public static void Main(string[] args)
{
Storage storage = new Storage();
int counter = 0;
string myOperator = "";
string currentCommand = "", firstOp = "", secondOp = "";
int firstOpNum, secondOpNum, calcResult = 0;
START:
Console.WriteLine($"[{counter}]>");
currentCommand = Console.ReadLine();
// Return string[]{3} of operands/operator, or string[]{1} of constant
var commandKeys = Expression.getMathExpression(currentCommand);
firstOp = commandKeys[0];
bool isNumeric1 = int.TryParse(firstOp, out firstOpNum);
// Return desired "action" to trigger desired case
var action = InputValidation.validateCommand(commandKeys);
switch (action)
{
case "invalid":
Console.WriteLine("Invalid command");
break;
case "exit":
goto END;
case "last":
Console.WriteLine(storage.last);
break;
case "lastq":
Console.WriteLine(storage.lastq);
break;
case "getConstant":
if (Storage.myConstants.ContainsKey(firstOp))
{
Console.WriteLine(Storage.myConstants[firstOp]);
}
else
{
Console.WriteLine($"Constant '{firstOp}' does not exist!");
}
break;
default:
myOperator = commandKeys[1];
secondOp = commandKeys[2];
bool isNumeric2 = int.TryParse(secondOp, out secondOpNum);
switch (action)
{
case "saveConstant":
if (Storage.myConstants.ContainsKey(firstOp))
{
Console.WriteLine($"Error! Constant '{firstOp}' already saved.");
}
else
{
Console.WriteLine($"'{firstOp}' saved as '{secondOpNum}'");
Storage.myConstants[firstOp] = secondOpNum;
}
break;
case "calculate":
// confirm constant exists before attempting to calculate
if (!isNumeric1)
{
if (Storage.myConstants.ContainsKey(firstOp))
{
firstOpNum = Storage.myConstants[firstOp];
}
else
{
Console.WriteLine($"Constant '{firstOp}' does not exist!");
}
}
if (!isNumeric2)
{
if (Storage.myConstants.ContainsKey(secondOp))
{
secondOpNum = Storage.myConstants[secondOp];
}
else
{
Console.WriteLine($"Constant '{secondOp}' does not exist!");
}
}
calcResult = Calculator.calculate(firstOpNum, secondOpNum, myOperator);
// utilize Storage to save calculation outcome
storage.last = calcResult;
Console.WriteLine(calcResult);
break;
}
break;
}
// utilize Storage to save last valid user input calculation (unless user has typed "last" || "lastq" commands)
if (currentCommand.ToLower() != "last" && currentCommand.ToLower() != "lastq")
{
storage.lastq = currentCommand;
}
counter++;
goto START;
END:
Console.WriteLine("Bye!");
}