Question

We want to implement a method that reverses the digits in an integer. How can we achieve this?

Answer 1

To reverse the digits in an integer, initialize a reversed number variable, loop over the original number to extract and remove digits, and build the reversed number by multiplying it by 10 and adding the extracted digit. Repeat until all digits are processed.

Step-by-step explanation:

To implement a method that reverses the digits in an integer, you can follow these steps:

1. Initialize a variable to hold the reversed number. Set it to 0 initially.
2. Use a loop to take each digit from the original number. This can often be done using a modulo operation to get the last digit and an integer division to remove the last digit from the number.
3. Multiply the reversed number by 10 and add the last digit to it. This shifts the digits in the reversed number one place to the left and adds the new digit.
4. Repeat this process until the original number has no more digits left.

For example, if the original number is 1234, you would:

• Take 4 out using 1234 % 10 (which equals 4)
• Reduce 1234 to 123 by integer division by 10 (1234 / 10 = 123)
• Add 4 to the reversed number, which is 0 * 10 + 4 = 4 and so on.

The reversed number would then be built as 4, then 43, then 432, and finally 4321.