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

pi, the ratio of the circumference of a circle to its diameter.

M_PI_2

pi/2.

M_PI_4

pi/4.

M_1_PI

1/pi.

M_2_PI

2/pi.

M_2_SQRTPI

2 over the square root of pi.

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(3HEAD).

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