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.
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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`.
Mini lesson for Variables & Data Types
1. Understand the core idea
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).
Can you explain Variables & Data Types without copying the notes?
2. Turn it into marks
In Python, to store a user's age: `userAge = 15`. Here, `userAge` is the variable name, and the value `15` is an integer.
Underline the method, evidence, or command-word move that would earn credit in GCSE Programming.
3. Fix the likely mark leak
Watch for this mistake: Choosing 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.
Write one correction rule before doing another practice question.
Practise this topic
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Variables & Data Types practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Variables & Data Types is testing.
Answer: 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).
Mark focus: Precise definition and topic focus.
Question 2
A student is revising Variables & Data Types. What should they do after reading the notes?
Answer: In Python, to store a user's age: `userAge = 15`. Here, `userAge` is the variable name, and the value `15` is an integer.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Choosing 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." What should their next repair task be?
Answer: Do one Variables & Data Types question and review the mistake type.
Mark focus: Error correction and next-step practice.
Variables & Data Types flashcards
Core idea
What is the main idea in 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 numb...
Common mistake
What mistake should you avoid in Variables & Data Types?
Choosing the wrong data type, for example, storing a price like £9.
Practice
What is one useful practice task for Variables & Data Types?
Answer one Variables & Data Types question and review the mistake type.
Exam board
How should you use board notes for Variables & Data Types?
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...
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.
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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.