Function SCIPrationalRoundReal 

pub unsafe extern "C" fn SCIPrationalRoundReal(
    rational: *mut SCIP_RATIONAL,
    roundmode: SCIP_ROUNDMODE_RAT,
) -> f64

gets the relaxation of a rational as a real

@note Requires MPFR if rational is not fp-representable and roundmode is different from SCIP_R_ROUND_NEAREST.