math(5) File Formats Manual math(5)
Name
math - math functions and constants
Syntax
#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 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 n, the ratio of the circumference of a circle to its diameter.
M_PI_2 n/2.
M_PI_4 n/4.
M_1_PI 1/n.
M_2_PI 2/n.
M_2_SQRTPI 2//n.
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), values(5)
RISC math(5)
