atan2d(3M) atan2d(3M)[top]NAMEatan2d(), atan2df(), atan2dl(), atan2dw(), atan2dq() - degree-valued arctangent-and-quadrant functionsSYNOPSISHP Integrity Server OnlyDESCRIPTIONis a degree-valued version of the function. It returns the arctangent of y/x, in the range −180 to 180, using the signs of both arguments to determine the quadrant of the return value. is a version of it takes arguments and returns a result. Integrity Server Only is a version of it takes arguments and returns a result. is an version of it takes arguments and returns an result. is equivalent to on HP-UX systems.USAGETo use these functions compile either with the default option or with the and the options. To use (for Integrity servers) or compile also with the option. To use any of these functions, make sure your program includes and link in the math library by specifying on the compiler or linker command line. For more information, see the at the following site:RETURN VALUEIf y and x is −0, If y and x is +0, If y and x is less than zero, If y and x is greater than zero, returns If y is less than zero and x is zero, returns −90. If y is greater than zero and x is zero, returns 90. If y is greater than zero and x is −INFINITY, returns 180. If y is less than zero and x is −INFINITY, returns −180. If y is greater than zero and x is INFINITY, returns +0. If y is less than zero and x is INFINITY, returns −0. If y and x is finite, returns If y and x is −INFINITY, returns If y and x is +INFINITY, returns If x or y is NaN, returns NaN.ERRORSNo errors are defined.SEE ALSOacosd(3M), asind(3M), atand(3M), atan2(3M), cosd(3M), sind(3M), tand(3M), math(5).STANDARDS CONFORMANCEThese functions are not specified by any standard. atan2d(3M)

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