4.1 Mathematical Constants
The library ensures that the standard bsd mathematical constants
are defined. For reference, here is a list of the constants:
M_E- The base of exponentials, e
M_LOG2E- The base-2 logarithm of e, \log_2 (e)
M_LOG10E- The base-10 logarithm of e,
\log_10 (e)
M_SQRT2- The square root of two, \sqrt 2
M_SQRT1_2- The square root of one-half,
\sqrt{1/2}
M_SQRT3- The square root of three, \sqrt 3
M_PI- The constant pi, \pi
M_PI_2- Pi divided by two, \pi/2
M_PI_4- Pi divided by four, \pi/4
M_SQRTPI- The square root of pi, \sqrt\pi
M_2_SQRTPI- Two divided by the square root of pi, 2/\sqrt\pi
M_1_PI- The reciprocal of pi, 1/\pi
M_2_PI- Twice the reciprocal of pi, 2/\pi
M_LN10- The natural logarithm of ten, \ln(10)
M_LN2- The natural logarithm of two, \ln(2)
M_LNPI- The natural logarithm of pi, \ln(\pi)
M_EULER- Euler's constant, \gamma
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