https://en.cppreference.com/w/c/numeric/complex/imaginary https://en.cppreference.com/w/c/numeric/complex/imaginary #include <complex.h> ... double imagi

https://en.cppreference.com/w/c/numeric/complex/imaginary https://en.cppreference.com/w/c/numeric/complex/imaginary #include <complex.h> ... double imaginary i = -2.0*I; // pure imaginary double f = 1.0; // pure real double complex z = f + i; // complex number from gcc's complex.h: #ifdef __GNUC__ #if __STDC_VERSION__ < 199901 #define _Complex __complex__ #endif #define _Complex_I ((float _Complex)1.0i) #endif #ifdef __generic _Static_assert(__generic(_Complex_I, float _Complex, 1, 0), "_Complex_I must be of type float _Complex"); #endif #define complex _Complex #define I _Complex_I