How do I use std::numbers (C++20) in C++?

In C++20, the std::numbers library provides a set of mathematical constants that can be used directly in your code. This simplifies the use of fundamental constants like pi, e, and more, making your code cleaner and more readable.

Here’s how to use std::numbers in a C++ program:


    #include 
    #include 

    int main() {
        // Using constants from std::numbers
        double circumference(double radius) {
            return 2 * std::numbers::pi * radius;
        }

        double radius = 5.0;
        std::cout << "Circumference of a circle with radius " << radius << " is: " 
                  << circumference(radius) << std::endl;

        return 0;
    }