cimag(3) Library Functions Manual cimag(3) NAME cimag, cimagf, cimagl - get imaginary part of a complex number LIBRARY Math library (libm, -lm) SYNOPSIS #include double cimag(double complex z); float cimagf(float complex z); long double cimagl(long double complex z); DESCRIPTION These functions return the imaginary part of the complex number z. One has: z = creal(z) + I * cimag(z) ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). allbox; lbx lb lb l l l. Interface Attribute Value T{ cimag(), cimagf(), cimagl() T} Thread safety MT-Safe VERSIONS GCC also supports __imag__. That is a GNU extension. STANDARDS C11, POSIX.1-2008. HISTORY glibc 2.1. C99, POSIX.1-2001. SEE ALSO cabs(3), creal(3), complex(7) Linux man-pages 6.18 2026-02-08 cimag(3)