creal, crealf, creall − get real part of a complex number

#include <complex.h>

double creal(double complex z);

float crealf(float double complex z);

long double creall(long double complex z);

The creal() function returns the real part of the complex number z.

One has z = creal(z) + I*cimag(z).

The gcc supports also __real__. That is a GNU extension.

C99

cabs(3), cimag(3), complex(5)