Why is there one more negative int than positive int?

Question

The upper limit for any int data type (excluding tinyint), is always one less than the absolute value of the lower limit.

For example, the

Answer 1

Let's say you have a 4byte (32 bit) integer. The range defined by C++ is -231 to 231-1. So we end up with a range -231.....0......231. We can think of this as having 231 non negative integers (note 0 is included) and 231 negative integers.