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nextdownl(3) [linux man page]

NEXTUP(3)						     Linux Programmer's Manual							 NEXTUP(3)

NAME
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return next floating-point number toward positive/negative infinity SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <math.h> double nextup(double x); float nextupf(float x); long double nextupl(long double x); double nextdown(double x); float nextdownf(float x); long double nextdownl(long double x); Link with -lm. DESCRIPTION
The nextup(), nextupf(), and nextupl() functions return the next representable floating-point number greater than x. If x is the smallest representable negative number in the corresponding type, these functions return -0. If x is 0, the returned value is the smallest representable positive number of the corresponding type. If x is positive infinity, the returned value is positive infinity. If x is negative infinity, the returned value is the largest repre- sentable finite negative number of the corresponding type. If x is Nan, the returned value is NaN. The value returned by nextdown(x) is -nextup(-x), and similarly for the other types. RETURN VALUE
See DESCRIPTION. VERSIONS
These functions first appeared in glibc in version 2.24. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-------------------------------------+---------------+---------+ |Interface | Attribute | Value | +-------------------------------------+---------------+---------+ |nextup(), nextupf(), nextupl(), | Thread safety | MT-Safe | |nextdown(), nextdownf(), nextdownl() | | | +-------------------------------------+---------------+---------+ CONFORMING TO
These functions are described in IEEE Std 754-2008 - Standard for Floating-Point Arithmetic and ISO/IEC TS 18661. SEE ALSO
nearbyint(3), nextafter(3) GNU
2017-09-15 NEXTUP(3)

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ATAN2(3)						     Linux Programmer's Manual							  ATAN2(3)

NAME
atan2, atan2f, atan2l - arc tangent function of two variables SYNOPSIS
#include <math.h> double atan2(double y, double x); float atan2f(float y, float x); long double atan2l(long double y, long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): atan2f(), atan2l(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE DESCRIPTION
These functions calculate the principal value of the arc tangent of y/x, using the signs of the two arguments to determine the quadrant of the result. RETURN VALUE
On success, these functions return the principal value of the arc tangent of y/x in radians; the return value is in the range [-pi, pi]. If y is +0 (-0) and x is less than 0, +pi (-pi) is returned. If y is +0 (-0) and x is greater than 0, +0 (-0) is returned. If y is less than 0 and x is +0 or -0, -pi/2 is returned. If y is greater than 0 and x is +0 or -0, pi/2 is returned. If either x or y is NaN, a NaN is returned. If y is +0 (-0) and x is -0, +pi (-pi) is returned. If y is +0 (-0) and x is +0, +0 (-0) is returned. If y is a finite value greater (less) than 0, and x is negative infinity, +pi (-pi) is returned. If y is a finite value greater (less) than 0, and x is positive infinity, +0 (-0) is returned. If y is positive infinity (negative infinity), and x is finite, pi/2 (-pi/2) is returned. If y is positive infinity (negative infinity) and x is negative infinity, +3*pi/4 (-3*pi/4) is returned. If y is positive infinity (negative infinity) and x is positive infinity, +pi/4 (-pi/4) is returned. ERRORS
No errors occur. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------+---------------+---------+ |atan2(), atan2f(), atan2l() | Thread safety | MT-Safe | +-----------------------------+---------------+---------+ CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD, C89. SEE ALSO
acos(3), asin(3), atan(3), carg(3), cos(3), sin(3), tan(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2017-09-15 ATAN2(3)
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