1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
3 .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
4 .\" Distributed under GPL
7 .TH CREAL 3 2021-03-22 "" "Linux Programmer's Manual"
9 creal, crealf, creall \- get real part of a complex number
12 .B #include <complex.h>
14 .BI "double creal(double complex " z );
15 .BI "float crealf(float complex " z );
16 .BI "long double creall(long double complex " z );
21 These functions return the real part of the complex number
27 z = creal(z) + I * cimag(z)
30 These functions first appeared in glibc in version 2.1.
32 For an explanation of the terms used in this section, see
40 Interface Attribute Value
45 T} Thread safety MT-Safe
51 C99, POSIX.1-2001, POSIX.1-2008.
53 The gcc supports also __real__.
54 That is a GNU extension.