Note

1. Whole Numbers (include zero)

     For example:
     0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ...


2. Counting Numbers (not include zero)

     For example:
     1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ...

     That means, we would not count ZERO if we need to do counting.


3. Integers

     They can be zero, negative (-ve) or positive (+ve) numbers without decimal place.

     For example:
     -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ...