public static void Main()
{
var calculator = new PrimitiveCalculator();
var input = Console.ReadLine()
.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
while (!input[0].Equals("End"))
{
if (input[0].Equals("mode"))
{
switch (input[1][0])
{
case '/':
IStrategy division = new DivisionStrategy();
calculator.ChangeStrategy(division);
break;
case '*':
IStrategy multiply = new MultiplicationStrategy();
calculator.ChangeStrategy(multiply);
break;
case '+':
IStrategy addition = new AdditionStrategy();
calculator.ChangeStrategy(addition);
break;
case '-':
IStrategy subtraction = new SubtractionStrategy();
calculator.ChangeStrategy(subtraction);
break;
default:
throw new InvalidOperationException("Invalid operator!");
}
}
else
{
int firstOperand = int.Parse(input[0]);
int secondOperand = int.Parse(input[1]);
int result = calculator.PerformCalculation(firstOperand, secondOperand);
Console.WriteLine(result);
}
input = Console.ReadLine()
.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
}
}
public PrimitiveCalculator()
{
this.additionStrategy = new AdditionStrategy();
this.subtractionStrategy = new SubtractionStrategy();
this.isAddition = true;
}