How do you fix this code snippet to make it print out the sum when the user enters a letter rather than a double? The user must enter at least one double when the program begins.

System.out.print$("$Enter a value: $")$;

double sum $=0$;

Scanner in $=$ new Scanner$($System$.$in$)$;

boolean hasData $=$ true;

do

$\{$

double value $=$ in$.$nextDouble$()$;

sum $=$ sum $+$ value;

System.out.print$("$Enter a value to add, or a letter to quit: $")$;

$\}$

while $($in$.$hasNext$())$;

System.out.println$("$sum $"+$ sum$)$;

Question $7$ options:

while $($in$.$hasData$())$;

while $(!$in$.$hasEnded$())$;

while $($in$.$hasNextDouble$())$;

while $($hasData$)$;