What are vectors in C++?

Vectors in C++ are sequence containers representing arrays that can change in size. They use contiguous storage locations for their elements, which means that their elements can also be accessed using offsets on regular pointers to its elements, and just as efficiently as in arrays. Following Pointers will be covered in this article:

What does 'include vector> mean?

By writing #include , you are telling the compiler to not only use your own code, but to also compile a file called vector. This file is actually somewhere on your harddrive (if you use GNU/Linux, it's probably located at /usr/include/c++/ [GCC_VERSION]/vector ).

What is std-vector in C++?

std::vector in C++ is the class template that contains the vector container and its member functions. It is defined inside the header file. The member functions of std::vector class provide various functionalities to vector containers. Some commonly used member functions are written below:

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,