MATH(5) MATH(5)
NAME
math - math functions and constants
SYNOPSIS
#include <math.h>
DESCRIPTION
This file contains declarations of all the functions in the
Math Library (described in Section 3M), as well as various
functions in the C Library (Section 3C) that return
floating-point values.
It defines the structure and constants used by the
matherr(3M) error-handling mechanisms, including the
following constant used as an error-return value:
HUGE The maximum value of a single-precision
floating-point number.
The following mathematical constants are defined 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 π, the ratio of the circumference of a
circle to its diameter.
M_PI_2 π/2.
M_PI_4 π/4.
M_1_PI 1/π.
Page 1 May 1989
MATH(5) MATH(5)
M_2_PI 2/π.
M_2_SQRTPI 2/\/π.
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.
SEE ALSO
intro(3), matherr(3M), values(5).
Page 2 May 1989