Variables & Data Types — GCSE Computer Science Revision
Revise Variables & Data Types for GCSE Computer Science. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
At a glance
- What StudyVector is
- An exam-practice platform with board-aligned questions, explanations, and adaptive next steps.
- This topic
- Variables & Data Types in GCSE Computer Science: explanation, examples, and practice links on this page.
- Who it’s for
- Students revising GCSE Computer Science for UK exams.
- Exam boards
- Practice is aligned to major specifications (AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP).
- Free plan
- Sign up free to use tutor paths and feedback on your answers. Free access is 3 days uncapped, then 30 min practice/day. Pricing
- What makes it different
- Syllabus-shaped practice and progress tracking—not generic AI answers.
Topic has curated content entry with explanation, mistakes, and worked example. [auto-gate:promote; score=70.6]
Next in this topic area
Next step: Sequence, Selection & Iteration
Continue in the same course — structured practice and explanations on StudyVector.
Go to Sequence, Selection & IterationWhat is Variables & Data Types?
Variables are named memory locations used to store data that can change while a program is running. Each variable has a data type, which tells the computer what kind of data it can hold, such as an integer (whole number), a float (decimal number), a string (text), or a Boolean (True/False). Using the correct data type is crucial for writing efficient and error-free code.
Board notes: This is an absolute fundamental for all programming components of the AQA, Edexcel, and OCR specifications. You must know the common data types (Integer, Real/Float, String, Character, Boolean) and how to use them in the specified language.
Step-by-step explanationWorked example
In Python, to store a user's age: `userAge = 15`. Here, `userAge` is the variable name, and the value `15` is an integer. To store their name: `userName = "Alex"`. Here, `userName` is the variable, and `"Alex"` is a string. If we wanted to calculate their age next year, we could write `ageNextYear = userAge + 1`.
Practise this topic
Jump into adaptive, exam-style questions for Variables & Data Types. Free to start; sign in to save progress.
Common mistakes
- 1Choosing the wrong data type, for example, storing a price like £9.99 as an integer instead of a float, which would lose the decimal part.
- 2Trying to perform operations on incompatible data types, like trying to mathematically add a string to a number without converting it first.
- 3Using unclear variable names like `x` or `temp`. Good variable names like `userAge` or `totalScore` make code much easier to read and understand.
Variables & Data Types exam questions
Exam-style questions for Variables & Data Types with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
Variables & Data Types exam questionsGet help with Variables & Data Types
Get a personalised explanation for Variables & Data Types from the StudyVector tutor. Ask follow-up questions and work through problems with step-by-step support.
Open tutorFree full access to Variables & Data Types
Sign up in 30 seconds to unlock step-by-step explanations, exam-style practice, instant feedback and on-demand coaching — completely free, no card required.
Try a practice question
Unlock Variables & Data Types practice questions
Get instant feedback, step-by-step help and exam-style practice — free, no card needed.
Start Free — No Card NeededAlready have an account? Log in
Step-by-step method
Step-by-step explanation
4 steps · Worked method for Variables & Data Types
Core concept
Variables are named memory locations used to store data that can change while a program is running. Each variable has a data type, which tells the computer what kind of data it can hold, such as an in…
Frequently asked questions
What is the difference between a variable and a constant?
A variable is a value that is expected to change during the program's execution. A constant is a value that, once assigned, should not be changed. Using constants for fixed values like the rate of VAT makes code more reliable.
What is casting in programming?
Casting is the process of converting a variable from one data type to another. For example, if you get a number as input from a user, it is often read as a string, so you need to cast it to an integer or float before you can use it in calculations.