Consider the program can potentially make mathematical run-time errors. Scenario

Question

Consider the program can potentially make mathematical run-time errors. Scenarios considered run-time errors include division and multiplication by zero, addition leading to a number greater than 255 and subtraction leading to a number less than 0

Define exception class with a private data member of type string that stores an error message that you’ll use in your catch block. The class also requires a parametrized constructor and an accessor function.

In main function ask the user to perform an operation (division, multiplication, addition, and subtraction), and for 2 integers to perform the operation

For each operation, check if an exception occurred and throw an object of your exception class to create a suitable message indicating what error has occurred. If no errors, calculate the appropriate result and display it. if-else or switch-case function may be used to branch between operation. Only one catch block may be used in code, which is designed to catch all 4 case errors. Let the user know which error occurred if one occurs.

Explanation / Answer

import java.util.*;

public class ExceptionClass

{

private String errorMessage="";

public static void main(String[]args)

{

Scanner scan=new Scanner(System.in);

System.out.println("YOU HAVE FOLLOWING CHOICES : ");

System.out.println("1. Addition");

System.out.println("2. Subtraction ");

System.out.println("3. Multiplication ");

System.out.println("4. Divison");

System.out.println("Enter your choice : ");

int choice=scan.nextInt();

//Taking or accepting inputs from the user(keyboard)

System.out.println("Enter First Number: ");

int a=scan.nextInt();

System.out.println("Enter Second Number ");

int b=scan.nextInt();

double result=0;//'result' will store the result of operation

try

{

switch(choice) //switch case used to branch between operation

{

case 1:

result=a+b;

if(result>255){System.out.println("Error");}//checks the result

System.out.println(result);

break;

case 2:

result=a-b;

if(result<0){System.out.println("Error");}

System.out.println(result);

break;

case 3:

if(a==0 || b==0){System.out.println("Error");} //Checks whether a or b is zero or not

else

{

result=a*b;

System.out.println(result);

break;

}

case 4:

result=a/b;

System.out.println(result);

default:

System.out.println("Wrong Choice");

}

}

catch(Exception e) //Catch block to catch the and throw which exception has occured

{

System.out.println(e);

}

}

}

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