GCSE Computer Science Revision — String Handling
Revise String Handling for GCSE Computer Science with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What 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 examples
Worked 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"`.
Practise this topic
Start with low-focus cards for String Handling, then move into full exam-style practice when you want the heavier session.
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
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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'.