###### Exercise21

Give examples of each type of number. If no such number exists, enter `DNE`

or `NONE`

.

Give an example of a whole number that is not an integer.

Give an example of an integer that is not a whole number.

Give an example of a rational number that is not an integer.

Give an example of a irrational number.

Give an example of a irrational number that is also an integer.