== equality Usage: x == y evaluates to false, 0, or true, non0
!= inequality Usage: x != y evaluates to false, 0, or true, non0
> greater than
< less than
>= greater than or equal to
<= less than or equal to

Operator precedence and associativity

operator associativity
( ) left to right
* / % left to right
+ - left to right
< <= > >= left to right
== != left to right
= right to left
Important. Note that multiplication and division have higher
precedence than addition and subtraction. These four operators also
associate left to right. The assignment (=) is an operator too; it
associates right to left.