You can extract the rightmost digit from an integer number by taking the remainder of the integer after it is divided by 10. For example, 1234 % 10 gives the value 4, which is the rightmost digit of 1234 and is also the first digit of the reversed number. (Remember that the modulus operator gives the remainder of one integer divided by another.) You can get the next digit of the number by using the same process if you first divide the number by 10, bearing in mind the way integer division works. Thus, 1234 / 10 gives a result of 123, and 123 % 10 gives you 3, which is the next digit of the reversed number.