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CATAN(3P) POSIX Programmer's Manual CATAN(3P)PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may dif- fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.NAMEcatan, catanf, catanl - complex arc tangent functionsSYNOPSIS#include<complex.h>doublecomplexcatan(doublecomplexz);floatcomplexcatanf(floatcomplexz);longdoublecomplexcatanl(longdoublecomplexz);DESCRIPTIONThese functions shall compute the complex arc tangent ofz, with branch cuts outside the interval [-i, +i] along the imaginary axis.RETURNVALUEThese functions shall return the complex arc tangent value, in the range of a strip mathematically unbounded along the imaginary axis and in the interval [-pi/2, +pi/2] along the real axis.ERRORSNo errors are defined.Thefollowingsectionsareinformative.EXAMPLESNone.APPLICATIONUSAGENone.RATIONALENone.FUTUREDIRECTIONSNone.SEEALSOctan(), the Base Definitions volume of IEEE Std 1003.1-2001,<complex.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan- dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica- tions Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan- dard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE/The Open Group 2003 CATAN(3P)