Replace all 0's with 5 || i wrote code but its not working expected| o/p is in reverse order

Question

Problem: Given a number N. The task is to complete the function convertFive() which replace all zeros in the number with 5 my code| plz validate any help me

public class Replaceall0swith5 {
    public static void convertFive(int n) {
    //add code here.
        int digit, sum = 0;
        while (n > 0) {
            digit = n % 10;
            if (digit == 0) {
                digit = 5;
            }
            sum = sum * 10 + digit;
            n = n / 10;
        }
        System.out.print(n + " All O's replaced with 5 " + sum);
    }

    public static void main(String[] args) {
        Replaceall0swith5.convertFive(1004);
    }
}

Answer 1

Try this.

public static void convertFive(int n) {
    int sum = 0;
    for (int rank = 1; n > 0; n = n / 10, rank *= 10) {
        int digit = n % 10;
        if (digit == 0)
            digit = 5;
        sum = sum + digit * rank;
    }
    System.out.print(n + " All O's replaced with 5 " + sum);
}

n	digit	rank	sum
1004		1	0
100	4	1	4
10	0 -> 5	10	54
1	0 -> 5	100	554
0	1	1000	1554