सरल निदान: exceptions बनाम guard checks

using System;

public class Program
{
  public static bool TryDivide(int a, int b, out int result)
  {
    if (b == 0)
    {
      result = 0;
      return false; // guard check fails
    }
    result = a / b;
    return true;
  }

  public static void Main(string[] args)
  {
    int r;
    bool ok = TryDivide(10, 0, out r);
    Console.WriteLine("ok=" + ok + " result=" + r);
  }
}

using System;

public class Program
{
  public static int PriceWithTax(int price, int ratePercent)
  {
    if (price < 0)
    {
      throw new ArgumentOutOfRangeException("price");
    }
    if (ratePercent < 0 || ratePercent > 100)
    {
      throw new ArgumentOutOfRangeException("ratePercent");
    }
    return price + (price * ratePercent / 100);
  }

  public static void Main(string[] args)
  {
    try
    {
      int total = PriceWithTax(100, 20);
      Console.WriteLine("Total=" + total);
    }
    catch (Exception ex)
    {
      Console.WriteLine("Error: " + ex.Message);
    }
  }
}

using System;

public class Program
{
  public static bool TryParsePrice(string text, out int value)
  {
    return int.TryParse(text, out value); // guard check
  }

  public static int GetDiscount(int code)
  {
    if (code < 0) throw new ArgumentException("Invalid code"); // exception
    return 10;
  }

  public static void Main(string[] args)
  {
    int v;
    if (TryParsePrice("123", out v))
    {
      Console.WriteLine("Parsed " + v);
    }

    try
    {
      int d = GetDiscount(-1);
      Console.WriteLine("Discount=" + d);
    }
    catch (Exception ex)
    {
      Console.WriteLine("Error: " + ex.Message);
    }
  }
}

using System;

public class Program
{
  public static void Main(string[] args)
  {
    try
    {
      int x = 10;
      int y = 0;
      int z = x / y; // will throw DivideByZeroException
      Console.WriteLine(z);
    }
    catch (DivideByZeroException ex)
    {
      Console.WriteLine("Cannot divide by zero: " + ex.Message);
    }
  }
}