listing 9.5, calculator.java, is a simple commandline calculator
listing 9.5, calculator.java, is a simple commandline calculator. note that the program terminates if any operand is nonnumeric. write a program with an exception handler that deals with nonnumeric operands; then write another program without using an exception handler to achieve the same objective. your program should display a message that informs the user of the wrong operand type before exiting (see figure 13.6).
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