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.

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] 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. [Option End]

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(), 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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