Strings as Character Sequences in C++
Declared in <string>, std::string stores a variable-length, contiguous sequence of char elements and manages its storage automatically.
Summary
Declared in <string>, std::string stores a variable-length, contiguous sequence of char elements and manages its storage automatically. Each element represents a code unit, not necessarily a complete Unicode character. In UTF-8, a displayed character may occupy multiple char elements, so indexing by byte is not reliable character-wise processing.
For a string s of size , valid element indices satisfy . A nonempty string begins at index and ends at index . s.size() counts char elements but excludes the automatically maintained trailing null character. s.empty() reports whether the string contains no elements. s.at(i) checks the index and throws std::out_of_range when it is invalid.
🧠 Key Concepts
- Contiguous storage
- Code units
- Zero based indexing
- String size
- Checked access
- String concatenation
- Line input
- Null termination
- Search sentinel
- Automatic storage management
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Strings as Character Sequences in C++
📘 Overview A C++ std::string is a variable-length sequence of char elements stored contiguously. Each element represents a code unit, not necessarily a complete Unicode character.
🧠 Key Idea A string is an ordered sequence whose elements can be accessed and modified by position. Distinguishing valid character positions from the terminating null character prevents common indexing and length errors.
⚔️ Core Details: - std::string, declared in <string>, manages its storage automatically. - Valid element indices satisfy , where is the index and
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