creal, crealf, creall

Math library (libm, -lm)

#include <complex.h>

double creal(double complex z);
float crealf(float complex z);
long double creall(long double complex z);

These functions return the real part of the complex number z.

One has:

    z = creal(z) + I * cimag(z)

For an explanation of the terms used in this section, see attributes(7).

GCC supports also __real__. That is a GNU extension.

C11, POSIX.1-2008.

glibc 2.1. C99, POSIX.1-2001.

cabs(3), cimag(3), complex(7)