pr7

using System;

class MainClass
 {
           static double f(double x)
        {
            try
            {
               if (4-x*x <1) throw new Exception();
                else return Math.Log(4-x*x);
            }
            catch
            {
                throw;
            }
        }

  public static void Main ()
  {
    try
            {
                Console.Write("a=");
                double a = double.Parse(Console.ReadLine());
                Console.Write("b=");
                double b = double.Parse(Console.ReadLine());
                Console.Write("h=");
                double h = double.Parse(Console.ReadLine());
                for (double i = a; i <= b; i += h)
                    try
                    {
                        Console.WriteLine("y({0})={1:f4}", i, f(i));
                    }
                    catch
                    {
                        Console.WriteLine("y({0})=error", i);
                    }
            }
            catch (FormatException)
            {
                Console.WriteLine("Неверный формат ввода данных");
            }
            catch
            {
                Console.WriteLine("Неизвестная ошибка");
            }
        }
    }