|
|
HP-UX Reference > Aatand(3M)HP-UX 11i Version 2: December 2007 Update |
|
NAMEatand(), atandf(), atandl(), atandw(), atandq() — degree-valued arctangent functions DESCRIPTIONatand() 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. USAGETo 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) 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. RETURN VALUEatand(±0) returns ±0. If x is ±INFINITY, atand() returns ±90 respectively. If x is NaN, atand() returns NaN. SEE ALSOacosd(3M), asind(3M), atan(3M), atan2d(3M), cosd(3M), sind(3M), tand(3M), atan2d(3M), math(5). |
|