Declaring a 1D array: DECLARE name : ARRAY[l:u] OF type

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Quick Questions

Shade in the A or B circle for each question.

1. Which line correctly declares a 1D array of 30 student names (indexes 1 to 30)?

A DECLARE StudentNames : ARRAY(1:30) OF STRING

B DECLARE StudentNames : ARRAY[1:30] OF STRING

2. In ARRAY[1:30], what separates the lower bound from the upper bound?

A A colon :

B A comma ,

3. After running DECLARE Scores : ARRAY[1:5] OF INTEGER, what values are stored in the array?

A None yet - the declaration only sets up the array

B Five zeros, one in each element

4. Which declaration puts the data type in the correct place?

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

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

5. For DECLARE StudentNames : ARRAY[1:30] OF STRING, what is the lower bound?

A 1

B 30

Match the Pairs

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

Left column		Right column
1DECLARE Marks : ARRAY[1:25] OF INTEGER		ADeclares a 1D array called Temps with indexes 0 to 6, so it has 7 elements, each holding a REAL number
2DECLARE Temps : ARRAY[0:6] OF REAL		BRound brackets are used instead of square brackets. The bounds must be written as [1:30].
3The bounds go inside square brackets with the lower bound first, then a colon, then the upper bound		CDeclares a 1D array called Marks with indexes 1 to 25, so it has 25 elements, each holding an INTEGER
4The declaration only sets up the array and its data type; it does not store any values, so a separate assignment is needed to fill an element		DThe word OF is missing before the data type. It should be ARRAY[1:20] OF INTEGER.
5DECLARE Names : ARRAY(1:30) OF STRING		EDECLARE Scores : ARRAY[1:10] OF INTEGER Scores[1] ← 15
6DECLARE Marks : ARRAY[1:20] INTEGER		FDECLARE Names : ARRAY[1:30] OF STRING

Definitions

DECLARE StudentNames : ARRAY[1:30] OF STRING

Fill in the Blanks

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

DECLARE StudentNames : ARRAY[1:30] OF ______

_______ Scores : ARRAY[1:10] OF INTEGER

DECLARE Marks : ARRAY[1_20] OF INTEGER

DECLARE Temperatures : ARRAY[0:6] __ REAL

// one element for each month DECLARE Rainfall : ARRAY[1:__] OF REAL

Spot the Error

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

Question 1

A DECLARE G : ARRAY[1:5] OF CHAR

B G[1] ← 'A'

C G[2] ← 'C'

D G[6] ← 'B'

Question 2

A // T = 7 daily temperatures

B DECLARE T : ARRAY[1,7] OF REAL

C T[1] ← 21.5

D T[2] ← 19.0

Question 3

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

B L[1] ← 'x'

C L(2) ← 'y'

D L[3] ← 'z'

Question 4

A DECLARE P : ARRAY[1:9] REAL

B P[1] ← 1.5

C P[2] ← 4.0

Question 5

A // F = 4 fruit initials

B DECLARE F : ARRAY[1:4] OF CHAR

C F[0] ← 'A'

D F[2] ← 'P'

Answer Key

Declaring a 1D array: DECLARE name : ARRAY[l:u] OF type

Section A: Quick Questions

B — DECLARE StudentNames : ARRAY[1:30] OF STRING

A — A colon :

A — None yet - the declaration only sets up the array

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

A — 1

Section B: Match the Pairs

DECLARE Marks : ARRAY[1:25] OF INTEGER → Declares a 1D array called Marks with indexes 1 to 25, so it has 25 elements, each holding an INTEGER

DECLARE Temps : ARRAY[0:6] OF REAL → Declares a 1D array called Temps with indexes 0 to 6, so it has 7 elements, each holding a REAL number

The bounds go inside square brackets with the lower bound first, then a colon, then the upper bound → DECLARE Names : ARRAY[1:30] OF STRING

The declaration only sets up the array and its data type; it does not store any values, so a separate assignment is needed to fill an element → DECLARE Scores : ARRAY[1:10] OF INTEGER Scores[1] ← 15

DECLARE Names : ARRAY(1:30) OF STRING → Round brackets are used instead of square brackets. The bounds must be written as [1:30].

DECLARE Marks : ARRAY[1:20] INTEGER → The word OF is missing before the data type. It should be ARRAY[1:20] OF INTEGER.

Section C: Definitions

DECLARE StudentNames : ARRAY[1:30] OF STRING — Declares a 1D array named StudentNames with indexes 1 to 30 (lower:upper), each element holding a STRING. It only sets up the array; no values are stored yet.

Section D: Fill in the Blanks

DECLARE StudentNames : ARRAY[1:30] OF STRING

DECLARE Scores : ARRAY[1:10] OF INTEGER

DECLARE Marks : ARRAY[1:20] OF INTEGER

DECLARE Temperatures : ARRAY[0:6] OF REAL

// one element for each month
DECLARE Rainfall : ARRAY[1:12] OF REAL

Section E: Spot the Error

D — The array was declared with indexes 1 to 5, so index 6 is above the upper bound and is out of range. The line should be G[5] ← 'B'.

B — The lower and upper bounds must be separated by a colon, not a comma. It should be ARRAY[1:7].

C — Array indexes use square brackets, not round brackets. The line should be L[2] ← 'y'.

A — The word OF is missing between the bounds and the data type. It should be DECLARE P : ARRAY[1:9] OF REAL.

C — The lower bound is 1, so index 0 does not exist in this array. The first element is F[1], so the line should be F[1] ← 'A'.