Question 11

Edge Races are developing a program to process information on races with multiple stages.

The first race has four stages as shown below.

The design for part of the program is shown below.

6.1 Loop 4 times 
6.2     Get valid distance for stage

2.1 start fixed loop 12 times
2.2     add calories[index] to total
2.3     add 1 to index
2.4 end fixed loop
2.5 avgCalories = total / 12

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(a) The distance of a stage can range from 5 to 75 km.

(i) Using a design technique of your choice, refine step 6.2 to check the user enters a valid distance.

4 marks

(ii) Test data is used to ensure the distance entered is valid.

State the type of test in the table below.

(b) The following lines of code are written to input the distance for each stage of ‘Race one’.

…
Line 6 FOR stage FROM 0 TO 3 DO
Line 7     RECEIVE distance FROM KEYBOARD
…

Changes should be made to the code above to ensure that any number of stages could be processed.

Describe two changes that would be required.

(c) Edge Races classify races as ‘beginner’, ‘intermediate’ or ‘advanced’ based on the total distance of the race. The program displays the classification after calculating the total distance.

…
Line 25 <calculate the total distance for the race>
Line 26 IF totalDistance < 25 THEN
Line 27     SET race TO "beginner"
Line 28 END IF
Line 29 IF totalDistance >= 25 OR totalDistance <=100 THEN
Line 30     SET race TO "intermediate"
Line 31 END IF
Line 32 IF totalDistance > 100 THEN
Line 33     SET race TO "advanced"
Line 34 END IF
Line 35 SEND race TO DISPLAY
…

2 marks

(i) When tested the code produced an unexpected result.

Identify the type of error in the code above.

(ii) The code above is inefficient.

Using a programming language of your choice, re‑write lines 26 to 34 to make this more efficient.

(d) During execution the code is translated.

State the type of translator that has been used.

(e) The average stage distance for each race is calculated and stored in the variable avgDistance.

(i) Using a programming language of your choice, write the code to store the average to 1 decimal place.

(ii) The average stage distance should be displayed, as shown below for ‘Race one’.

Using a programming language of your choice and the variable avgDistance, write the code to produce the output above.