atan2d64(3M) atan2d64(3M)[top]NAMEatan2d64(), atan2d128(), atan2d32() - decimal arctangent and quadrant functionsSYNOPSISDESCRIPTIONThe function returns the arctangent of y/x, 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. is a version of it takes arguments and returns a result. These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.USAGETo use any of these functions, compile with the option. Make sure your program defines and then includes Link in the math library by specifying or on the linking 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 0, returns If y and x is greater than 0, returns If y is less than 0 and x is 0, returns If y is greater than 0 and x is 0, returns If y is greater than 0 and x is −infinity, returns If y is less than 0 and x is −infinity, If y is greater than 0 and x is infinity, returns +0. If y is less than 0 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. raises the inexact exception whenever a rounded result does not equal the mathematical result.ERRORSNo errors are defined.SEE ALSOacosd64(3M), asind64(3M), atand64(3M), cosd64(3M), sind64(3M), tand64(3M), math(5).STANDARDS CONFORMANCEThese functions conform to ISO/IEC TR 24732, "Extension for the pro‐ gramming language C to support decimal floating-point arithmetic". HP Integrity Server Only atan2d64(3M)

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