GCSE AQA Computer Science Designing, Creating & Refining Algorithms: The algorithm shown in Figure 1

Question

The algorithm shown in Figure 1 is designed to help an athlete with their training. It uses two subroutines getBPM() and wait():

- getBPM() returns the athlete's heart rate in beats per minute from an external input device.
- wait(n) pauses the execution of the algorithm for n seconds, so wait(60) would pause the algorithm for 60 seconds.

Line numbers have been included but are not part of the algorithm.

**Figure 1**

1. seconds ← 0
2. rest ← 50
3. REPEAT
4.    bpm ← getBPM()
5.    effort ← bpm - rest
6.    IF effort < 30 THEN
7.       OUTPUT ‘faster’
8.    ELSE
9.       IF effort < 50 THEN
10.          OUTPUT ‘steady’
11.      ELSE
12.          OUTPUT ‘slower’
13.      ENDIF
14.  ENDIF
15.  wait(60)
16.  seconds ← seconds + 60
17. UNTIL seconds > 200

The algorithm shown in Figure 1 is designed to help an athlete with their training - AQA - GCSE Computer Science - Question 2 - 2021 - Paper 1

Worked Solution & Example Answer:The algorithm shown in Figure 1 is designed to help an athlete with their training - AQA - GCSE Computer Science - Question 2 - 2021 - Paper 1

State the most appropriate data type of the variable seconds in the algorithm shown in Figure 1.

Explain why rest could have been defined as a constant in the algorithm shown in Figure 1.

State the line number where iteration is first used in the algorithm shown in Figure 1.

Complete the trace table for the algorithm shown in Figure 1.

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seconds	bpm	effort	OUTPUT
0	70	20	faster
60	80	30	faster
120	100	50	steady
180	120	70	slower
240