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Representing algorithms

Representing algorithms

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Question 83

An automated commercial greenhouse irrigation controller uses an algorithm to determine the volume of liquid fertilizer (in litres) to deliver to a crop zone based on the average ambient temperature and soil moisture levels.

Using the pseudocode below, complete the trace table.

avgTemp ← USERINPUT
moisturePct ← USERINPUT
irrigationVol ← 0.0
msgNoIrrig ← "Irrigation suspended"
msgManual ← "Requires manual check"
IF avgTemp ≥ 15.0 AND moisturePct < 80.0 THEN
    IF moisturePct < 30.0 THEN
        irrigationVol ← 12.5
        OUTPUT irrigationVol
    ELSE IF moisturePct < 60.0 THEN
        irrigationVol ← (85.0 - moisturePct) * 0.2
        OUTPUT irrigationVol
    ELSE
        OUTPUT msgNoIrrig
    ENDIF
ELSE
    OUTPUT msgManual
ENDIF
Input value of avgTempInput value of moisturePctOutput
22.025.0
18.045.0
[2]
Markscheme

Representing algorithms Questions

  1. GCSE
  2. /Computer Science
  3. /Representing algorithms

208 exam-style questions on AQA GCSE Computer Science Representing algorithms. Each one has a worked solution and a mark scheme showing where the marks go.

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