public boolean processMatch(ValueEval eval) {if(result == null) {result = eval;}else {if(result instanceof BlankEval) {result = eval;}else {if(!(eval instanceof BlankEval)) {result = ErrorEval.NUM_ERROR;return false;}}}return true;}

public boolean processMatch ( ValueEval eval ) { if ( result == null ) { result = eval ; } else { if ( result instanceof BlankEval ) { result = eval ; } else { if ( ! ( eval instanceof BlankEval ) ) { result = ErrorEval . NUM_ERROR ; return false ; } } } return true ; }
public bool ProcessMatch(ValueEval eval){if (result == null) {result = eval;}else {result = ErrorEval.NUM_ERROR;return false;}return true;}
