public void Сalculate(CalculatorTask task)
{
Operation operation = Unknown;
switch (task.command)
{
case Command.Add:
operation = Add;
break;
case Command.Subtract:
operation = Subtract;
break;
case Command.Multiply:
operation = Multiply;
break;
case Command.Divide:
operation = Divide;
break;
}
CalculatorResult result = operation(task.number1, task.number2);
Subscribe?.Invoke(task, result);
}
public static void Main(string[] args)
{
Calculator calculator = new Calculator();
calculator.Subscribe += ShowResult;
while (true)
{
try
{
CalculatorTask task = InputCalculatorTask();
calculator.Сalculate(task);
} catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
public static void ShowResult(CalculatorTask task, CalculatorResult result)
{
if (!result.unknown)
{
Console.Write($"{task.number1} {task.symbol} {task.number2} = ");
if (result.infinity)
{
Console.WriteLine("Infinity");
}
else
{
Console.WriteLine(result.data);
}
}
else
{
Console.WriteLine("Unknown operation");
}
}
public static CalculatorTask InputCalculatorTask()
{
CalculatorTask task = new CalculatorTask();
Console.WriteLine();
Console.Write("A: ");
task.number1 = Convert.ToDouble(Console.ReadLine());
Console.Write("B: ");
task.number2 = Convert.ToDouble(Console.ReadLine());
Console.Write("Operation: ");
task.symbol = Console.ReadLine();
switch (task.symbol)
{
case "+":
task.command = Command.Add;
break;
case "-":
task.command = Command.Subtract;
break;
case "*":
task.command = Command.Multiply;
break;
case "/":
case ":":
task.command = Command.Divide;
break;
default:
task.command = Command.Unknown;
break;
}
return(task);
}
