This deep dive covers Deep Dive: Validation Examples within Input Validation for GCSE Computer Science. Revise Input Validation in 3.2 Programming for GCSE Computer Science with 15 exam-style questions and 8 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 3 of 6 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Deep Dive: Validation Examples
// Range check
if age >= 0 AND age <= 120 then
accept input
endif
// Type check
if age.isInteger() then
accept input
endif
// Length check
if password.length >= 8 then
accept input
endif
// Presence check
if email != "" then
accept input
endif
// Format check (using pattern)
if postcode matches "LL## #LL" then
accept input
endifPractice questions for Input Validation
A program asks the user to enter a score between 1 and 10. Which validation check should be used to ensure the number is within this range?
A registration form collects a username. The username must: not be blank, contain only letters and numbers, and be between 6 and 20 characters long. Identify three validation checks and explain what each one does for this input.