---|---|---|---|
159 exam-style questions on Edexcel GCSE Computer Science Algorithms, covering Constructs for solving problems, Variables, constants and data structures, Arithmetic, relational and logical operators, Tracing algorithm output with trace tables, Types of error and correcting logic errors, Standard algorithms (sorts and searches), and Evaluating algorithm fitness and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.