Modify any of the previous labs which would have crashed when non-numeric data was entered by adding exception handling so that the non-numeric input no longer crashes the program. The program must handle the invalid input gracefully by informing the user of the bad input and re-querying until the user provides valid input. It must re-query for the specific input which was incorrectly entered.

see explaination

Explanation:

import java. util. InputMismatchException;

import java. util. Scanner;

public class calculate {

static float a=0, b=0;

double cal ()

{

if (a==0||b==0)

{

System. out. println ("no values found in a or b");

start ();

}

double x = (a*a) + (b*b);

double h=Math. sqrt (x);

a=0;

b=0;

return h;

}

float enter ()

{

float val=0;

try

{

System. out. println ("Enter side");

Scanner sc1 = new Scanner (System. in);

val = sc1. nextFloat ();

return val;

}

catch (InputMismatchException e)

{

System. out. println ("Enter correct value");

}

return val;

}

void start ()

{

calculate c=new calculate ();

while (true)

{

System. out. println ("Enter Command");

Scanner sc = new Scanner (System. in);

String input = sc. nextLine ();

switch (input)

{

case "A":

a=c. enter ();

break;

case "B":

b=c. enter ();

break;

case "C":

double res=c. cal ();

System. out. println ("Hypotenuse is : "+res);

break;

case "Q":

System. exit (0);

default:System. out. println ("wrong command");

}

}

}

public static void main (String[] args) {

calculate c=new calculate ();

c. start ();

}

}