/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson
Publisher: Apress L.P.
ISBN: 1-893115-62-3
*/
// 04 - Exception Handling\User-Defined Exception Classes
// copyright 2000 Eric Gunnerson
using System;
public class UserDefinedExceptionClasses
{
public static void Main()
{
Summer summer = new Summer();
try
{
summer.DoAverage();
}
catch (CountIsZeroException e)
{
Console.WriteLine("CountIsZeroException: {0}", e);
}
}
}
public class CountIsZeroException: ApplicationException
{
public CountIsZeroException()
{
}
public CountIsZeroException(string message)
: base(message)
{
}
public CountIsZeroException(string message, Exception inner)
: base(message, inner)
{
}
}
public class Summer
{
int sum = 0;
int count = 0;
float average;
public void DoAverage()
{
if (count == 0)
throw(new CountIsZeroException("Zero count in DoAverage"));
else
average = sum / count;
}
}
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