What is output?

public class MathOps $\{$

public static int divOp$($int num, int denom$)$ throws Exception $\{$

if $($denom $==0)\{$

throw new Exception$("$Invalid div input"$)$;

$\}$

return num $/$ denom;

$\}$

public static double sqrtOp$($double num$)$ throws Exception $\{$

if $($num $<0)\{$

throw new Exception$("$Invalid sqrt input"$)$;

$\}$

return Math.sqrt$($num$)$;

$\}$

public static void main$($String$[]$ args$)\{$

try $\{$

int x;

int y;

x $=4$;

y $=0$;

System.out.println$($divOp$($x$,$ y$))$;

System.out.println$($sqrtOp$(($double$)$y$))$;

$\}$

catch $($Exception excpt$)\{$

System.out.println$($excpt$.$getMessage$())$;

System.out.println$("$Cannot compute operation"$)$;

$\}$

$\}$

$\}$

a$.$

Invalid div input

Invalid sqrt input

b$.$

Invalid div input

Cannot compute operation

c$.$

Invalid div input

Invalid sqrt input

Cannot compute operation

d$.$

Cannot compute operation