lt08.cpp

一、教学目的： 能理解C++中运算符重载的需要性

class FileErrors{};

class NonExist:public FileErrors{};
class WrongFormat:public FileErrors{};
class DiskSeekError:public FileErrors{};

int f()
{
  try
  {
    //...
    throw WrongFormat;
  }

  catch(NonExist)
  {
//...
  }
  
  catch(DiskSeekError)
  {
//...
  }

  catch(FileErrors)
  {
//...
  }
  //...
}