Selection: CASE

CASE chooses among values

• CASE OF compares one variable against several values.
• It is tidier than many IFs when each value gives a fixed result.
• The block ends at ENDCASE.

DECLARE Grade : INTEGER
Grade ← 2
CASE OF Grade
    1 : OUTPUT "Gold"
    2 : OUTPUT "Silver"
    3 : OUTPUT "Bronze"
ENDCASE

OTHERWISE catches the rest

• OTHERWISE runs when no value matched.
• Put it last, just before ENDCASE.

DECLARE Day : INTEGER
Day ← 1
CASE OF Day
    1 : OUTPUT "Monday"
    2 : OUTPUT "Tuesday"
    OTHERWISE OUTPUT "Another day"
ENDCASE

Watch out

• Each branch is written value : result. The colon : is required.
• CASE tests equality with set values — use IF for ranges like Mark >= 50.

Common mistakes

• CASE OF ... OTHERWISE ... ENDCASE; OTHERWISE catches the rest.
• Use CASE when you compare one variable against many values.

Now you try

• Read the input, then choose with CASE OF ... ENDCASE.
• Press Check answer to test it.