projects / thirdparty / man-pages.git / blame
| Commit | Line | Data |
|---|---|---|
| fea681da | 1 | .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) |
| 2297bf0e | 2 | .\" |
| 38f20bb9 | 3 | .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE) |
| fea681da | 4 | .\" Distributed under GPL |
| 38f20bb9 | 5 | .\" %%%LICENSE_END |
| fea681da | 6 | .\" |
| c73595c2 | 7 | .TH CREAL 3 2015-04-19 "" "Linux Programmer's Manual" |
| fea681da MK |
8 | .SH NAME |
| 9 | creal, crealf, creall \- get real part of a complex number | |
| 10 | .SH SYNOPSIS | |
| 11 | .B #include <complex.h> | |
| 12 | .sp | |
| 13 | .BI "double creal(double complex " z ); | |
| d39541ec | 14 | .br |
| fea681da | 15 | .BI "float crealf(float complex " z ); |
| d39541ec | 16 | .br |
| fea681da MK |
17 | .BI "long double creall(long double complex " z ); |
| 18 | .sp | |
| 20c58d70 | 19 | Link with \fI\-lm\fP. |
| fea681da | 20 | .SH DESCRIPTION |
| 5600f73a | 21 | These functions return the real part of the complex number |
| e5056894 | 22 | .IR z . |
| fea681da | 23 | .LP |
| 658670de MK |
24 | One has: |
| 25 | .nf | |
| 26 | ||
| 27 | z = creal(z) + I * cimag(z) | |
| 28 | .fi | |
| f0d7ce1d MK |
29 | .SH VERSIONS |
| 30 | These functions first appeared in glibc in version 2.1. | |
| 9f4658a7 | 31 | .SH ATTRIBUTES |
| d5b7e514 MK |
32 | For an explanation of the terms used in this section, see |
| 33 | .BR attributes (7). | |
| 34 | .TS | |
| 35 | allbox; | |
| 36 | lbw27 lb lb | |
| 37 | l l l. | |
| 38 | Interface Attribute Value | |
| 39 | T{ | |
| 9f4658a7 PH |
40 | .BR creal (), |
| 41 | .BR crealf (), | |
| 9f4658a7 | 42 | .BR creall () |
| d5b7e514 MK |
43 | T} Thread safety MT-Safe |
| 44 | .TE | |
| 47297adb | 45 | .SH CONFORMING TO |
| 9a74e018 | 46 | C99, POSIX.1-2001, POSIX.1-2008. |
| 19c98696 MK |
47 | .SH NOTES |
| 48 | The gcc supports also __real__. | |
| 49 | That is a GNU extension. | |
| 47297adb | 50 | .SH SEE ALSO |
| fea681da MK |
51 | .BR cabs (3), |
| 52 | .BR cimag (3), | |
| a8bda636 | 53 | .BR complex (7) |