Exceptions
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I am working on a class project as layed out by the instructor. This is in conjunction with Chapter 13 (Exceptions) from the book How To Program in C++ by Deitle 4/e. I am at a total loss on this subject. I thought that catching problems was up to the compiler. I have included Figure 13.1 for an example as per instructions and some code I have been working on. Could someone please look this over and help me get my brain around exceptions or at least this project?
// Fig. 13.1: fig13_01.cpp
// A simple exception-handling example that checks for
// divide-by-zero exceptions.
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
#include <exception>
using std::exception;
// DivideByZeroException objects should be thrown by functions
// upon detecting division-by-zero exceptions
class DivideByZeroException : public exception {
public:
// constructor specifies default error message
DivideByZeroException::DivideByZeroException()
: exception( "attempted to divide by zero" ) {}
}; // end class DivideByZeroException
// perform division and throw DivideByZeroException object if
// divide-by-zero exception occurs
double quotient( int numerator, int denominator )
{
// throw DivideByZeroException if trying to divide by zero
if ( denominator == 0 )
throw DivideByZeroException(); // terminate function
// return division result
return static_cast< double >( numerator ) / denominator;
} // end function quotient
int main()
{
int number1; // user-specified numerator
int number2; // user-specified denominator
double result; // result of division
cout << "Enter two integers (end-of-file to end): ";
// enable user to enter two integers to divide
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 ÷ByZeroException ) {
cout << "Exception occurred: " <<
divideByZeroException.what() << endl;
} // end catch
cout << "\nEnter two integers (end-of-file to end): ";
} // end while
cout << endl;
return 0; // terminate normally
} // end main
Here is the instructions and code I'm trying to use.
/*Create a program that defines three user defined exception classes
(called ExceptionOne, ExceptionTwo, and ExceptionThree
- with the messages being the same as the name - see Figure 13.1 for an example).
The program should have a loop with a menu with four selections
- Option 1 will throw ExceptionOne, Option 2 ExceptionTwo, Option 3 ExceptionThree
, and Option 4 to exit.
The catch block should only catch the first two exceptions explicitly
with the last exception caught generically.
Make sure the switch logic is inside a try block followed by three catch blocks.
///////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <exception>
#include <ctime>
using std::cout;
using std::cin;
using std::endl;
class BaseException
{
public:
// constructor specifies default error message
ExceptionOne::BaseException ()
: ExceptionOne
}// end class
class ExceptionOne: public BaseException {
public:
ExceptionOne::ExceptionOne()
:ExceptionOne
}// end class
class ExceptionTwo: public ExceptionOne {
public:
// constructor specifies default error message
ExceptionTwo::ExceptionTwo()
: ExceptionTwo
} // end class
class ExceptionThree: public ExceptionTwo {
public:
ExceptionThree::ExceptionThree()
:ExceptionThree
}// end class
int main()
{
Any help greatly appreciated. Thanks
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