Java Taskbook Level 5.4

Задание 1

Given some integer:

javaint num = 12345;

Check that the digits of this number are in ascending order.

Задание 2

Given some array:

javaint[] arr = {123, 456, 789};

Get an array of the first digits of the numbers in the first array:

javabyte[] {1, 4, 7};

Задание 3

Create the following array using loops:

javachar[] {
  {'x', 'x', 'x'},
  {'x', 'x', 'x'},
  {'x', 'x', 'x'},
}