Array Traversal and Common Operations in C++
Array traversal visits elements to inspect or modify them.
Summary
Array traversal visits elements to inspect or modify them. Built-in C++ arrays have fixed capacity, while std::vector supports resizing; both provide contiguous storage and indexed access.
Logical size counts occupied elements, whereas capacity counts available storage slots. For logical size , occupied indices satisfy . Keeping these quantities distinct prevents processing unused slots or writing beyond allocated storage.
| Operation | Time cost | Key condition |
|---|---|---|
| Indexed access or assignment |
🧠 Key Concepts
- Logical size
- Array capacity
- Valid indices
- Indexed traversal
- Range-based traversal
- Reference versus copy
- Linear search
- Element shifting
- Undefined behavior
- Operation complexity
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Array Traversal and Common Operations in C++
📘 Overview Array traversal visits elements to inspect or modify their values. Built-in C++ arrays have fixed capacity, while std::vector supports resizing; both provide contiguous storage and indexed access.
🧠 Key Idea Traversal processes elements within valid bounds, usually with an indexed loop or a range-based for loop. Indexed access is constant time, but searching an unsorted array or shifting elements generally takes linear time.
⚔️ Core Details: - Indexed traversal: for (std::size_t i = 0; i < n; ++i) visits the first elements of array a, provided does not exceed its capacity. - Range-based traversal: for (auto& value : a) permits element modification through a reference. - Indexed access and assignment, such as a[i] and a[i] = value, take
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