set::size() in C++ STL

In C++, set::size() function is a built-in used to find the number of elements in the given set container. It is the member function of std::set class defined inside <set> header file. In this article, we will learn about the std::set::size() method in C++.

Example:

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Syntax of set::size()

s.size();

Parameters

• This function does not require any parameter.

Return Value

• Returns the number of elements in the std::set container.
• If the set is empty, it returns 0.

More Examples of set::size()

The following examples demonstrates the use of set::size() function in different scenarios:

Example 1: Find the Size of Set Container

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Example 2: Find the Size of Empty Set