Table 1
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. [5]
Tap/click to reveal
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)
Which of the following can be changed as a program runs? [1]
(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
Tap/click to reveal (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? [3]
Tap/click to reveal
15 ✓
8 ✓
"hu, 1 J" ✓
What is the output of
NOT(5 ≥ 9
OR 4 > 7)
XOR (6 ≠ 2
AND 8 < 1)
? [1]
Tap/click to reveal
True ✓
Give two reasons why a developer might want to include random number in their game. [2]
Tap/click to reveal
Any two from:
- 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] ✓
Why would a 2D array be used to store the top three athletes in each event at a sports day? [1]
Tap/click to reveal Because the data is split by two categories: in each event there is a list of three athletes to store. ✓