Function SCIPgetGap 

pub unsafe extern "C" fn SCIPgetGap(scip: *mut SCIP) -> f64

gets current gap |(primalbound - dualbound)/min(|primalbound|,|dualbound|)| if both bounds have same sign, or infinity, if they have opposite sign

@return the current gap |(primalbound - dualbound)/min(|primalbound|,|dualbound|)| if both bounds have same sign, or infinity, if they have opposite sign

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