How do I access math constants (eg. M_PI) in Visual C++ 2008?

Question

I want to use the math constants, such as M_PI and M_E, in Visual C++ 2008. I assumed they were defined in the cmath header.

score 38 · Accepted Answer · edited Nov 11 '14 at 08:21

38

They are, but you also need to #define _USE_MATH_DEFINES before you #include <cmath>

edited Nov 11 '14 at 08:21

answered Apr 30 '09 at 09:49

davidi

1

Note that other includes can implicitly do including ``, so prefer to place `#define _USE_MATH_DEFINES` before any header includes. Place define into `stdafx.h` if you use precompiled headers. – Sergey Shambir Oct 13 '16 at 06:10

1 Answers1