Strings and String Handling

What is Strings and String Handling?

Within Computer Science, which covers algorithms, programming, data, networks, hardware and safe, responsible use of technology, this topic explains Strings and String Handling. Computing topics explain how software, hardware and data work, with diagrams and models that show each step in order.

Check that you can explain Strings and String Handling in your own words and give one example from everyday life. If you can do that, you have understood the core idea.

Understanding Strings and String Handling helps you design, test and explain programs, websites and systems, from small projects to exam questions.

Strings and String Handling in detail

A string is a sequence of characters, such as text, enclosed in quotation marks. Common operations include finding the length, concatenation (joining strings), slicing or extracting substrings by position, searching for characters, changing case and replacing text.

Characters in a string can be accessed by index, and strings are often immutable, so operations produce new strings. Converting between strings and numbers is common, for example reading input. String handling is used in validating passwords, formatting output, processing text files and searching documents, and in checking for palindromes.

How the interactive helps you understand Strings and String Handling

Click a card to flip it and reveal the answer, then move on to the next one.

Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Strings and String Handling.

Real-life uses and examples

• Apply Strings and String Handling when you design a small program, website or spreadsheet.
• Explain Strings and String Handling to someone new to computing by comparing it to a familiar process.
• Trace through a process that uses Strings and String Handling to check what it does step by step.

Common mistakes to avoid

• Testing only the normal case and forgetting the edge cases.
• Using the term without being able to say what the computer actually does.
• Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.