Question

What the difference between two postive integers is always a negative or positive?

Answer 1

The difference between two negative integers can be positive, negative or zero depending upon the values of theintegers. When you subtract two negative integers and the first integer(or minuend) is smaller than the second integer (or subtrahend), thedifference is negative
The only difference between the set of positive integers and the set of nonnegative integers is the inclusion of zero in the set of nonnegative integers. Zero is neither a positive number nor a negative number. It is considered a rational number, an even number and a real number