public double get(int i) {
		if (i < 0 || i >= N) throw new IllegalArgumentException("Illegal index " + i + " should be > 0 and < " + N);
		if (symbolTable.contains(i)) return symbolTable.get(i);
		else                return 0.0;
	}
public double get ( int i ) { if ( i < 0 || i >= N ) throw new IllegalArgumentException ( "Illegal index " + i + " should be > 0 and < " + N ) ; if ( symbolTable . contains ( i ) ) return symbolTable . get ( i ) ; else return 0.0 ; }
get a value

@param i
@return  return symbolTable[i]