HP-UX Reference (11i v2 07/12) - 5 Miscellaneous (vol 9)

math(5) math(5)

is used, or deﬁned to be

MATH_ERREXCEPT otherwise.

It deﬁnes the following mathematical constants (type double) for user convenience:

M_E The base of natural logarithms (e).

M_LOG2E The base-2 logarithm of e.

M_LOG10E The base-10 logarithm of e.

M_LN2 The natural logarithm of 2.

M_LN10 The natural logarithm of 10.

M_PI The ratio of the circumference of a circle to its diameter. (There are also several frac-

tions of Pi, its reciprocal, and its square root:

M_PI_2, M_PI_4, M_1_PI, M_2_PI,

and

M_2_SQRTPI ).

M_SQRT2 The positive square root of 2.

M_SQRT1_2 The positive square root of 1/2.

For the deﬁnitions of various machine-dependent constants, see the description of the

<values.h>

header ﬁle.

To use one of the types extended or quad, or one of the macros HUGE_VALW

or HUGE_VALQ, compile

with the

-fpwidetypes option.

FILES

/usr/include/math.h