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>` and does the following

- Decomposes it into three digits,
`digit1, digit2`and`digit3`. - Using
`Math.max()`and`Math.min()`determines the digits with the maximum and minimum value and assign them to`maxDigit`and`minDigit`respectively. - Using Prog9.java from OCT 4, 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.