1CREAL(3P)                  POSIX Programmer's Manual                 CREAL(3P)
2
3
4

PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
10

NAME

12       creal, crealf, creall — complex real functions
13

SYNOPSIS

15       #include <complex.h>
16
17       double creal(double complex z);
18       float crealf(float complex z);
19       long double creall(long double complex z);
20

DESCRIPTION

22       The functionality described on this reference page is aligned with  the
23       ISO C  standard.  Any  conflict between the requirements described here
24       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
25       defers to the ISO C standard.
26
27       These functions shall compute the real part of z.
28

RETURN VALUE

30       These functions shall return the real part value.
31

ERRORS

33       No errors are defined.
34
35       The following sections are informative.
36

EXAMPLES

38       None.
39

APPLICATION USAGE

41       For a variable z of type complex:
42
43
44           z == creal(z) + cimag(z)*I
45

RATIONALE

47       None.
48

FUTURE DIRECTIONS

50       None.
51

SEE ALSO

53       carg(), cimag(), conj(), cproj()
54
55       The Base Definitions volume of POSIX.1‐2017, <complex.h>
56

58       Portions  of  this text are reprinted and reproduced in electronic form
59       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
60       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
61       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
62       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
63       event of any discrepancy between this version and the original IEEE and
64       The  Open Group Standard, the original IEEE and The Open Group Standard
65       is the referee document. The original Standard can be  obtained  online
66       at http://www.opengroup.org/unix/online.html .
67
68       Any  typographical  or  formatting  errors that appear in this page are
69       most likely to have been introduced during the conversion of the source
70       files  to  man page format. To report such errors, see https://www.ker‐
71       nel.org/doc/man-pages/reporting_bugs.html .
72
73
74
75IEEE/The Open Group                  2017                            CREAL(3P)
Impressum