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The group of IT friends are writing customised programs for their business - NSC Information Technology - Question 5 - 2016 - Paper 2
Question 5
The group of IT friends are writing customised programs for their business. 5.1 Indicate how many times each of the following loops will be executed: 5.1.1 k < 1 r... show full transcript
Worked Solution & Example Answer:The group of IT friends are writing customised programs for their business - NSC Information Technology - Question 5 - 2016 - Paper 2
Step 1
Step 2
5.1.2 k >= 0
Answer
The loop while k >= 0 begin … increment k end can potentially result in an infinite loop if k never becomes less than 0 because it continues to execute as long as k is greater than or equal to 0. This means that if k starts at a non-negative value and is never decremented, the loop will never terminate.
Step 3
5.2.1 What does it mean to instantiate an object?
Answer
To instantiate an object means to create a specific instance of a class in memory. When an object is instantiated, it allocates space in memory to store the attributes (fields) defined in the class and allows the user to interact with the object through its methods.
Step 4
5.2.2 Explain the purpose of:
Answer
(a) An accessor method is used to retrieve or access the value of a private attribute of the class without modifying it, ensuring encapsulation by preventing direct access to the private data.
(b) A mutator method allows the modification or updating of a variable's value, providing controlled access to change the state of an object's private attributes.
Step 5
5.2.3 Write an algorithm for the CalculateCost(LogoutTime) method in pseudocode.
Answer
- get login in minutes
- get logout minutes
- get login hour
- get logout hour
- calculate the number of hours
- calculate the number of minutes
- convert hours to minutes and add minutes
- cost = numberOfMinutes * 3
This pseudocode considers the hourly cost of internet connection based on the minutes calculated from the login and logout times.
Step 6
5.3
Answer
Found Is Found true? randomNum = number? Counter Display
First iteration: Line 2: Initial value of Found is false. Line 4: randomNum generates first random number. Line 5: Check if randomNum is not equal to number. If True, execute Line 6 to increment Counter.
Repeat until condition is met, checking each iteration.
Errors: Counter not initialised before use, and increment statement should be inside the iteration check.
Step 7
5.4
Answer
In this pseudocode segment, whenever the loop is executed, it outputs the value of 'output'. For each iteration:
- On iteration 1: output could be 1 or 0 based on the evaluated condition.
- On iteration 2: output is based on the same evaluation. The values displayed depend on the initial values of x, y, and z. The values of x, y, and z need to be defined for a correct output.