atand.3m (2010 09)

a
atand(3M) atand(3M)
NAME
atand( ), atandf( ), atandl( ), atandw( ), atandq( ) - degree-valued arctangent functions
SYNOPSIS
#include <math.h>
double atand(double x);
float atandf(float x);
HP Integrity Server Only
long double atandl(long double x);
extended atandw(extended x);
quad atandq(quad x);
DESCRIPTION
atand() returns the degree-valued arctangent of x, in the range −90 to 90.
atandf() is a float version of atand(); it takes a
float argument and returns a float result.
Integrity Server Only
atandl() is a long double version of atand(); it takes a long double argument and returns a
long double result.
atandw() is an extended version of atand(); it takes an extended argument and returns an
extended result.
atandq() is equivalent to atandl() on HP-UX 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 Integrity servers)
atandw() or atandq(), 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 for HP Integrity servers at the following site:
http://www.hp.com/go/fp
.
RETURN VALUE
atand(±0) returns ±0.
If x is ±INFINITY,
atand() returns ±90 respectively.
If x is NaN,
atand() returns NaN.
ERRORS
No errors are defined.
SEE ALSO
acosd(3M), asind(3M), atan(3M), atan2d(3M), cosd(3M), sind(3M), tand(3M), atan2d(3M), math(5).
STANDARDS CONFORMANCE
These functions are not specified by any standard.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1