講一個經典案例除以0，首先創造一個DivideByZeroEXception類別繼承runtime_error。在C++中double除以0並不會報錯，所以主動用throw丟出DivideByZeroEXception，並在catch段落呼叫what()方法顯示錯誤原因，最外面用while()產生一個無限迴圈

while ( cin >> number1 >> number2 ) 
{
   // try block contains code that might throw exception
   // and code that should not execute if an exception occurs
   try 
   {
      result = quotient( number1, number2 );
      cout << "The quotient is: " << result << endl;
   } // end try

   // exception handler handles a divide-by-zero exception
   catch ( DivideByZeroException &divideByZeroException ) 
   {
      cout << "Exception occurred: " 
         << divideByZeroException.what() << endl;
   } // end catch

   cout << "\nEnter two integers (end-of-file to end): ";
} // end while

詳細範例見Fig. 16.1: DivideByZeroException.h與Fig. 16.2: Fig16_02.cpp