How to determine OpenCV version

Question

How to determine which version of OpenCV I have installed?

I am most interested in knowing a way of doing it programatically (and cross-platform), but I can

Answer 1

The version string is located in:

https://github.com/opencv/opencv/blob/master/modules/core/include/opencv2/core/version.hpp

Top of version.hpp, below the BSD license:
#define CV_VERSION_MAJOR    3
#define CV_VERSION_MINOR    2
#define CV_VERSION_REVISION 0