180. Static Memory

Question.12

A class has a static method:

class Math {
public:
   static constexpr float PI = 3.14159f;
   static float deg_to_rad(float d) { return d * PI / 180.0f; }
};

float rad = Math::deg_to_rad(90);

Why can deg_to_rad be called without creating a Math object?

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All methods can be called without objects
Static methods belong to the class, not any instance -- they have no this pointer and can only access static members
deg_to_rad is a global function
constexpr makes it callable without an object

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