public Calculator ReturnObject(string operand)
{
Calculator calculator = null;
if (operand == "+" || operand == "-" || operand == "/" || operand == "*")
{
switch (operand)
{
case "+":
Addition addition = new Addition();
return(calculator = addition);
case "-":
Substraction substraction = new Substraction();
return(calculator = substraction);
case "*":
Multiplication multiplication = new Multiplication();
return(calculator = multiplication);
case "/":
Division division = new Division();
return(calculator = division);
}
}
return(calculator);
}
// Menghitung hasil operasi <operand1> <operator> <operand2>
public double calculate()
{
Expression temp = new TerminalExpression(0);
switch (operatorSign)
{
case "+":
temp = new Addition(operand1, operand2);
break;
case "-":
temp = new Substraction(operand1, operand2);
break;
case "*":
temp = new Multiplication(operand1, operand2);
break;
case "/":
temp = new Division(operand1, operand2);
break;
case "^":
temp = new Power(operand1, operand2);
break;
case "sqrt":
temp = new SquareRoot(operand1);
break;
case "mod":
temp = new Modulus(operand1, operand2);
break;
}
return(temp.solve());
}