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 distances between different checkpoints on a hiking trail. Do the following: Open the incomplete program in the Question 4 folder. Enter your examination number as a comment in the first line of the Question4_U.pas file. Compile and execute the program. The program has no functionality currently. Example of the graphical user interface (GUI):

Photo AI

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]

96%

114 rated

Answer

To implement the display of the distance chart, follow these steps:

Loop through Checkpoints: Create a loop running from 1 to 5 to iterate through each checkpoint:
```
for i := 1 to 5 do
begin
```
Construct Output String: Initialize an output string that will contain names from arrNames:
```
OutputString := '';
```
Nested Loop for Distances: Use a nested loop from 1 to 5 to access the distance:
```
for j := 1 to 5 do
begin
```
Add Checkpoint Names: Append checkpoint names to the output string for each iteration:
```
OutputString := OutputString + arrNames[i] + ', ';
```
Display Distances: For each pair of checkpoints, append the corresponding distance from arrDistances:
```
OutputString := OutputString + FloatToStr(arrDistances[i][j]) + ', ';
```
Final Formatting: Ensure to format the output string correctly before displaying it:
```
OutputString := Trim(OutputString);
RichEdit1.Lines.Add(OutputString);
```
End of Loops: Close the loops appropriately:
```
end;
end;
```

Step 2

Button - [4.2 – Validation]

99%

104 rated

Answer

For button functionality related to validation, follow these steps:

Loop Through Checkpoints: Start with a loop from 1 to 5 for validating distances:
```
for i := 1 to 5 do
begin
```
Check Valid Distances: Create a nested loop to check if distances are valid:
```
for j := 1 to 5 do
begin
if (arrDistances[i][j] <> -1) then
```

Build Output String: Build a validation output based on the distances checked:

ValidationOutput := ValidationOutput + 'Distance from ' + arrNames[i] + ' to ' + arrNames[j] + ' is ' + FloatToStr(arrDistances[i][j]) + ' km.';

Display Results: Finally, present the validation results in the GUI:
```
RichEdit1.Lines.Add(ValidationOutput);
```
Close Nested Loop: End your nested loop and the main loop correctly:
```
end;
end;
```

Step 3

Button - [4.3 – Route planner]

96%

101 rated

Answer

To implement the route planner functionality, proceed with the following steps:

Extract Selected Route: Retrieve the selected route from the combo box:
```
SelectedRoute := ComboBox1.Text;
```
Initialize Distance Variable: Initialize a variable to store total distance:
```
TotalDistance := 0;
```
Loop for Route Calculation: Create a loop to parse through each checkpoint combination:
```
for i := 1 to length(SelectedRoute) - 1 do
begin
```

Extract Checkpoints: Extract first and second checkpoints using string manipulation:

FirstCheckpointIndex := StrToInt(SelectedRoute[i]);
SecondCheckpointIndex := StrToInt(SelectedRoute[i + 1]);

Calculate Distance: Add the distance between these checkpoints to TotalDistance:

TotalDistance := TotalDistance + arrDistances[FirstCheckpointIndex][SecondCheckpointIndex];

Display Distance: Finally, show the total distance to the user:

ShowMessage('Total Distance: ' + FloatToStr(TotalDistance) + ' km.');

Hikers use a distance chart to plan their hiking trips - NSC Information Technology - Question 4 - 2021 - Paper 1

Worked Solution & Example Answer:Hikers use a distance chart to plan their hiking trips - NSC Information Technology - Question 4 - 2021 - Paper 1

Button - [4.1 – Display distance chart]

Button - [4.2 – Validation]

Button - [4.3 – Route planner]

Join the NSC students using SimpleStudy...