23L2 - Input Validation
In this lesson, we explore input validation and why it is essential for writing robust programs.
Programs often rely on user input, but real users make mistakes. They may enter text instead of numbers, leave fields blank, or type values that are outside the allowed range. In this video, you’ll learn how programs can check input before using it, helping them avoid crashes and incorrect results.
This lesson covers:
-What input validation is
-Why validation is needed in real programs
-How validation improves robustness
-Common types of validation:
type
range
length
presence
-How validation links back to selection (IF statements) from Topic 2.2
-How input validation appears in OCR Paper 2 exam questions
The lesson uses clear explanations, simple examples, and exam-focused thinking to help you prepare confidently for assessment.
✅ Perfect for:
-OCR GCSE Computer Science students
-Revision for Paper 2
-Understanding robustness and defensive design
-Teachers looking for structured, student-friendly explanations
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#GCSEComputerScience #OCRJ277 #RobustPrograms #InputValidation #ProgrammingFundamentals #GCSERevision #ComputerScienceGCSE #Paper2