public string OnNewUserInput(UserInputEventArgs e)
{
string temp = string.Empty;
if (NewUserInput != null)
{
temp += NewUserInput.Invoke(e.FirstNumber, e.SecondNumber) + Environment.NewLine;
}
return(temp);
}
public static UserInputEventArgs UserInput()
{
//Console.WriteLine("Please Input first number");
//bool firstResult = int.TryParse(Console.ReadLine(), out int firstNumber);
//firstNumber = firstResult ? firstNumber : int.MaxValue;
//Console.WriteLine("Please Input second number");
//bool secondResult = int.TryParse(Console.ReadLine(), out int secondNumber);
//secondNumber = secondResult ? secondNumber : int.MaxValue;
Console.WriteLine("Please Input first number");
string firstInput = Console.ReadLine();
if (firstInput == string.Empty)
{
throw new ArgumentNullException();
}
int firstNumber = int.Parse(firstInput);
Console.WriteLine("Please Input second number");
string secondInput = Console.ReadLine();
if (secondInput == null)
{
throw new ArgumentNullException();
}
int secondNumber = int.Parse(Console.ReadLine());
if (firstNumber > int.MaxValue || firstNumber < int.MinValue || secondNumber < int.MinValue || secondNumber > int.MaxValue)
{
throw new OverflowException();
}
UserInputEventArgs user = new UserInputEventArgs(firstNumber, secondNumber);
return(user);
}
static void Main(string[] args)
{
UserInputEventArgs user = null;
//The program works as follows:
// the user first enters the numbers
try
{
user = UserInput();
}
catch (ArgumentNullException arg)
{
Console.WriteLine(arg.Message);
Console.WriteLine(arg.Source);
Console.WriteLine(arg.TargetSite);
}
catch (FormatException fm)
{
Console.WriteLine(fm);
}
catch (OverflowException ov)
{
Console.WriteLine(ov);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
//we have a counting machine,it has a metod OnNewUserInput,
//which as an argument gets an UserInputEventArgs object
CountingMashine countingMashine = new CountingMashine();
//We have a Calculate class,where there are Metods that perform mathematical calculations
Console.WriteLine("Choose what operation dou you want to perfom");
string operation = Console.ReadLine();
//This variable will contain the result of operations
StringBuilder resultofOperations = new StringBuilder();
try
{
switch (operation)
{
case "+":
countingMashine.NewUserInput += Calculate.Add;
resultofOperations.AppendFormat(countingMashine.OnNewUserInput(user));
break;
case "-":
countingMashine.NewUserInput += Calculate.Subtract;
resultofOperations.AppendFormat(countingMashine.OnNewUserInput(user));
break;
case "*":
countingMashine.NewUserInput += Calculate.Multiplicate;
resultofOperations.AppendFormat(countingMashine.OnNewUserInput(user));
break;
case "/":
countingMashine.NewUserInput += Calculate.Divide;
resultofOperations.AppendFormat(countingMashine.OnNewUserInput(user));
break;
default:
countingMashine.NewUserInput += Calculate.Add;
countingMashine.NewUserInput += Calculate.Subtract;
countingMashine.NewUserInput += Calculate.Multiplicate;
countingMashine.NewUserInput += Calculate.Divide;
resultofOperations.AppendFormat(countingMashine.OnNewUserInput(user));
//only contains return value of last Metod,its a very bad
break;
}
}
catch (NullReferenceException n)
{
Console.WriteLine(n.Message);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Console.WriteLine(resultofOperations);
//Thе constructor оf this class Calculate gets object of the class CountingMashine
//so we can subscribe to the event of the class Counting Mashine
//Calculate calculate = new Calculate(countingMashine);
}
