5.1 Procedures and functions are used to enhance modularity in programs - NSC Information Technology - Question 5 - 2017 - Paper 2
Question 5
5.1 Procedures and functions are used to enhance modularity in programs.
5.1.1 State TWO advantages of modular programming.
5.1.2 Distinguish between a private fun... show full transcript
Worked Solution & Example Answer:5.1 Procedures and functions are used to enhance modularity in programs - NSC Information Technology - Question 5 - 2017 - Paper 2
Step 1
5.1.1 State TWO advantages of modular programming.
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Answer
Easier to debug/fore bugs: Modular programming allows developers to isolate and correct issues in individual modules without affecting the entire program.
Reuse of code: Modules can be reused in different programs or parts of the same program, promoting efficiency and reducing duplication.
Step 2
5.1.2 Distinguish between a private function and a public function.
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Private Function: Accessible only within the class or unit it is defined in, providing encapsulation.
Public Function: Accessible from outside the class, allowing for interaction with other parts of the program.
Step 3
5.2.1 bAnswer := y = z;
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Since both y and z are initialized to 4, the expression evaluates to True. Therefore, bAnswer will be True.
Step 4
5.2.2 If (NOT (x)) AND (y <> 4) then
bAnswer := true;
else
bAnswer := false;
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In this case, x is false, so NOT (x) is True. However, since y is 4, y <> 4 evaluates to False. The combined condition becomes True AND False, which is False. Therefore, bAnswer will be set to False.
Step 5
5.3 Complete the missing block of the pseudocode.
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To complete the pseudocode, we need to reverse the input word. Conditionally check against the reversed word for both equality and palindrome status:
reverseWord ⇐ ''
for loop from length of word down to 1
reverseWord ⇐ reverseWord + word[loop]
end for
If word = reverseWord then
Output 'Word is a palindrome'
else
Output 'Word is NOT a palindrome'
This will correctly determine if the provided word is a palindrome.
Step 6
5.4.1 The values in the array indicated in the diagram...
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To calculate the total value of the left diagonal area, we can implement the following single-loop approach:
// Initialize total sum
iSum := 0;
// Loop through indices of the array
for r := 1 to 5 do
iSum := iSum + arrLightBulbs[r, r];
end for;
This will add all the arrays in the left diagonal only.
Step 7
5.4.2(a) arrLightBulbs[5, 3] := 7;
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Type of Error: Syntax Error. This is because the index exceeds the declared size of the array which is only 5x5.
Step 8
5.4.2(b) arrLightBulbs[2, 2, 4] := 9;
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Type of Error: Syntax Error. The array is declared with only two dimensions and accessing three indices is invalid.
Step 9
5.4.2(c) Code must be added to save the data in a text file.
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Type of Error: Logical Error. The code needs to implement file handling to achieve data persistence, which is not being done here.
Step 10
5.5.1(a) objSchool.create('MySchool',500);
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Error: Object cannot instantiate itself. The object creation command is incorrect since it must assign the result of the constructor to a variable.
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Error: Incorrect order of arguments/parameters. The data types passed do not align with the class definition, which expects a String for SchoolName and an Integer for Learners.
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Error: Data type type mismatch. Using a string instead of an integer for the number of learners violates the type requirement established in the class declaration.
Step 13
5.5.2(a) Change the number of learners per teacher.
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Method Type: Mutator. This method will modify the existing data in the class.
Step 14
5.5.2(b) Calculate the ratio of the number of learners per teacher.
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Method Type: Accessor. This method retrieves and calculates information without modifying the state of the class.
