A program uses a CASE statement to convert a day number (1-7) to a day name and determine if it is a weekday or weekend. (a) Write pseudocode using a CASE s...

(a) The CASE statement maps each day number to a name, and a simple IF determines weekday vs. weekend. [5]

DECLARE DayNum : INTEGER
DECLARE DayName : STRING
DECLARE DayType : STRING

OUTPUT "Enter day number (1-7): "
INPUT DayNum

CASE OF DayNum
    1: DayName ← "Monday"
    2: DayName ← "Tuesday"
    3: DayName ← "Wednesday"
    4: DayName ← "Thursday"
    5: DayName ← "Friday"
    6: DayName ← "Saturday"
    7: DayName ← "Sunday"
    OTHERWISE: DayName ← "Invalid"
ENDCASE

IF DayNum >= 1 AND DayNum <= 5 THEN
    DayType ← "Weekday"
ELSE
    IF DayNum >= 6 AND DayNum <= 7 THEN
        DayType ← "Weekend"
    ELSE
        DayType ← "Invalid"
    ENDIF
ENDIF

OUTPUT DayName, " - ", DayType

[1 mark for CASE structure with all 7 days, 1 mark for OTHERWISE handling, 1 mark for weekday/weekend classification, 1 mark for handling invalid input, 1 mark for output]

(b) If the user enters 8, the OTHERWISE clause executes and DayName becomes "Invalid". The weekday/weekend IF also falls through to the outer ELSE, producing DayType = "Invalid". The output would be "Invalid - Invalid". [1]

(c) A CASE statement is more readable when there are many discrete values to test. Each value appears on its own labelled branch, so the structure reads like a lookup table. [1] With IF statements, seven comparisons would need nesting, making the code harder to follow and increasing the chance of logic errors when adding or reordering options. [1]