Computers also do a simple and primitive type of logic called Boolean Logic, the idea of True and False, or 1(sometimes -1) and 0. The True and False are used as words, more like values, in the script, like this: A = True.  It understands it this way and processes it with a few special commands, called operators:  AND, OR, XOR, NOT, =, <>, <, >,<=, >=

AND will return true only if both values are true:

True AND True is True
True AND False is False
False AND False is False

OR will return true only is on value is true:

True OR True is True
True OR False is True
False OR False is False

XOR operator is used to perform a logical exclusion on two expressions, they return True only when the two part disagree:

True XOR True is False
True XOR False is True
False XOR True is True
False XOR False is False

NOT just reverses the ideas; this one's simple:

NOT True is False
NOT False is True

The previous words work only on the level of True and False, but there are logical words for testing numbers.

= for equals to, returns True if both values are alike:

3 = 5 is False
4 = 4 is True
5 = 3 is False

<> for not equal to, returns True if both values are unlike:

3 <> 5 is True
4 <> 4 is False
5 <> 3 is True

< for less than, returns True if the first value is lower than the second:

3 < 5 is True
4 < 4 is False
5 < 3 is False

<= for less than or equal to, returns True if the first value is lower than or the same as the second:

3 <= 5 is True
4 <= 4 is True
5 <= 3 is False

> for greater than, returns True if the first value is higher than the second:

3 > 5 is False
4 > 4 is False
5 > 3 is True

>= for greater than or equal to, returns True if the first value is higher than or the same as the second:

3 >= 5 is False
4 >= 4 is True
5 >= 3 is True

By: Matthew Holder