INTEGER data type

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Quick Questions

Shade in the A or B circle for each question.

1. Which value can be stored in an INTEGER variable?

A -3

B 3.5

2. Which declaration creates a variable to store the number of lives a player has?

A DECLARE Lives : INTEGER

B DECLARE Lives : STRING

3. True or false: an INTEGER can be negative.

A False, it must be 0 or more

B True, for example -3

4. Which is a valid INTEGER literal?

A 42.0

B 42

5. Which value is best stored as an INTEGER?

A The number of students in a class

B The average height of the students in metres

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1DECLARE Lives : INTEGER		ACreates a variable called Lives that can store a whole number, such as the number of lives left in a game
2Score ← -3		BStores a negative whole number in the variable Score, which is a valid INTEGER value
3An INTEGER variable holds a whole number with no fractional part, such as a count of items		CCounter ← 5
4A valid INTEGER value is written in normal denary digits and can be positive or negative		D2.5 has a fractional part, so it cannot be stored in an INTEGER variable. Use a whole number such as 2, or declare Lives as REAL.
5DECLARE Lives : INTEGER Lives ← 2.5		EDECLARE Counter : INTEGER
6DECLARE Counter : INTEGER Counter ← "5"		F"5" is a STRING because it is in quotes, so it does not match INTEGER. Write the whole number 5 without quotes.

Definitions

INTEGER

Fill in the Blanks

Complete each line of code by filling in the missing parts.

DECLARE Lives : _______

DECLARE Change : _______ Change ← -3

_______ Counter : INTEGER Counter ← 0

DECLARE Lives : INTEGER _____ ← 3

DECLARE Counter : INTEGER Counter ← 0 Counter ← Counter _ 1

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A DECLARE Lives : INTEGER

B Lives ← 3

C Lives ← Lives - 0.5

D OUTPUT Lives

Question 2

A DECLARE Score : INTEGER

B Score ← 0

C Score ← Score + 10

D Score ← Score + 2.5

E OUTPUT Score

Question 3

A DECLARE Temp : INTEGER

B Temp ← "-3"

C OUTPUT Temp

Question 4

A DECLARE Count : INT

B Count ← 7

C OUTPUT Count

Question 5

A DECLARE Players : INTEGER

B Players ← 4.0

C OUTPUT Players

Answer Key

INTEGER data type

Section A: Quick Questions

A — -3

A — DECLARE Lives : INTEGER

B — True, for example -3

B — 42

A — The number of students in a class

Section B: Match the Pairs

DECLARE Lives : INTEGER → Creates a variable called Lives that can store a whole number, such as the number of lives left in a game

Score ← -3 → Stores a negative whole number in the variable Score, which is a valid INTEGER value

An INTEGER variable holds a whole number with no fractional part, such as a count of items → DECLARE Counter : INTEGER

A valid INTEGER value is written in normal denary digits and can be positive or negative → Counter ← 5

DECLARE Lives : INTEGER Lives ← 2.5 → 2.5 has a fractional part, so it cannot be stored in an INTEGER variable. Use a whole number such as 2, or declare Lives as REAL.

DECLARE Counter : INTEGER Counter ← "5" → "5" is a STRING because it is in quotes, so it does not match INTEGER. Write the whole number 5 without quotes.

Section C: Definitions

INTEGER — The data type for a whole number with no fractional part, written in denary digits, such as 5 or -3. Used for counts like lives: DECLARE Lives : INTEGER

Section D: Fill in the Blanks

DECLARE Lives : INTEGER

DECLARE Change : INTEGER
Change ← -3

DECLARE Counter : INTEGER
Counter ← 0

DECLARE Lives : INTEGER
Lives ← 3

DECLARE Counter : INTEGER
Counter ← 0
Counter ← Counter + 1

Section E: Spot the Error

C — Lives is an INTEGER, so it can only hold whole numbers. Subtracting 0.5 gives a value with a fractional part. It should subtract a whole number such as 1.

D — An INTEGER variable cannot store a number with a fractional part. 2.5 is a REAL value. It should add a whole number such as 5.

B — The quote marks make "-3" a STRING, not an INTEGER. A negative integer is written with a minus sign and digits only, with no quotes: Temp ← -3.

A — The Cambridge pseudocode data type for whole numbers is spelled INTEGER, not INT. It should be DECLARE Count : INTEGER.

B — 4.0 is written with a decimal point, so it is a REAL literal, not an INTEGER literal. A whole number is written with digits only: Players ← 4.