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  • Can the downvoter comment on what is wrong with this answer. This is well researched and tested and being in use in real system. I had definitely like to improve it if something is wrong. Commented Jul 19, 2016 at 7:02
  • 1
    FYI, Borland C++ compilers also define M_PI without needing _USE_MATH_DEFINES Commented Jan 25, 2018 at 19:20