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Integers are whole numbers and negative numbers without fractions or decimal parts. The following are some examples of integers and non-integers.
| Integers | Non-integers |
|---|---|
| 17, 0, -1, 121, -67 | π, -3/4, 1.5, -12.9, 1/2 |
An integer can be positive, negative or zero. The set of all integers is denoted by Z.
Z={...- 2, - 1, 0,1,2...}
The dots indicate that the set continues to increase or decrease by one unit at a time indefinitely. An example of the use of integers is to represent temperatures below zero. One of the lowest temperatures recorded on earth was about -89^(∘) C.