Web Reference: In this program, you'll learn to reverse a number using a while loop and a for loop in Java. Jul 23, 2025 · In Java, reversing a number means that the digit at the first position should be swapped with the last digit, the second digit will be swapped with the second last digit, and so on, till the middle element. reversed = reversed * 10 + digit; . num /= 10; } System.out.println("Reversed: " + reversed); Explanation: We start with the number 1234. Inside the loop: - num % 10 gives us the last digit (4, then 3, then 2, then 1). - We add this digit to reversed, making the new number grow step by step.
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