Declaring a variable with DECLARE (8.1a)

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Quick Questions

Shade in the A or B circle for each question.

1. Which line correctly declares a whole-number variable called Counter?

A DECLARE Counter : INTEGER

B DECLARE Counter = INTEGER

2. Which line declares a variable to store a price that can have pence, such as 12.75?

A DECLARE TotalToPay : INTEGER

B DECLARE TotalToPay : REAL

3. Which line declares a variable that stores TRUE or FALSE?

A DECLARE GameOver : STRING

B DECLARE GameOver : BOOLEAN

4. Which is the correct layout of a DECLARE statement in Cambridge pseudocode?

A DECLARE Counter : INTEGER

B DECLARE Counter: INTEGER

5. Which program declares the variable at the correct time?

A DECLARE Counter : INTEGER Counter ← 0

B Counter ← 0 DECLARE Counter : INTEGER

Match the Pairs

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

Left column		Right column
1DECLARE TotalToPay : REAL		ACreates a variable called TotalToPay that can hold numbers with decimal places, such as a price
2DECLARE GameOver : BOOLEAN		BCreates a variable called GameOver that can only hold TRUE or FALSE
3To create a variable that stores whole numbers, write DECLARE, then the name, a colon and the data type INTEGER		CThe colon is missing between the identifier and the data type. It should be DECLARE Counter : INTEGER
4A variable must be declared before it is used, so DECLARE comes on the line before the first assignment		DThe variable is used before it is declared. The DECLARE line must come before the assignment
5DECLARE Counter INTEGER		EDECLARE Score : INTEGER Score ← 0
6Total ← 0 DECLARE Total : INTEGER		FDECLARE Counter : INTEGER

Definitions

DECLARE Counter : INTEGER

Fill in the Blanks

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

_______ Counter : INTEGER

DECLARE TotalToPay : ____

DECLARE GameOver _ BOOLEAN

DECLARE Counter : _______ Counter ← 5

DECLARE Lives : INTEGER _____ ← 3 OUTPUT Lives

Spot the Error

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

Question 1

A // Game setup

B DECLARE Counter : INTEGER

C Counter ← 0

D DECLARE GameOver : BOOL

Question 2

A DECLARE Counter : INTEGER

B Counter ← 0

C DECLARE TotalToPay REAL

D TotalToPay ← 9.99

Question 3

A DECLARE Score : INTEGER

B DECLARE Price: REAL

C Score ← 10

Question 4

A DECLARE Lives : INTEGER

B DECLARE BOOLEAN : GameOver

C Lives ← 3

D GameOver ← FALSE

Question 5

A DECLARE Age : INTEGER

B DECLARE Height : REAL

C DEFINE Name : STRING

D Age ← 15

Answer Key

Declaring a variable with DECLARE (8.1a)

Section A: Quick Questions

A — DECLARE Counter : INTEGER

B — DECLARE TotalToPay : REAL

B — DECLARE GameOver : BOOLEAN

A — DECLARE Counter : INTEGER

A — DECLARE Counter : INTEGER Counter ← 0

Section B: Match the Pairs

DECLARE TotalToPay : REAL → Creates a variable called TotalToPay that can hold numbers with decimal places, such as a price

DECLARE GameOver : BOOLEAN → Creates a variable called GameOver that can only hold TRUE or FALSE

To create a variable that stores whole numbers, write DECLARE, then the name, a colon and the data type INTEGER → DECLARE Counter : INTEGER

A variable must be declared before it is used, so DECLARE comes on the line before the first assignment → DECLARE Score : INTEGER Score ← 0

DECLARE Counter INTEGER → The colon is missing between the identifier and the data type. It should be DECLARE Counter : INTEGER

Total ← 0 DECLARE Total : INTEGER → The variable is used before it is declared. The DECLARE line must come before the assignment

Section C: Definitions

DECLARE Counter : INTEGER — Creates a variable called Counter that can only hold whole numbers. Use DECLARE name : TYPE, with a space either side of the colon, before you use the variable.

Section D: Fill in the Blanks

DECLARE Counter : INTEGER

DECLARE TotalToPay : REAL

DECLARE GameOver : BOOLEAN

DECLARE Counter : INTEGER
Counter ← 5

DECLARE Lives : INTEGER
Lives ← 3
OUTPUT Lives

Section E: Spot the Error

D — BOOL is not a Cambridge pseudocode data type. The type must be written in full as BOOLEAN: DECLARE GameOver : BOOLEAN.

C — The colon is missing between the identifier and the data type. It should be DECLARE TotalToPay : REAL.

B — There must be a space on both sides of the colon. The line should be DECLARE Price : REAL.

B — The identifier and the data type are the wrong way round. The name comes first, then the colon, then the type: DECLARE GameOver : BOOLEAN.

C — DEFINE is not a pseudocode keyword. A variable is created with the keyword DECLARE: DECLARE Name : STRING.