Array data types: INTEGER, REAL, CHAR, STRING, BOOLEAN

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Quick Questions

Shade in the A or B circle for each question.

1. Which declaration suits ten whole-number test scores?

A DECLARE Scores : ARRAY[1:10] OF INTEGER

B DECLARE Scores : ARRAY[1:10] OF CHAR

2. Which declaration suits ten prices such as 2.50 and 7.99?

A DECLARE Prices : ARRAY[1:10] OF REAL

B DECLARE Prices : ARRAY[1:10] OF INTEGER

3. Which declaration can store the 26 letters of the alphabet, one letter per element?

A DECLARE Letters : ARRAY[1:26] OF CHAR

B DECLARE Letters : ARRAY[1:26] OF BOOLEAN

4. Which declaration suits 30 yes/no flags that record whether each student is present?

A DECLARE Present : ARRAY[1:30] OF REAL

B DECLARE Present : ARRAY[1:30] OF BOOLEAN

5. Which statement about the data type in ARRAY[1:10] OF INTEGER is true?

A Each element can have a different data type

B Every element must be an INTEGER

Match the Pairs

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

Left column		Right column
1DECLARE Prices : ARRAY[1:10] OF REAL		AAn array of ten elements, each of which can hold a number with a decimal part, such as 2.50
2DECLARE Flags : ARRAY[1:30] OF BOOLEAN		BDECLARE Letters : ARRAY[1:26] OF CHAR
3The array must store ten whole-number test scores, so the element data type is INTEGER		CAn array of thirty elements, each of which can only hold TRUE or FALSE
4The array must store the 26 letters of the alphabet, one single character in each element		DDECLARE Scores : ARRAY[1:10] OF INTEGER
5DECLARE Prices : ARRAY[1:10] OF INTEGER Prices[1] ← 2.50		EA BOOLEAN element can only hold TRUE or FALSE. The text "Yes" is a string, so it does not match the element data type. It should be Flags[1] ← TRUE.
6DECLARE Flags : ARRAY[1:30] OF BOOLEAN Flags[1] ← "Yes"		FThe array is declared OF INTEGER, so its elements can only hold whole numbers. The decimal 2.50 does not fit. The type after OF should be REAL.

Definitions

ARRAY[1:10] OF INTEGER

Fill in the Blanks

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

DECLARE Scores : ARRAY[1:10] OF _______

DECLARE Prices : ARRAY[1:10] OF ____

DECLARE Letters : ARRAY[1:26] OF ____

DECLARE Present : ARRAY[1:30] OF _______

DECLARE Names : ARRAY[1:30] OF ______ Names[1] ← "Ava"

Spot the Error

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

Question 1

A DECLARE L : ARRAY[1:3] OF TEXT

B L[1] ← 'A'

C OUTPUT L[1]

Question 2

A DECLARE P : ARRAY[1:3] OF REAL

B P[1] ← 2.50

C P[2] ← 1.75

D P[3] ← "cheap"

Question 3

A DECLARE L : ARRAY[1:3] OF CHAR

B L[1] ← 'AB'

C L[2] ← 'B'

D OUTPUT L[1]

Question 4

A // F: ARRAY[1:30] OF BOOLEAN

B F[1] ← TRUE

C F[2] ← FALSE

D F[3] ← 1

Question 5

A // N: ARRAY[1:5] OF STRING

B N[1] ← 42

C N[2] ← "Liam"

D OUTPUT N[1]

Answer Key

Array data types: INTEGER, REAL, CHAR, STRING, BOOLEAN

Section A: Quick Questions

A — DECLARE Scores : ARRAY[1:10] OF INTEGER

A — DECLARE Prices : ARRAY[1:10] OF REAL

A — DECLARE Letters : ARRAY[1:26] OF CHAR

B — DECLARE Present : ARRAY[1:30] OF BOOLEAN

B — Every element must be an INTEGER

Section B: Match the Pairs

DECLARE Prices : ARRAY[1:10] OF REAL → An array of ten elements, each of which can hold a number with a decimal part, such as 2.50

DECLARE Flags : ARRAY[1:30] OF BOOLEAN → An array of thirty elements, each of which can only hold TRUE or FALSE

The array must store ten whole-number test scores, so the element data type is INTEGER → DECLARE Scores : ARRAY[1:10] OF INTEGER

The array must store the 26 letters of the alphabet, one single character in each element → DECLARE Letters : ARRAY[1:26] OF CHAR

DECLARE Prices : ARRAY[1:10] OF INTEGER Prices[1] ← 2.50 → The array is declared OF INTEGER, so its elements can only hold whole numbers. The decimal 2.50 does not fit. The type after OF should be REAL.

DECLARE Flags : ARRAY[1:30] OF BOOLEAN Flags[1] ← "Yes" → A BOOLEAN element can only hold TRUE or FALSE. The text "Yes" is a string, so it does not match the element data type. It should be Flags[1] ← TRUE.

Section C: Definitions

ARRAY[1:10] OF INTEGER — The data type after OF decides what every element can hold. ARRAY[1:10] OF INTEGER holds ten whole-number scores; REAL, CHAR, STRING or BOOLEAN would hold other kinds of data.

Section D: Fill in the Blanks

DECLARE Scores : ARRAY[1:10] OF INTEGER

DECLARE Prices : ARRAY[1:10] OF REAL

DECLARE Letters : ARRAY[1:26] OF CHAR

DECLARE Present : ARRAY[1:30] OF BOOLEAN

DECLARE Names : ARRAY[1:30] OF STRING
Names[1] ← "Ava"

Section E: Spot the Error

A — TEXT is not a data type after OF. An array of single letters is declared with CHAR: DECLARE L : ARRAY[1:3] OF CHAR.

D — The array is OF REAL, so every element must hold a number with a decimal part. The text "cheap" cannot be stored. It should be P[3] ← 3.20.

B — A CHAR element holds exactly one character. 'AB' is two characters, so it should be L[1] ← 'A'.

D — A BOOLEAN array can only hold TRUE or FALSE. The number 1 is an INTEGER, so it should be F[3] ← TRUE.

B — The array is OF STRING, so each element holds text in double quotes. 42 is an INTEGER, so it should be N[1] ← "Ava".