DECLARE and data types

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Quick Questions

Shade in the A or B circle for each question.

1. Which line correctly declares a variable to store a student's age in whole years?

A DECLARE Age : REAL

B DECLARE Age : INTEGER

2. Which line correctly declares a variable to store a price such as 4.99?

A DECLARE Price : REAL

B DECLARE Price : INTEGER

3. Which line correctly declares a variable to hold a player's name such as "Sam"?

A DECLARE PlayerName : STRING

B DECLARE PlayerName : CHAR

4. Which line correctly declares a variable to hold a single grade letter such as 'B'?

A DECLARE Grade : CHAR

B DECLARE Grade : STRING

5. Which line correctly declares a variable that stores either TRUE or FALSE?

A DECLARE IsPassed : INTEGER

B DECLARE IsPassed : BOOLEAN

Match the Pairs

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

Left column		Right column
1DECLARE Score : INTEGER		AThe identifier x is not meaningful, so it does not show what the variable stores. A name like Age or Score is better, for example DECLARE Age : INTEGER.
2DECLARE Grade : CHAR		BCreates a variable called Score that stores whole numbers only
3A variable that stores a number with a decimal part, such as a price		CCreates a variable called Grade that stores a single character such as 'A'
4A variable that stores only TRUE or FALSE, such as whether a number was found		DThe colon is missing between the identifier and the data type. It should be DECLARE Name : STRING.
5DECLARE Name STRING		EDECLARE Price : REAL
6DECLARE x : INTEGER		FDECLARE Found : BOOLEAN

Definitions

DECLARE Score : INTEGER

Fill in the Blanks

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

DECLARE Score : _______ Score ← 25

_______ Price : REAL Price ← 4.5

DECLARE Initial : ____ Initial ← 'A'

DECLARE IsPassed : _______ IsPassed ← TRUE

DECLARE ______ : REAL Height ← 1.75

Spot the Error

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

Question 1

A DECLARE Score : INTEGER

B DECLARE Name STRING

C Score ← 0

D Name ← "Ava"

Question 2

A DECLARE Age : INTEGER

B DECLARE Height : REAL

C Height ← "1.65"

D Age ← 15

Question 3

A DECLARE Grade : CHAR

B DECLARE Passed : BOOLEAN

C Grade ← 'BA'

D Passed ← TRUE

Question 4

A DECLARE Lives : NUMBER

B Lives ← 3

C OUTPUT Lives

Question 5

A DECLARE IsOpen : BOOLEAN

B DECLARE Count : INTEGER

C Count ← 0

D IsOpen ← "TRUE"

Answer Key

DECLARE and data types

Section A: Quick Questions

B — DECLARE Age : INTEGER

A — DECLARE Price : REAL

A — DECLARE PlayerName : STRING

A — DECLARE Grade : CHAR

B — DECLARE IsPassed : BOOLEAN

Section B: Match the Pairs

DECLARE Score : INTEGER → Creates a variable called Score that stores whole numbers only

DECLARE Grade : CHAR → Creates a variable called Grade that stores a single character such as 'A'

A variable that stores a number with a decimal part, such as a price → DECLARE Price : REAL

A variable that stores only TRUE or FALSE, such as whether a number was found → DECLARE Found : BOOLEAN

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

DECLARE x : INTEGER → The identifier x is not meaningful, so it does not show what the variable stores. A name like Age or Score is better, for example DECLARE Age : INTEGER.

Section C: Definitions

DECLARE Score : INTEGER — Creates a variable called Score with a stated data type. Types: INTEGER, REAL, STRING, CHAR, BOOLEAN. Pick a meaningful name.

Section D: Fill in the Blanks

DECLARE Score : INTEGER
Score ← 25

DECLARE Price : REAL
Price ← 4.5

DECLARE Initial : CHAR
Initial ← 'A'

DECLARE IsPassed : BOOLEAN
IsPassed ← TRUE

DECLARE Height : REAL
Height ← 1.75

Section E: Spot the Error

B — The colon is missing. A declaration must be written DECLARE Name : STRING, with a colon between the identifier and the data type.

C — Height is declared as REAL, so it must hold a number. Quotes make 1.65 a STRING. It should be Height ← 1.65.

C — A CHAR holds exactly one character. 'BA' has two characters, so it should be Grade ← 'B'. Use STRING for longer text.

A — NUMBER is not a Cambridge data type. A whole number such as Lives must be declared as INTEGER, or as REAL if it has decimals.

D — A BOOLEAN can only hold TRUE or FALSE, written without quotes. With quotes it becomes a STRING. It should be IsOpen ← TRUE.