substr in C++

In this article, we will learn about substr() function in C++ which is used to extract a sub-string from a given string.

What is a String?

A string is a sequence of characters which is used to alter or store text. In C++, string is a datatype which is used to store continuous characters and it ends when they encounter a space or a newline.

The C++ STL(Standard Template Library) provides a string class called 'std::string' that represents a string.

In C++, strings are zero-indexed, so the first c...