They include in integers....
the following are include in the integers
1.positive numbers ( all positive number like 1,2,3,4,5,6,7,8,9 and so on)
2.negative numbers ( all negative numbers like -1,-2,-3,-4,-5,-6,-7,-8,-9 and so on)
>>Hope it helps..
dont copy my answer or delete it is originally based it on my mind!!