Is there the largest positive number and the smallest negative number in rational numbers? Are there the largest negative integers and the smallest positive integers in rational numbers? If so, please write them out Please give an example

Is there the largest positive number and the smallest negative number in rational numbers? Are there the largest negative integers and the smallest positive integers in rational numbers? If so, please write them out Please give an example

yes , we have
The largest negative integer is - 1
The smallest positive integer is 1