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 U1 to U4.

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

U1

U2

U3

U4

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