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Hikers use a distance chart to plan their hiking trips - NSC Information Technology - Question 4 - 2021 - Paper 1
Question 4
Hikers use a distance chart to plan their hiking trips. Checkpoints refer to rest areas or overnight locations on a hiking trail. A distance chart consists of the di... show full transcript
Worked Solution & Example Answer:Hikers use a distance chart to plan their hiking trips - NSC Information Technology - Question 4 - 2021 - Paper 1
Step 1
Button - [4.1 – Display distance chart]
Answer
To display the distance chart, follow these steps:
- Loop through the checkpoints: Use a loop from 1 to 5 to iterate over the rows in the
arrDistancesarray. - Add names to output string: For each iteration, append the corresponding checkpoint name from
arrNamesto the output string. - Nested Loop for distances: Implement a nested loop from 1 to 5 to access each distance in the
arrDistancesarray. - Test distances: For each distance, check the value at
arrDistances[i][j]and append it to the output string, ensuring proper formatting with commas separating the values. - Display the output: Finally, output the constructed string in the rich edit control to show the distance chart.
Step 2
Button - [4.2 – Validation]
Answer
To validate the distances, perform the following steps:
- Outer Loop for checkpoints: Loop from 1 to 5 to ensure every checkpoint is validated.
- Inner Loop for distances: Again, loop from 1 to 5 within the outer loop.
- Test conditions: For each pair of checkpoints, validate the relationship between distances by ensuring:
arrDistances[i][j]should not be the same asarrDistances[j][i].- Additionally, check if
arrDistances[i][j] < arrDistances[j][i]for validating directional distances.
- Construct output: Build a validation output string indicating any discrepancies found among the distances.
- Display validation output string: Finally, display the resulting string detailing the validation results.
Step 3
Button - [4.3 – Route planner]
Answer
For the route planner button, follow these steps:
- Extract the selected route from the combo box, initializing total distance to 0.
- Loop through selected points: Use a loop to extract each point in the selected route, identifying the first checkpoint's index and the next checkpoint's index.
- Distance calculations: Utilize the
arrDistancesarray to access the distance between the two points and add it to total distance. - Time Calculation: Multiply the calculated total distance by a time factor, e.g., time per km (if provided).
- Display Results: Format and display the total distance and estimated time within the user interface, ensuring clarity in the output.