Function SCIPprintDualSol 

pub unsafe extern "C" fn SCIPprintDualSol(
    scip: *mut SCIP,
    file: *mut FILE,
    printzeros: c_uint,
) -> SCIP_RETCODE

outputs dual solution from LP solver to file stream

@note This only works if no presolving has been performed, which can be checked by calling method \ref SCIPhasPerformedPresolve().

@return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref SCIP_Retcode “SCIP_RETCODE” for a complete list of error codes.

@pre This method can be called if SCIP is in one of the following stages: - \ref SCIP_STAGE_SOLVED