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What is a vector in C++?

In C++, vectors are used to store elements of similar data types. However, unlike arrays, the size of a vector can grow dynamically. That is, we can change the size of the vector during the execution of a program as per our requirements. Vectors are part of the C++ Standard Template Library.

What is std vector in C++?

std::vector (for T other than bool) meets the requirements of Container, AllocatorAwareContainer(since C++11), SequenceContainer, ContiguousContainer(since C++17) and ReversibleContainer . Member functions of std::vector are constexpr: it is possible to create and use std::vector objects in the evaluation of a constant expression.

How to access vector elements in C++?

In C++, we use the index number to access the vector elements. Here, we use the at () function to access the element from the specified index. For example, Element at Index 0: 1 Element at Index 2: 3 Element at Index 4: 5 Note: Like an array, we can also use the square brackets to access vector elements. For example,

What is a vector header in C++?

In C++, the vector header file provides various functions that can be used to perform different operations on a vector. Vector iterators are used to point to the memory address of a vector element. In some ways, they act like pointers in C++.

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