get imaginary part of a complex number
Math library (libm, -lm)
These functions return the imaginary 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 also supports __imag__. That is a GNU extension.
C11, POSIX.1-2008.
glibc 2.1. C99, POSIX.1-2001.