String Handling — GCSE Computer Science Revision
Revise String Handling 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 File HandlingWhat is String Handling?
String handling, or string manipulation, involves processing and transforming strings of text. Common operations include finding the length of a string, extracting a substring from a specific position, concatenating (joining) strings together, and changing the case of characters. These are fundamental skills for any program that deals with textual data.
Board notes: AQA, Edexcel, and OCR all require string manipulation skills. You should be able to perform common operations like concatenation, slicing (extracting substrings), and using the length function in the specified exam language.
Step-by-step explanationWorked example
Given the string `fullName = "John Smith"`. To get the user's initials: `initial1 = fullName[0]` (which gives 'J'). To find the space, you could search for it. To get the surname, you would take a substring from the character after the space to the end of the string. For example, in Python: `surname = fullName[5:10]` which would give `"Smith"`.
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Common mistakes
- 1Forgetting that string indices start at 0, just like with lists. The first character is at index 0.
- 2Confusing string concatenation with adding numbers. `"5" + "2"` results in the string `"52"`, not the number 7.
- 3Making 'off-by-one' errors when extracting substrings, for example, getting the start or end position wrong by one character.
String Handling exam questions
Exam-style questions for String Handling 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 String Handling
Core concept
String handling, or string manipulation, involves processing and transforming strings of text. Common operations include finding the length of a string, extracting a substring from a specific position…
Frequently asked questions
How do you get the length of a string?
Most programming languages provide a built-in function to get the length of a string. In Python, for example, you would use `len(my_string)`.
What is a substring?
A substring is a smaller portion of a larger string. For example, 'World' is a substring of 'Hello World'.