Exceptions

	Exceptions
	Default Behavior
	Exceptions as Contract Violations
	Failures of Preconditions
	Failures of Postconditions
	Robustness
	Who is in Charge?
	How to Pass Informations about the Problem?
	The Base Class for Exceptions
	Exceptions in Signatures
	Defining Exceptions
	Throwing Exceptions
	Calculator Example
	Calculator Exceptions
	Exception Handling of the Calculator
	Inner Core of the Calculator Loop
	Using the Calculator
	Running the Calculator