Source: classlib/include/mathcost.h

// MATHCOST.H - costanti comuni 


#undef M_E
#undef M_LOG2E
#undef M_LOG10E
#undef M_LN2
#undef M_LN10
#undef M_PI
#undef M_PI_2
#undef M_PI_4
#undef M_1_PI
#undef M_2_PI
#undef M_1_SQRTPI
#undef M_2_SQRTPI
#undef M_SQRT2
#undef M_SQRT_2

/* Constants rounded for 21 decimals. */
#define M_E         2.71828182845904523536
#define M_LOG2E     1.44269504088896340736
#define M_LOG10E    0.434294481903251827651
#define M_LN2       0.693147180559945309417
#define M_LN10      2.30258509299404568402
#define M_PI        3.14159265358979323846
#define M_PI_2      1.57079632679489661923
#define M_PI_4      0.785398163397448309616
#define M_1_PI      0.318309886183790671538
#define M_2_PI      0.636619772367581343076
#define M_1_SQRTPI  0.564189583547756286948
#define M_2_SQRTPI  1.12837916709551257390
#define M_SQRT2     1.41421356237309504880
#define M_SQRT_2    0.707106781186547524401