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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 a 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
*p, the ratio of the circumference of a circle to its diameter.
M_PI_2
*p/2.
M_PI_4
*p/4.
M_1_PI
1/*p.
M_2_PI
2/*p.
M_2_SQRTPI
2/sr*p.
M_SQRT2
The positive square root of 2.
M_SQRT1_2
The positive square root of 1/2.

The following mathematical constants are also defined in this header file:

MAXFLOAT
The maximum value of a non-infinite single-precision floating point number.
HUGE_VAL
positive infinity.

For the definitions of various machine-dependent constants see values(5) .

See Also

intro(3) , matherr(3M) , values(5)

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