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| .TH NEXTUP 3 2017-09-15 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl \- |
| return next floating-point number toward positive/negative infinity |
| .SH SYNOPSIS |
| .nf |
| .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" |
| .B #include <math.h> |
| .PP |
| .BI "double nextup(double " x ); |
| .BI "float nextupf(float " x ); |
| .BI "long double nextupl(long double " x ); |
| .PP |
| .BI "double nextdown(double " x ); |
| .BI "float nextdownf(float " x ); |
| .BI "long double nextdownl(long double " x ); |
| .fi |
| .PP |
| Link with \fI\-lm\fP. |
| .SH DESCRIPTION |
| The |
| .BR nextup (), |
| .BR nextupf (), |
| and |
| .BR nextupl () |
| functions return the next representable floating-point number greater than |
| .IR x . |
| .PP |
| If |
| .I x |
| is the smallest representable negative number in the corresponding type, |
| these functions return \-0. |
| If |
| .I x |
| is 0, the returned value is the smallest representable positive number |
| of the corresponding type. |
| .PP |
| If |
| .I x |
| is positive infinity, the returned value is positive infinity. |
| If |
| .I x |
| is negative infinity, |
| the returned value is the largest representable finite negative number |
| of the corresponding type. |
| .PP |
| If |
| .I x |
| is Nan, |
| the returned value is NaN. |
| .PP |
| The value returned by |
| .IR nextdown(x) |
| is |
| .IR \-nextup(\-x) , |
| and similarly for the other types. |
| .SH RETURN VALUE |
| See DESCRIPTION. |
| .\" .SH ERRORS |
| .SH VERSIONS |
| These functions first appeared in glibc in version 2.24. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lbw36 lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR nextup (), |
| .BR nextupf (), |
| .BR nextupl (), |
| .br |
| .BR nextdown (), |
| .BR nextdownf (), |
| .BR nextdownl () |
| T} Thread safety MT-Safe |
| .TE |
| .SH CONFORMING TO |
| These functions are described in |
| .IR "IEEE Std 754-2008 - Standard for Floating-Point Arithmetic" |
| and |
| .IR "ISO/IEC TS 18661". |
| .SH SEE ALSO |
| .BR nearbyint (3), |
| .BR nextafter (3) |