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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
State TWO advantages of modular programming.
Answer
- Easier to debug/fever bugs: Modular programming allows for easier troubleshooting as each module can be tested individually.
- Reuse of code/Avoids duplication of code: Once a module is created, it can be reused in different programs, saving time and preventing errors from duplicated code.
Step 2
Step 3
Determine the result of the Boolean variable, bAnswer, in EACH of the following statements:
Answer
5.2.1 bAnswer := y = z;
The value of bAnswer will be True because both y and z have been initialized with the value of 4.
5.2.2 If (NOT (x)) AND (y <> 4) then
bAnswer will be False because y equals 4, making the condition y <> 4 false.
Step 4
Complete the missing block of the pseudocode to construct the word that was entered in reverse format.
Answer
To reverse the string, you can use the following pseudocode:
reverseWord ⇐ ''
for loop from 1 to length of word do
reverseWord ⇐ word[loop] + reverseWord
end for
This will construct reverseWord by adding characters from word in reverse order.
Step 5
The values in the array indicated in the diagram (left diagonal area) must be added to find a total value.
Answer
To achieve a total using a single loop:
iSum := 0;
iRows := 5;
for r := 1 to iRows do
iSum := iSum + arrLightBulbs[r, r];
end for;
This uses only one loop to go through each index where row equals column.
Step 6
Indicate in EACH case the type of error (syntax/runtime/logical) that occurred as a result of the incorrect statement.
Answer
(a) arrLightBulbs[5, 3] := 7; Type of Error: Syntax error - as index 5 is out of bounds in a 5x5 array.
(b) arrLightBulbs[2, 2, 4] := 1; Type of Error: Syntax error - the array only takes two indices.
(c) Type of Error: Logical error - the statement is vague and does not specify how to save data.
Step 7
Identify AND briefly explain the error in EACH statement.
Answer
(a) objSchool.create('MySchool',500); Error: This statement will throw an error because it is attempting to call a method, but the object must be instantiated first.
(b) objSchool := TSchool.create(80,'MySchool'); Error: The argument types do not match; the first argument is expected to be a String, but an Integer was passed instead.
(c) objSchool := TSchool.create('MySchool',745); Error: This will not produce an error if there is a proper constructor, but if there's a type mismatch, that would be the issue.
Step 8
Choose the appropriate method type to perform EACH of the following tasks:
Answer
(a) Change the number of learners from 1150 to 1200. Method Type: Mutator - as it modifies the state of the object.
(b) Calculate the ratio of the number of learners per teacher. Method Type: Accessor - as it retrieves data without modifying the object.