== Why is this an issue?

Starting from {cpp}20, mathematical constants are defined in the header ``++<numbers>++``.

You should prefer using them instead of hardcoding your own constants.


=== Noncompliant code example

[source,cpp]
----
const double pi = 3.14159265358979323846; // Noncompliant

auto computeCirclePerimeter(double radius) {
    return 2 * pi * radius;
}
----


=== Compliant solution

[source,cpp]
----
#include <numbers>

auto computeCirclePerimeter(double radius) {
    return 2 * std::numbers::pi * radius;
}
----


ifdef::env-github,rspecator-view[]
'''
== Comments And Links
(visible only on this page)

=== is related to: S2904

=== is related to: S109

endif::env-github,rspecator-view[]