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The macro MPC_SET_X_Y is designed to serve as the body of an assignment
function and cannot be used by itself.
The real_suffix and imag_suffix parameters are the
types of the real and imaginary part, that is, the x in the
mpfr_set_x function one would use to set the part;
for the mpfr type, use fr.
real (respectively imag) is the value you want to assign to the
real (resp. imaginary) part, its type must conform to real_suffix
(resp. imag_suffix).
rnd is the mpc_rnd_t rounding mode.
The return value is the usual inexact value (see Return
Value).
For instance, you can define mpc_set_ui_fr as follows:
int mpc_set_ui_fr (mpc_t rop, unsigned long int re, mpfr_t im, mpc_rnd_t rnd)
MPC_SET_X_Y (ui, fr, rop, re, im, rnd);