creal (original) (raw)
The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.
A newer edition of this document exists here
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]
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 IEEE Std 1003.1-2001 defers to the ISO C standard.
These functions shall compute the real part of z.
![[Option End]](http://www.opengroup.org/onlinepubs/009695399/images/opt-end.gif)
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(), the Base Definitions volume of IEEE Std 1003.1-2001, <complex.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.
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