Data type keywords: INTEGER, REAL, CHAR, STRING, BOOLEAN
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which data type should a variable holding a student's age in whole years use?
2. Which data type suits a price such as 4.75?
3. Which data type is best for a phone number such as 07911123456?
4. Which data type holds exactly one letter, such as a grade 'B'?
5. Which data type suits a postcode such as SW1A 2AA?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1DECLARE Age : INTEGER | ADECLARE PhoneNumber : STRING | |
| 2DECLARE Grade : CHAR | BDECLARE Price : REAL | |
| 3A phone number or postcode must be stored as a STRING, because it can start with 0 and is never used in sums. | CAge can hold only whole numbers, such as 15 or 42, with no fractional part. | |
| 4A price such as 3.75 has a fractional part, so it needs the REAL data type, not INTEGER. | DA value that is only TRUE or FALSE should use the BOOLEAN data type, not STRING. | |
| 5DECLARE Postcode : INTEGER | EA postcode can start with 0 or contain letters, and you never do sums with it. It should be a STRING, not an INTEGER. | |
| 6DECLARE IsLoggedIn : STRING | FGrade holds exactly one character, such as 'A'. |
C
Definitions
INTEGER, REAL, CHAR, STRING, BOOLEAN
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
DECLARE Age : _______
2.
DECLARE Price : ____
3.
DECLARE Grade : ____
4.
DECLARE PhoneNumber : ______
5.
DECLARE IsValid : _______
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
DECLARE Age : INTEGER
B
DECLARE Price : REAL
C
Price ← 2.50
D
Age ← 15.5
Question 2
A
DECLARE Initial : CHARACTER
B
Initial ← 'K'
C
OUTPUT Initial
Question 3
A
// Store a phone number
B
DECLARE Name : STRING
C
INPUT Name
D
DECLARE Phone : INTEGER
E
INPUT Phone
Question 4
A
DECLARE Passed : BOOLEAN
B
Passed ← "TRUE"
C
IF Passed = TRUE THEN
D
OUTPUT "Well done"
E
ENDIF
Question 5
A
DECLARE Count : INTEGER
B
DECLARE Height REAL
C
Height ← 1.75
Answer Key
Data type keywords: INTEGER, REAL, CHAR, STRING, BOOLEAN
Section A: Quick Questions
Q1
B — INTEGER
Q2
A — REAL
Q3
B — STRING
Q4
A — CHAR
Q5
A — STRING
Section B: Match the Pairs
Q1
DECLARE Age : INTEGER → Age can hold only whole numbers, such as 15 or 42, with no fractional part.
Q2
DECLARE Grade : CHAR → Grade holds exactly one character, such as 'A'.
Q3
A phone number or postcode must be stored as a STRING, because it can start with 0 and is never used in sums. → DECLARE PhoneNumber : STRING
Q4
A price such as 3.75 has a fractional part, so it needs the REAL data type, not INTEGER. → DECLARE Price : REAL
Q5
DECLARE Postcode : INTEGER → A postcode can start with 0 or contain letters, and you never do sums with it. It should be a STRING, not an INTEGER.
Q6
DECLARE IsLoggedIn : STRING → A value that is only TRUE or FALSE should use the BOOLEAN data type, not STRING.
Section C: Definitions
Q1
INTEGER, REAL, CHAR, STRING, BOOLEAN — The five data types, in order: whole number, number with a fractional part, one character, zero or more characters, TRUE or FALSE. A phone number is a STRING.Section D: Fill in the Blanks
Q1
DECLARE Age : INTEGERQ2
DECLARE Price : REALQ3
DECLARE Grade : CHARQ4
DECLARE PhoneNumber : STRINGQ5
DECLARE IsValid : BOOLEANSection E: Spot the Error
Q1
D — Age is an INTEGER, so it can only hold a whole number. 15.5 has a fractional part. It should be a whole number such as 15, or Age should be declared as REAL.
Q2
A — The Cambridge keyword for a single character is CHAR, not CHARACTER. It should be DECLARE Initial : CHAR.
Q3
D — A phone number is not used for calculations and often starts with 0, which an INTEGER would drop. It must be a STRING, so: DECLARE Phone : STRING.
Q4
B — A BOOLEAN holds the value TRUE or FALSE, written without quotes. "TRUE" in quotes is a STRING. It should be Passed ← TRUE.
Q5
B — A declaration needs a colon between the identifier and the data type. It should be DECLARE Height : REAL.