Arccosine function.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <math.h>

double acos(double x);

float acosf(float);

long double acosl(long double);

Parameters for this function are:

x

float, double or long double

value to be computed

This function computes the arc values of cosine, sine, and tangent.

The function acos() may set errno to EDOM if the argument is not in the range of -1 to +1. See "Floating point error testing.," for information on newer error testing procedures.

See "Example of acos(), asin(), atan(), atan2() usage." for example usage.

acos() returns the arccosine of the argument x in radians. If the argument to acos() is not in the range of -1 to +1, the global variable errno may be set to EDOM and returns 0. See "Floating point error testing.," for information on newer error testing procedures.

"Inlined Intrinsics Option"

"cos"

"errno"