NSC Information Technology Object-oriented programming: The group of IT friends are writ

Question

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 repeat … instructions to be executed until k = 1 5.1.2 k< 0 while k >= 0 begin …instructions to be executed increment k end 5.2 Each user will log onto the system and an object called User will be instantiated with the following layout: Fields - Name:string - Surname:string - ContactDetails:string - LoginTime:DateTime - LogoutTime:DateTime Methods + constructor create() + GetName() + GetSurname() + SetLoginTime(LoginTime) + SetLogoutTime(LogoutTime) + CalculateCost(LogoutTime) 5.2.1 What does it mean to instantiate an object? 5.2.2 Explain the purpose of: (a) An accessor method (b) A mutator method 5.2.3 The cost to use an Internet connection is R3,00 per minute. The login and logout time is entered using the 24-hour clock system. For example, the login time is entered as 15:25 and the logout time as 16:05. Write an algorithm for the CalculateCost(LogoutTime) method in pseudocode to determine the cost for the amount of time that the user was logged onto the Internet. 5.3 For one of the games on the computer the user must enter any integer value between 0 and 100. The computer must generate random numbers until the generated number is the same as the one the user entered. The number of values that were randomly generated must be displayed. An algorithm to solve this problem is given below: 1 Enter number (for example user enters the number 40) 2 Found ← false 3 While not found do 4 randomNum ← Generate a random number in the range 0 to 100 5 If randomNum <> number then 6 Increment Counter 7 Else 8 Found ← true 9 End of loop 10 Display the Counter value This algorithm contains errors. Copy and complete the trace table to indicate the line numbers where the errors occur. Indicate how the errors can be corrected. Found Is Found true? randomNum = number? Counter Display False No/False 5 No xxxxx 40 Yes xxxxx

The group of IT friends are writing customised programs for their business - NSC Information Technology - Question 5 - 2016 - Paper 2

Worked Solution & Example Answer:The group of IT friends are writing customised programs for their business - NSC Information Technology - Question 5 - 2016 - Paper 2

5.1.1 k < 1

5.1.2 k < 0

5.2.1 What does it mean to instantiate an object?

5.2.2 (a) An accessor method

5.2.2 (b) A mutator method

5.2.3 Write an algorithm for the CalculateCost(LogoutTime)

5.3 Copy and complete the trace table

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