Hallo, dies ist ein Test.

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'\" te .\" Copyright (c) 2001, the Institute of Electrical and Electronics Engineers, Inc. and The Open Group. All Rights Reserved. .\" Copyright (c) 1992, X/Open Company Limited. All Rights Reserved. .\" Portions Copyright (c) 2006, 2016, Oracle and/or its affiliates. All rights reserved. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, 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. This notice shall appear on any product containing this material. .TH atan2 3M "27 Sept 2016" "Solaris 11.4" "Mathematical Library Functions" .SH NAME atan2, atan2f, atan2l \- arc tangent function .SH SYNOPSIS .LP .nf c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ] #include <math.h> \fBdouble\fR \fBatan2\fR(\fBdouble\fR \fIy\fR, \fBdouble\fR \fIx\fR); .fi .LP .nf \fBfloat\fR \fBatan2f\fR(\fBfloat\fR \fIy\fR, \fBfloat\fR \fIx\fR); .fi .LP .nf \fBlong double\fR \fBatan2l\fR(\fBlong double\fR \fIy\fR, \fBlong double\fR \fIx\fR); .fi .SH DESCRIPTION .sp .LP These functions compute the principal value of the arc tangent of \fIy/x\fR, using the signs of both arguments to determine the quadrant of the return value. .SH RETURN VALUES .sp .LP Upon successful completion, these functions return the arc tangent of \fIy\fR/\fIx\fR in the range [ \(mipi,pi ] radians. .sp .LP If \fIy\fR is \(+-0 and \fIx\fR is < 0, \(+-pi is returned. .sp .LP If \fIy\fR is \(+-0 and \fIx\fR is > 0, \(+-0 is returned. .sp .LP If \fIy\fR is < 0 and \fIx\fR is \(+-0, \(mipi/2 is returned. .sp .LP If \fIy\fR is > 0 and \fIx\fR is \(+-0, pi/2 is returned. .sp .LP If \fIx\fR is 0, a pole error does not occur. .sp .LP If either \fIx\fR or \fIy\fR is NaN, a NaN is returned. .sp .LP If \fIy\fR is \(+-0 and \fIx\fR is -0, \(+-pi is returned. .sp .LP If \fIy\fR is \(+-0 and \fIx\fR is +0, \(+-0 is returned. .sp .LP For finite values of \(+-\fIy\fR > 0, if x is \(miInf, \(+-pi is returned. .sp .LP For finite values of \(+-\fIy\fR > 0, if x is +Inf, \(+-0 is returned. .sp .LP For finite values of \fIx\fR, if \fIy\fR is \(+-Inf, \(+-pi/2 is returned. .sp .LP If \fIy\fR is \(+-Inf and \fIx\fR is \(miInf, \(+-3pi/4 is returned. .sp .LP If \fIy\fR is \(+-Inf and \fIx\fR is +Inf, \(+-pi/4 is returned. .sp .LP If both arguments are 0, a domain error does not occur. .SH ERRORS .sp .LP No errors are defined. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ Availability system/library/math _ MT-Level MT-Safe _ Standard See \fBstandards\fR(7). .TE .sp .SH SEE ALSO .sp .LP \fBmath.h\fR(3HEAD), \fBatan\fR(3M), \fBisnan\fR(3M)\fBtan\fR(3M), \fBattributes\fR(7), \fBstandards\fR(7)