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Question 1 of ∞


Table 1 shows some the descriptions of five variables.

Table 1

Variable Data Type
Name  
Age  
Height (m)  
Phone number  
Employed?  

 

 Complete Table 1 by adding the most appropriate data types. Name:   String   (names are collections of characters) Age:   Integer   (an age is usually represented as a whole number) Height:   Float / Real   (height in metres is usually a number with a decimal part) Phone number:   String   (phone numbers start with a 0, which would not be possible to represent as an integer) Employed?:   Boolean   (there are only two possible options here: true or false)
  (a) The data type of a variable
  (b) The data type of a constant
  (c) The value of a variable
  (d) The value of a constant

 

 Which of the above can be changed as a program runs? (c) The value of a variable


Example 1 shows an algorithm written in pseudo-code.

Example 1
date ← "Thu, 1 Jan 1970"
OUTPUT LEN(date)
OUTPUT POSITION(date, 'a')
OUTPUT SUBSTRING(1, 7, date)

What is the output of Example 1? 15 8 "hu, 1 J"
What is the output of NOT(5 ≥ 9 OR 4 > 7) XOR (6 ≠ 2 AND 8 < 1)? True
Give two reasons why a developer might want to include random number in their game. So that the game is different every time it is played To simulate something that is random in real life So that the game is unpredictable and challenging [Other valid answers]
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Describe how a good test plan can help find logic errors. A good test plan will check most of the possible paths of the program It should test normal, boundary, and erroneous data If any of the outputs are not equal to the expected output, there is a logic error
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Explain how an interpreter works. The interpreter reads in the file statement by statement It calls machine code subroutines to carry out commands The interpreter stops if it finds a runtime error No machine code is outputted by the interpreter so the program needs to be translated each time it is executed