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You have been asked to assist in creating an application to control a smart television set (TV) - NSC Information Technology - Question 5 - 2024 - Paper 2
Question 5
You have been asked to assist in creating an application to control a smart television set (TV). The GUI below has already been designed. Identify TWO different typ... show full transcript
Worked Solution & Example Answer:You have been asked to assist in creating an application to control a smart television set (TV) - NSC Information Technology - Question 5 - 2024 - Paper 2
Step 1
Identify TWO different types of components on the GUI above which can be replaced with more suitable components and motivate why.
Answer
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The Edit box (Select channel) can be replaced with a combo box or spin edit to limit user input to predefined values, thus reducing the risk of human error.
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The radio group (TV volume) could be replaced with a spin edit or slider, offering a more intuitive interface that allows for precise adjustments of the TV volume.
Step 2
Explain the purpose of the AssignFile-statement with specific reference to the two arguments tFile and 'countries.txt'.
Answer
The AssignFile statement links the internal file variable tFile with the external file 'countries.txt'. This establishes a connection which allows the program to read from or write to that specified file on disk.
Step 3
Explain why an error will occur if the Reset(tFile) in the given code is replaced with Append(tFile).
Answer
An error will occur because Append(tFile) is designed to open a file for adding new data at the end. However, if the file does not already exist, an EOF marker will not be available, resulting in a runtime error.
Step 4
Explain why no output will be displayed if Reset(tFile) is replaced with Rewrite(tFile).
Answer
Using Rewrite(tFile) will clear the contents of the file before any data is read, resulting in an empty file. Consequently, the ReadLn function cannot read any data, leading to no output being displayed.
Step 5
Complete the pseudocode by writing down the remainder of the steps to solve the problem.
Answer
Step 3: Set HCF := 1 Step 4: For counter from iLower down to 1 do Step 5: If (iLower mod counter = 0) AND (iUpper mod counter = 0) then Step 6: HCF := counter Step 7: End if Step 8: End for Step 9: Output HCF
Step 6
Step 7
Explain why a runtime error will occur if the value of 1 is not provided from the length of the array in line number.
Answer
If the value of 1 is not used to determine the upper bound in the for loop, it would lead to out-of-bounds access, as the program would attempt to compare elements that do not exist, causing a runtime error.
Step 8
Discuss the purpose of line 9 to line 11 of the provided code by explaining what the code does.
Answer
Lines 9 to 11 are used to swap the elements in the array. Line 9 stores the value of arrNames[i] in a temporary variable 'sTemp'. Line 10 assigns arrNames[i] the value of arrNames[i + 1]. Finally, line 11 assigns 'sTemp' back to arrNames[i + 1]', thus effectively swapping the two elements.