BOOLEAN data type
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which declaration correctly creates a variable that stores yes/no information?
2. How many different values can a BOOLEAN variable hold?
3. Which line assigns a BOOLEAN value correctly?
4. Which statement about TRUE and FALSE is correct?
5. Which piece of information is best stored in a BOOLEAN variable?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1DECLARE GameOver : BOOLEAN | ATRUE is in quotes, so it is a STRING and not a BOOLEAN value. It should be GameOver ← TRUE | |
| 2GameOver ← TRUE | BDECLARE LevelComplete : BOOLEAN | |
| 3A BOOLEAN variable can hold yes/no information, such as whether a player has finished the level | CYES is not a BOOLEAN value. A BOOLEAN can only be TRUE or FALSE, so use GameOver ← TRUE | |
| 4TRUE and FALSE are keywords, so they are written without quotes when assigned | DCreates a variable called GameOver that can only store TRUE or FALSE | |
| 5GameOver ← "TRUE" | EGameOver ← FALSE | |
| 6GameOver ← YES | FStores the BOOLEAN value TRUE in GameOver, for example to show the game has ended |
C
Definitions
BOOLEAN
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
DECLARE GameOver : _______
2.
GameOver ← _____
3.
_______ IsRaining : BOOLEAN
4.
IF Lives = 0 THEN
GameOver ← ____
ENDIF
5.
DECLARE LoggedIn : BOOLEAN
LoggedIn ← TRUE
OUTPUT ________
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
DECLARE GameOver : BOOLEAN
B
GameOver ← "FALSE"
C
IF GameOver = TRUE THEN
D
OUTPUT "Game over"
E
ENDIF
Question 2
A
DECLARE Passed : BOOLEAN
B
DECLARE Score : INTEGER
C
Score ← 72
D
Passed ← 1
E
OUTPUT Passed
Question 3
A
DECLARE IsOpen : BOOLEAN
B
IsOpen ← TRUE
C
IF IsOpen = "TRUE" THEN
D
OUTPUT "Open"
E
ENDIF
Question 4
A
DECLARE Lives : INTEGER
B
DECLARE Alive : BOOLEAN
C
Alive ← Lives
D
OUTPUT Alive
Question 5
A
DECLARE Done : BOOLEAN
B
Done = FALSE
C
OUTPUT Done
Answer Key
BOOLEAN data type
Section A: Quick Questions
Q1
B — DECLARE GameOver : BOOLEAN
Q2
A — Two: TRUE and FALSE
Q3
A — GameOver ← TRUE
Q4
B — They are keywords, not strings
Q5
A — Whether the player has won (yes or no)
Section B: Match the Pairs
Q1
DECLARE GameOver : BOOLEAN → Creates a variable called GameOver that can only store TRUE or FALSE
Q2
GameOver ← TRUE → Stores the BOOLEAN value TRUE in GameOver, for example to show the game has ended
Q3
A BOOLEAN variable can hold yes/no information, such as whether a player has finished the level → DECLARE LevelComplete : BOOLEAN
Q4
TRUE and FALSE are keywords, so they are written without quotes when assigned → GameOver ← FALSE
Q5
GameOver ← "TRUE" → TRUE is in quotes, so it is a STRING and not a BOOLEAN value. It should be GameOver ← TRUE
Q6
GameOver ← YES → YES is not a BOOLEAN value. A BOOLEAN can only be TRUE or FALSE, so use GameOver ← TRUE
Section C: Definitions
Q1
BOOLEAN — A data type with only two possible values, TRUE or FALSE, written without quotes. Used for yes/no information, e.g. DECLARE GameOver : BOOLEANSection D: Fill in the Blanks
Q1
DECLARE GameOver : BOOLEANQ2
GameOver ← FALSEQ3
DECLARE IsRaining : BOOLEANQ4
IF Lives = 0 THEN
GameOver ← TRUE
ENDIFQ5
DECLARE LoggedIn : BOOLEAN
LoggedIn ← TRUE
OUTPUT LoggedInSection E: Spot the Error
Q1
B — FALSE is a keyword, not a string. With quotes it becomes a STRING, which cannot be stored in a BOOLEAN. It should be GameOver ← FALSE.
Q2
D — A BOOLEAN variable can only hold TRUE or FALSE. The number 1 is an INTEGER, so it must be Passed ← TRUE.
Q3
C — TRUE must be written without quotes. "TRUE" is a string, not a BOOLEAN value. It should be IF IsOpen = TRUE THEN.
Q4
C — Lives is an INTEGER, so it cannot be assigned to a BOOLEAN variable. Use a comparison that gives TRUE or FALSE, such as Alive ← Lives > 0.
Q5
B — Assignment uses the ← operator, not =. A line starting Done = FALSE is a comparison, not an assignment. It should be Done ← FALSE.