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class RevDemo { int reverseNumber(int num) { int reversed = 0; while (num > 0) { int digit = num % 10; reversed = reversed * 10 + digit; num /= 10; } return reversed; } } public class Main { public static void main(String[] args) { RevDemo d=new RevDemo(); int reversed = d.reverseNumber(12345); System.out.println(reversed); } }reversed will be 54321