creal(3) Library Functions Manual creal(3)

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

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).

Interface Attribute Value
creal (), crealf (), creall () Thread safety MT-Safe

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)

2024-05-02 Linux man-pages 6.9.1