The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group
NAME
creal, crealf, creall - complex real functions
SYNOPSIS
#include <complex.h>
double creal(double complex z);
float crealf(float complex z);
long double creall(long double complex z);
DESCRIPTION
[CX] ![[Option Start]](../images/opt-start.gif)
The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C
standard.
![[Option End]](../images/opt-end.gif)
These functions shall compute the real part of z.
RETURN VALUE
These functions shall return the real part value.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
For a variable z of type complex:
z == creal(z) + cimag(z)*I
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
carg, cimag, conj, cproj
XBD <complex.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.
End of informative text.
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