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acosd(3M)

HP-UX 11i Version 2: December 2007 Update
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NAME

acosd(), acosdf(), acosdl(), acosdw(), acosdq() — degree-valued arccosine functions

SYNOPSIS

#include <math.h>

double acosd(double x);

float acosdf(float x);

Itanium(R)-based System Only

long double acosdl(long double x);

extended acosdw(extended x);

quad acosdq(quad x);

DESCRIPTION

acosd() returns the degree-valued arccosine of x, in the range 0 to 180.

acosdf() is a float version of acosd(); it takes a float argument and returns a float result.

Itanium-based System Only

acosdl() is a long double version of acosd(); it takes a long double argument and returns a long double result.

acosdw() is an extended version of acosd(); it takes an extended argument and returns an extended result.

acosdq() is equivalent to acosdl() on HPUX systems.

USAGE

To use these functions, compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options.

To use (for Itanium-based systems) acosdw() or acosdq(), compile also with the -fpwidetypes option.

To use any of these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line.

For more information, see the HP-UX Floating-Point Guide.

RETURN VALUE

acosd() returns +0.

If the magnitude of x is greater than one, acosd() returns NaN and raises the invalid exception.

If x is NaN, acosd() returns NaN.

ERRORS

If the magnitude of x is greater than one, acosd() sets errno to [EDOM].

Itanium-based System Only

HP-UX libm functions on IPF do not set errno by default. For errno setting, compile with the +Olibmerrno option.

SEE ALSO

acos(3M), asind(3M), atand(3M), atan2d(3M), cosd(3M), sind(3M), tand(3M), atan2d(3M), math(5).

STANDARDS CONFORMANCE

These functions are not specified by any standard.



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