The following code containing a loop attempts to find how many times the letter ‘r’ appears in a string. But something is wrong with the loop. How would you fix it?

String s = “railroad”;
int count = 0;
char letter = s.charAt(index);
for (int index = 0; index < s.length(); ++index)
if (letter == ‘r’)
++count;

The assignment to letter needs to be moved down into the loop right before we check to see if the letter
is an r.