13.1* ( NumberFormatException ) Listing 9.5 , Calculator.java, is a simple comma

Question

13.1*

(NumberFormatException) Listing 9.5, Calculator.java, is a simple command-line 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).

Calculator.java, is a simple command-line 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).

Explanation / Answer

With exception handler

import java.util.InputMismatchException;

import java.util.Scanner;

public class Calculator {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

String option;

do{

try{

System.out.println("****Welcome to calculator*******");

System.out.print("Enter first number:: ");

int first = in.nextInt();

System.out.print("Enter the operator('+','-','*' or '/')::");

String operator = in.next();

System.out.print("Enter second number");

int second = in.nextInt();

double result = 0;

if(operator.equals("+")){

result = first+second;

}

else if(operator.equals("-")){

result = first-second;

}

else if(operator.equals("*")){

result = first*second;

}

else if(operator.equals("/")){

result = first/second;

}

String resultFormatted = String.format("%.2f",result);

System.out.println("Result for "+first+operator+second+" = "+result);

}

catch(InputMismatchException e){

System.err.println("Non numeric value entered");

System.exit(0);

}

System.out.println("Do you want to continue?(Y/N)");

option = in.next();

}

while(option.equalsIgnoreCase("Y"));

in.close();

}

}

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