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Representing algorithms

Representing algorithms

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Question 3

An agricultural monitoring system uses a drone to survey a 5x5 grid of land sectors to locate a sector marked as "Dehydrated". The algorithm shown in Figure 1 searches the grid to identify the coordinates of this sector.

Figure 1

targetX = -1
targetY = -1
for y from 0 to 4
    for x from 0 to 4
        if checkSector(x, y) == "Dehydrated" then
            targetX = x
            targetY = y
        endif
    endfor
endfor

Figure 2

Sector X = 0Sector X = 1Sector X = 2Sector X = 3Sector X = 4
Sector Y = 0NormalNormalNormalNormalIrrigated
Sector Y = 1IrrigatedNormalNormalDehydratedNormal
Sector Y = 2NormalNormalNormalNormalNormal
Sector Y = 3NormalIrrigatedNormalNormalNormal
Sector Y = 4NormalNormalIrrigatedNormalNormal

Explain the purpose of the second (inner) iteration structure in the algorithm in Figure 1.

[1]
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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