A length check is a type of validation check. State the purpose of a length check.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.

1. [1] To check that the data entered has the required number of characters.
2. [1] MP1 Initialisation of variables – start location for checking and flag, if used
3. [1] MP2 Input of email address into appropriate variable
4. [1] MP3 Working condition-controlled loop present
5. [1] MP4 Correct use of SUBSTRING
6. [1] MP5 Use of condition for checking value extracted from SUBSTRING / '@'
7. [1] MP6 Appropriate action if '@' found – loop termination
8. [1] MP7 Appropriate action if ' @ ' NOT found – check the next character and loop termination if no more characters
9. [1] MP8 Output that only shows when the email address is valid or invalid. Both cases required.
10. [6] Example: // Variable declarations are not required INPUT EmailAddress Start ← 1 Valid ← FALSE REPEAT IF SUBSTRING(EmailAddress, Start, 1) = '@' THEN Valid ← TRUE ELSE Start ← Start + 1 ENDIF UNTIL Start > LENGTH(EmailAddress) OR Valid IF Valid THEN OUTPUT EmailAddress, " is valid" ELSE OUTPUT EmailAddress, " is NOT valid" ENDIF