CIMAG(3) Linux Programmers Manual CIMAG(3)
cimag, cimagf, cimagl - get imaginary part of a complex number
double cimag(double complex z);
float cimagf(float complex z);
long double cimagl(long double complex z);
Link with -lm.
The cimag() function returns the imaginary part of the complex number
z = creal(z) + I * cimag(z)
gcc also supports __imag__. That is a GNU extension.
cabs(3), creal(3), complex(7)
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