using System;

/// <remarks> Reciprocal  demonstrates arithmetic
///   assumed input: an integer 
///   guaranteed output: the number's reciprocal</remarks>

public class Reciprocal
{  public static void Main()
   {  Console.Write("Please type a nonzero int: ");
      string input = "";
      int n = 1;

      try
      { input = Console.ReadLine(); 
        n = Int32.Parse(input); 
      } catch(Exception ex)
             { // write the internal error, as a `string':
               Console.WriteLine(ex.ToString());
 
               Console.WriteLine("I'll compute 1/1");
             }

      double answer = 1.0 / n;

      Console.Write("1.0 / " + input + "  is  ");
      Console.WriteLine(answer); 

      Console.ReadLine();  // wait for human to press Enter
    }
}