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acos

Syntax

 
#include <math.h>

double acos(double x);

Description

This function returns the angle in the range [0..Pi] radians whose cosine is x. If the absolute value of x is greater than 1, a domain error occurs, and errno is set to EDOM.

Return Value

The arc cosine, in radians, of x. If the absolute value of x is greater than 1, the function returns a NaN.

Portability

ANSI/ISO C C89; C99
POSIX 1003.2-1992; 1003.1-2001


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