private EquationStep.eOperator setOperator(char op){
		EquationStep.eOperator newOp = null;
		switch(op)
		{
		case '+': newOp = EquationStep.eOperator.eOperator_Plus;
			break;
		case '-': newOp = EquationStep.eOperator.eOperator_Subtract;
			break;
		case '/': newOp = EquationStep.eOperator.eOperator_Divide;
			break;
		case '*': newOp = EquationStep.eOperator.eOperator_Multiply;
		}
		return newOp;
	}