mirror of https://github.com/mkerrisk/man-pages
54 lines
1.1 KiB
Groff
54 lines
1.1 KiB
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" Distributed under GPL
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.\" %%%LICENSE_END
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.\"
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.TH CREAL 3 2015-04-19 "" "Linux Programmer's Manual"
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.SH NAME
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creal, crealf, creall \- get real part of a complex number
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.SH SYNOPSIS
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.B #include <complex.h>
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.PP
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.BI "double creal(double complex " z );
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.br
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.BI "float crealf(float complex " z );
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.br
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.BI "long double creall(long double complex " z );
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.PP
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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These functions return the real part of the complex number
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.IR z .
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.PP
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One has:
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.PP
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.nf
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z = creal(z) + I * cimag(z)
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.fi
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.SH VERSIONS
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These functions first appeared in glibc in version 2.1.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lbw27 lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR creal (),
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.BR crealf (),
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.BR creall ()
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T} Thread safety MT-Safe
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.TE
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.SH CONFORMING TO
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C99, POSIX.1-2001, POSIX.1-2008.
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.SH NOTES
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The gcc supports also __real__.
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That is a GNU extension.
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.SH SEE ALSO
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.BR cabs (3),
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.BR cimag (3),
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.BR complex (7)
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