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M_PI(3)                  BSD Library Functions Manual                  M_PI(3)


NAME

     constants -- mathematical library constants


SYNOPSIS

     #include <math.h>


DESCRIPTION

     The header file math.h provides macros that define a number of useful
     numerical constants.


LIST OF CONSTANTS

     As required by the POSIX standard, these constants are double-precision
     literals, with enough digits specified as to ensure that they are cor-
     rectly rounded in double-precision:

     M_E

     "Euler's constant" or e; the base of the natural logarithm.

     M_LOG2E
     M_LOG10E

     The logarithms of e in base 2 and 10, respectively.

     M_LN2
     M_LN10

     The natural logarithms of 2 and 10, respectively.  Note that these are
     the reciprocals of the preceeding two values.

     M_PI
     M_PI_2
     M_PI_4

     pi, pi/2, and pi/4, respectively.

     M_1_PI
     M_2_PI

     1/pi and 2/pi, respectively.

     M_2_SQRTPI

     Two divided by the square root of pi.

     M_SQRT2
     M_SQRT_1_2

     The square root of two and its reciprocal, respectively.


SEE ALSO

     math(3), float(3),


STANDARDS

     The <math.h> functions and macros conform to the ISO/IEC 9899:2011 stan-
     dard.

BSD                              July 6, 2010                              BSD

Mac OS X 10.9.1 - Generated Mon Jan 6 18:43:12 CST 2014
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