Homework 5, assigned WED NOV 1 and part A is due MON NOV 13 at 11:59pm, part B is due WED NOV 15 at 11:59pm

### Part A

Write a program in which the main method calls a method with the heading public static int subtract(int num) that takes a three digit integer num, for instance 123, and does the following

• Decomposes it into three digits, digit1, digit2 and digit3. One of the ways you can do this is by using String s = "" + num, and then use s.charAt(0), s,charAt(1), s.charAt(2) to gets the digits.
• Using Math.max() and Math.min() determines the digits with the maximum and minimum value and assign them to maxDigit and minDigit respectively.
• Using Max3.java from OCT 31 or Nov 1, determines the middle digit and assigns it to midDigit.
• Constructs an integer, ascend in which these digits appear in ascending order. For instance, if the original value of num was 673, the constructed integer would be 367.
• Repeats the last step but this time produces the digits in descending order. So in our example, it would produce 763. It assigns this to descend.
• Prints these two values.
• Subtracts these two numbers (descend - ascend) and returns this value in the method.

### Part B

• Write another program that calls method subtract defined in part A from the main method until the method returns a value that doesn't change, i.e., 495. Try the following approach. Before the loop assign 123 (or any other 3-digits number different from the one we describe next) to "previous" and 149 (or another 3-digit number in which all the digits are different) to "present". Then construct the while loop as:
```while( previous != present)
{
previous = present;
= subtract(...);
}
```