HP-UX Reference (11i v1 00/12) - 3 Library Functions A-M (vol 6)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man3/!!!intro.3c
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a
atand(3M) atand(3M)
NAME
atand(), atandf() - degree-valued arctangent functions
SYNOPSIS
#include <math.h>
double atand(double x);
float atandf(float x);
DESCRIPTION
atand() is a degree-valued version of the atan() function. It returns the 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.
atand() and atandf() are not specified by any standard, but atandf() is named in accordance with
the conventions specified in the "Future Library Directions" section of the ANSI C standard.
To use these functions, compile either with the default -Ae option or with the -Aa and
-D_HPUX_SOURCE
options. Make sure your program includes <math.h>. Link in the math library by
specifying
-lm on the compiler or linker command line.
RETURN VALUE
If x is ±INFINITY, atand() returns ±90 respectively.
If x is NaN,
atand() returns NaN.
If the correct value after rounding would be smaller in magnitude than MINDOUBLE, atand() returns
zero.
ERRORS
No errors are defined.
SEE ALSO
acosd(3M), asind(3M), atan(3M), atan2d(3M), cosd(3M), sind(3M), tand(3M), math(5), values(5).
Section 3−−28 − 1 − HP-UX Release 11i: December 2000
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