Declaring a variable with DECLARE (8.1b)
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line correctly declares a whole-number variable called Count?
2. Which line correctly declares a variable to store a price such as 4.50?
3. True or false: DECLARE gives a variable its name and data type before the variable is used.
4. Which identifier is written correctly in Cambridge pseudocode?
5. Which declaration is the correct one for a variable that stores a person's name?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1DECLARE Count : INTEGER | AThe identifier contains a space. Identifiers must be one word with no spaces, e.g. TotalPrice. | |
| 2DECLARE Found : BOOLEAN | BDECLARE Name : STRING | |
| 3Declare a variable to store a price with a decimal point, such as 4.99 | CCreates a variable called Count that can only store whole numbers | |
| 4Declare a variable to store text such as a person's name | DThe colon is missing between the identifier and the data type. It should be DECLARE Count : INTEGER. | |
| 5DECLARE Total Price : REAL | ECreates a variable called Found that can only store TRUE or FALSE | |
| 6DECLARE Count INTEGER | FDECLARE Price : REAL |
C
Definitions
DECLARE Count : INTEGER
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
_______ Count : INTEGER
2.
DECLARE Price : ____
3.
DECLARE Name : ______
4.
DECLARE Found : _______
5.
DECLARE _____ : INTEGER
Total <- 0
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
DECLARE Total : INTEGER
B
DECLARE Price REAL
C
Price <- 4.5
D
Total <- 3
E
OUTPUT Total * Price
Question 2
A
DECLARE Name : STRING
B
DECLARE Age : INTEGER
C
Name <- "Sam"
D
Age <- "fifteen"
Question 3
A
DECLARE Count : INTEGER
B
DECLARE Found : BOOLEAN
C
Count <- 0
D
Found <- 0
Question 4
A
DECLARE Count : INTEGER
B
DECLARE Price : REAL
C
DECLARE Total Cost : REAL
D
TotalCost <- Count * Price
Question 5
A
DECLARE Total : INTEGER
B
DECLARE Count : INTEGER
C
DECLARE Average : INTEGER
D
Average <- Total / Count
Answer Key
Declaring a variable with DECLARE (8.1b)
Section A: Quick Questions
Q1
B — DECLARE Count : INTEGER
Q2
A — DECLARE Price : REAL
Q3
A — True
Q4
B — DECLARE TotalScore : INTEGER
Q5
A — DECLARE Name : STRING
Section B: Match the Pairs
Q1
DECLARE Count : INTEGER → Creates a variable called Count that can only store whole numbers
Q2
DECLARE Found : BOOLEAN → Creates a variable called Found that can only store TRUE or FALSE
Q3
Declare a variable to store a price with a decimal point, such as 4.99 → DECLARE Price : REAL
Q4
Declare a variable to store text such as a person's name → DECLARE Name : STRING
Q5
DECLARE Total Price : REAL → The identifier contains a space. Identifiers must be one word with no spaces, e.g. TotalPrice.
Q6
DECLARE Count INTEGER → The colon is missing between the identifier and the data type. It should be DECLARE Count : INTEGER.
Section C: Definitions
Q1
DECLARE Count : INTEGER — Names a variable (Count) and gives its data type (INTEGER) before use. Other types: REAL, STRING, BOOLEAN. Identifiers are capitalised with no spaces.Section D: Fill in the Blanks
Q1
DECLARE Count : INTEGERQ2
DECLARE Price : REALQ3
DECLARE Name : STRINGQ4
DECLARE Found : BOOLEANQ5
DECLARE Total : INTEGER
Total <- 0Section E: Spot the Error
Q1
B — The colon between the identifier and the data type is missing. It should be DECLARE Price : REAL.
Q2
D — Age was declared as INTEGER, so it cannot store text. It should be Age <- 15.
Q3
D — Found was declared as BOOLEAN, so it can only hold TRUE or FALSE, not a number. It should be Found <- FALSE.
Q4
C — An identifier cannot contain a space. It should be DECLARE TotalCost : REAL.
Q5
C — An average can have decimal places, so Average should be declared as REAL, not INTEGER. It should be DECLARE Average : REAL.