GCSE AQA Computer Science Programming Fundamentals & Data Types: Figure 5 shows an algorithm repr

Question

Figure 5 shows an algorithm represented using pseudo-code.

The algorithm is for a simple authentication routine.

The pseudo-code uses a subroutine getPassword to check a username:

If the username exists, the subroutine returns the password for that user.
If the username does not exist, the subroutine returns an empty string.

Parts of the algorithm are missing and have been replaced with the labels L1 to L4.

Figure 5

login ← False
REPEAT
    username ← ''
    WHILE username = ''
        OUTPUT 'Enter username:'
        username ← USERINPUT
    ENDWHILE
    password ← ''
    WHILE password = ''
        OUTPUT 'Enter password: '
        password ← USERINPUT
    ENDWHILE
    storedPassword ← getPassword(username)
    IF storedPassword = '' THEN
        OUTPUT 'User not found'
    ELSE
        IF password = storedPassword THEN
            login ← True
        ELSE
            OUTPUT 'Try again.'
        ENDIF
    UNTIL login = True
    OUTPUT 'You are now logged in.'

Figure 5 shows an algorithm represented using pseudo-code - AQA - GCSE Computer Science - Question 6 - 2023 - Paper 1

Worked Solution & Example Answer:Figure 5 shows an algorithm represented using pseudo-code - AQA - GCSE Computer Science - Question 6 - 2023 - Paper 1

L1

L2

L3

L4

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