catan-catanf-catanl.md

description	Learn more about: catan, catanf, catanl
title	catan, catanf, catanl
ms.date	11/04/2016
api_name	catan catanf catanl
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topic_type	apiref
f1_keywords	catan catanf catanl complex/catan complex/catanf complex/catanl
helpviewer_keywords	catan function catanf function catanl function
ms.assetid	8415ed9c-7909-4d08-b532-4630bafdc7e8

catan, catanf, catanl

Retrieves the arctangent of a complex number with branch cuts outside the interval [-1; +1] along the imaginary axis.

Syntax

_Dcomplex catan( _Dcomplex z );
_Fcomplex catanf( _Fcomplex z );
_Lcomplex catanl( _Lcomplex z );

_Fcomplex catan( _Fcomplex z );  // C++ only
_Lcomplex catan( _Lcomplex z );  // C++ only

Parameters

z
A complex number that represents an angle, in radians.

Return value

The arctangent of z, in radians. The result is unbounded along the imaginary axis, and in the interval [-π/2; +π/2] along the real axis.

Remarks

Because C++ allows overloading, you can call overloads of catan that take and return _Fcomplex and _Lcomplex values. In a C program, catan always takes and returns a _Dcomplex value.

Requirements

Routine	C header	C++ header
catan, catanf, catanl	<complex.h>	<ccomplex>

For more compatibility information, see Compatibility.

See also

Alphabetical function reference
catanh, catanhf, catanhl
ctanh, ctanhf, ctanhl
csinh, csinhf, csinhl
casinh, casinhf, casinhl
ccosh, ccoshf, ccoshl
cacosh, cacoshf, cacoshl
cacos, cacosf, cacosl
ctan, ctanf, ctanl
csin, csinf, csinl
casin, casinf, casinl
ccos, ccosf, ccosl
csqrt, csqrtf, csqrtl