Program to extract individual digit from a 4 digit number using loop

Question

can someone tell me logic

Answer 1

for(int i=0;i<4;i++){
str.charAt(i);

Answer 2

turn into a string.Index desired digit.Turn into a int again

You can use Integer.toString() and Integer.parseInt()

Answer 3

use a while loop till no. is greater than 0.
in loop: remainder= n% 10
print (remainder)
n = n/10
or you can store these remainders in an array to get in using index value.