Simple Exception-Handling Example: Divide by Zero

• Keyword throw
  • Throws an exception; Use when error occurs
  • Can throw almost anything (exception object, integer, etc.); throw myObject;, throw 5;
• Exception objects
  • Base class exception ( $<$exception$>$ )
  • Constructor can take a string (to describe exception)
  • Member function what() returns that string
• Upcoming example
  • Handle divide-by-zero errors
  • Define new exception class
    • DivideByZeroException
    • Inherit from exception
  • In division function
    • Test denominator
    • If zero, throw exception (throw object)
  • In try block
    • Attempt to divide
    • Have enclosing catch block; Catch DivideByZeroException objects

Figure 1: Exception-handling example that throws exceptions on attempts to divide by zero. (Part 1 of 2)

Figure 2: Exception-handling example that throws exceptions on attempts to divide by zero. (Part 2 of 2)