creal(3) Library Functions Manual creal(3) creal, crealf, creall - LIBRARY Math library (libm, -lm) #include double creal(double complex z); float crealf(float complex z); long double creall(long double complex z); z. : z = creal(z) + I * cimag(z) attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |creal(), crealf(), creall() | | 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) Azamat Hackimov , Dmitriy S. Seregin , Dmitry Bolkhovskikh , Katrin Kutepova , Yuri Kozlov ; GNU 3 , . . , , . Linux man-pages 6.06 31 2023 . creal(3)