5.1 Binary and hexadecimal systems are two number systems used in computing - NSC Information Technology - Question 5 - 2022 - Paper 2
Question 5
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/cha... show full transcript
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
Step 1
What is the base number of the binary number system?
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Answer
The base number of the binary number system is 2.
Step 2
Give ALL the digits/characters that the hexadecimal number system consists of.
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Answer
The hexadecimal number system consists of the digits 0-9 and the letters A-F.
Step 3
When does it become necessary to use an array instead of a variable?
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Answer
It becomes necessary to use an array instead of a variable when working with a large number of values, as an array can store multiple values, while a variable can only hold one value.
Step 4
Motivate why the names and ages cannot be stored in the array provided.
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Answer
The names and ages cannot be stored in the provided array because an array can only store values of one specific data type. In this case, names are strings and ages are integers, thus requiring different data types.
Step 5
Write an algorithm using a loop to insert an additional value of 92 at index position 6 in the arrNum array.
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Answer
Loop k from 10 down to 6
arrNum[k] ← arrNum[k-1]
arrNum[6] ← 92
Step 6
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.
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Answer
FALSE
Step 7
(b) It is possible to instantiate an object without writing/creating your own constructor method for the object class.
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Answer
TRUE
Step 8
(c) The number of parameters received in a constructor must be equal to the number of attributes of the object class.
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Answer
FALSE
Step 9
Differentiate between an accessor method and a mutator method.
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Answer
An accessor method returns the value of an attribute of an object, whereas a mutator method changes the value of an attribute of an object.
Step 10
Complete the trace table for the code provided above if the value of 4 is entered for Number.
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