CASE clauses with ranges and several statements

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which CASE clause correctly matches every whole number from 1 to 9?

A 1 TO 9 : OUTPUT "Low"

B 1 - 9 : OUTPUT "Low"

2. Which clause is a valid grade band for marks from 50 up to 69?

A 50 < Mark < 69 : Grade <- "B"

B 50 TO 69 : Grade <- "B"

3. Which pair of CASE clauses is written correctly for marks 0 to 100?

A 0 TO 49 : and 50 TO 100 :

B 0 TO 50 : and 50 TO 100 :

4. A clause has two indented statements under it. What happens when its range matches?

A Only the first statement runs

B Both indented statements run, in order

5. The clauses are 0 TO 49, 50 TO 74 and 75 TO 100. Mark is 75. Which clause runs?

A 75 TO 100

B 50 TO 74

Match the Pairs

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

Left column		Right column
11 TO 9 :		A0 TO 49 : 50 TO 100 :
270 TO 100 : grade <- "A" OUTPUT grade		BThe ranges overlap because 50 is in both 0 TO 50 and 50 TO 100. The first range should end at 49.
3A range clause for the grade band 50 to 69 that sets the grade to B		CA CASE clause that matches any value from 1 up to 9, including both 1 and 9
4Ranges in the same CASE must not overlap, so each mark belongs to only one band		D50 TO 69 : grade <- "B"
50 TO 50 : grade <- "F" 50 TO 100 : grade <- "P"		EA range must be written with the keyword TO, not a hyphen. It should be 1 TO 9 :
6CASE OF mark 1 - 9 : OUTPUT "Low" ENDCASE		FA range clause whose two indented statements both run when the value is between 70 and 100

Definitions

1 TO 9 :

Fill in the Blanks

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

CASE OF Score 0 __ 49 : OUTPUT "Fail" ENDCASE

CASE OF Mark 50 TO 69 : ______ "Merit" ENDCASE

CASE OF Mark 1 TO 9 : Total <- Total + Mark OUTPUT _____

0 TO 49 : Grade <- "F" __ TO 100 : Grade <- "P" ENDCASE

CASE OF Mark 1 TO 9 : OUTPUT "Low" _______

Spot the Error

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

Question 1

A CASE OF Mark

B 70 TO 100 : OUTPUT "A"

C 40 - 69 : OUTPUT "B"

D ENDCASE

Question 2

A CASE OF Score

B 1 TO 9 OUTPUT "Low"

C 10 TO 99 : OUTPUT "High"

D ENDCASE

Question 3

A CASE OF Mark

B 70 TO 100 :

C OUTPUT "Pass"

D Passes <- Pass + 1

E ENDCASE

Question 4

A CASE Mark

B 50 TO 100 : OUTPUT "Pass"

C OTHERWISE : OUTPUT "Fail"

D ENDCASE

Question 5

A CASE OF Age

B 0 TO 13 : OUTPUT "Child"

C 13 TO 19 : OUTPUT "Teen"

D ENDCASE

Answer Key

CASE clauses with ranges and several statements

Section A: Quick Questions

A — 1 TO 9 : OUTPUT "Low"

B — 50 TO 69 : Grade <- "B"

A — 0 TO 49 : and 50 TO 100 :

B — Both indented statements run, in order

A — 75 TO 100

Section B: Match the Pairs

1 TO 9 : → A CASE clause that matches any value from 1 up to 9, including both 1 and 9

70 TO 100 : grade <- "A" OUTPUT grade → A range clause whose two indented statements both run when the value is between 70 and 100

A range clause for the grade band 50 to 69 that sets the grade to B → 50 TO 69 : grade <- "B"

Ranges in the same CASE must not overlap, so each mark belongs to only one band → 0 TO 49 : 50 TO 100 :

0 TO 50 : grade <- "F" 50 TO 100 : grade <- "P" → The ranges overlap because 50 is in both 0 TO 50 and 50 TO 100. The first range should end at 49.

CASE OF mark 1 - 9 : OUTPUT "Low" ENDCASE → A range must be written with the keyword TO, not a hyphen. It should be 1 TO 9 :

Section C: Definitions

1 TO 9 : — In a CASE clause, value1 TO value2 matches a whole range, such as 1 TO 9. Indented statements under the clause all run. Ranges in one CASE must not overlap.

Section D: Fill in the Blanks

CASE OF Score
   0 TO 49 : OUTPUT "Fail"
ENDCASE

CASE OF Mark
   50 TO 69 : OUTPUT "Merit"
ENDCASE

CASE OF Mark
   1 TO 9 : Total <- Total + Mark
           OUTPUT Total

   0 TO 49 : Grade <- "F"
   50 TO 100 : Grade <- "P"
ENDCASE

CASE OF Mark
   1 TO 9 : OUTPUT "Low"
ENDCASE

Section E: Spot the Error

C — A range in a CASE clause is written with TO, not a hyphen. It should be 40 TO 69 : OUTPUT "B".

B — The colon is missing after the range. A clause must be written 1 TO 9 : OUTPUT "Low".

D — The statement must add 1 to the same variable it assigns to. Pass is a different, undeclared variable. It should be Passes <- Passes + 1.

A — The CASE statement must start with CASE OF followed by the variable. The word OF is missing, so it should be CASE OF Mark.

B — Ranges in one CASE must not overlap. 0 TO 13 includes 13, which is also in 13 TO 19. It should be 0 TO 12.