Demonstrating Exception Handling

Figure 17.2 uses exception handling to wrap code that might throw a DivideByZeroException and to handle that exception, should one occur. The user enters two integers, which are passed as arguments to function quotient (lines 10–18). This function divides its first parameter (numerator) by its second parameter (denominator). Assuming that the user does not specify 0 as the denominator for the division, function quotient returns the division result. If the user inputs 0 for the denominator, quotient throws an exception. In the sample output, the first two lines show a successful calculation, and the next two show a failure due to an attempt to divide by zero. When the exception occurs, the program informs the user of the mistake and prompts the user to input two new integers. After we discuss the code, we’ll consider the user inputs and flow of program control that yield these outputs.