NSC Information Technology Algorithm design: 5.1 Binary and hexadecimal syste

Question

5.1 Binary and hexadecimal systems are two number systems used in computing.

5.1.1 What is the base number of the binary number system?  
5.1.2 Give ALL the digits/characters that the hexadecimal number system consists of.

5.2 Arrays are frequently used to store data in a program.

5.2.1 When does it become necessary to use an array instead of a variable?  
5.2.2 The names and ages of learners must be stored in an array.
arrData : array [1..30] of Integer;  
Motivate why the names and ages cannot be stored in the array provided.

5.2.3 You have been provided with the following array, called arrNum:

Values: 46  82  23  54  12  36  41  7  3  
Index:  1   2   3   4   5   6   7   8   9   10

Write an algorithm using a loop to insert an additional value of 92 at index position 6 in the arrNum array.
The contents of the array after the algorithm has been executed should be as follows:

Values: 46  82  23  54  92  12  36  41  7  3  
Index:  1   2   3   4   5   6   7   8   9   10

5.3 OOP is the abbreviation for object-oriented programming.

5.3.1 State whether the following statements are TRUE or FALSE:
(a) A toString method is used to change the value of an attribute to a string for display purposes.
(b) It is possible to instantiate an object without writing/creating your own constructor method for the object class.
(c) The number of parameters received in a constructor must be equal to the number of attributes of the object class.

5.3.2 Differentiate between an accessor method and a mutator method.

5.4 Prime numbers are numbers with only two factors.

A factor is a number that divides into another number without a remainder.

The following pseudocode determines whether an input number is or not, and displays the outcome/result:

1  Input Number  
2  Factor ← 0  
3  For Loop ← 2 to Number  
4      If Number mod Loop = 0  
5          Factor ← Factor + 1  
6      If Factor = 1  
7          Output Number + ' is a prime number'  
8      Else  
9          Output Number + ' is NOT a prime number'

Draw the trace table below in the ANSWER BOOK. Complete the trace table for the code provided above if the value of 4 is entered for Number.

5.1 Binary and hexadecimal systems are two number systems used in computing - NSC Information Technology - Question 5 - 2022 - Paper 2

Worked Solution & Example Answer:5.1 Binary and hexadecimal systems are two number systems used in computing - NSC Information Technology - Question 5 - 2022 - Paper 2

5.1.1 What is the base number of the binary number system?

5.1.2 Give ALL the digits/characters that the hexadecimal number system consists of.

5.2.1 When does it become necessary to use an array instead of a variable?

5.2.2 Motivate why the names and ages cannot be stored in the array provided.

5.2.3 Write an algorithm using a loop to insert an additional value of 92 at index position 6 in the arrNum array.

5.3.1 State whether the following statements are TRUE or FALSE: (a) A toString method is used to change the value of an attribute to a string for display purposes.

5.3.1 State whether the following statements are TRUE or FALSE: (b) It is possible to instantiate an object without writing/creating your own constructor method for the object class.

5.3.1 State whether the following statements are TRUE or FALSE: (c) The number of parameters received in a constructor must be equal to the number of attributes of the object class.

5.3.2 Differentiate between an accessor method and a mutator method.

5.4 Draw the trace table below in the ANSWER BOOK. Complete the trace table for the code provided above if the value of 4 is entered for Number.

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