arithmetic and logical operator in fortran

exponentiation **, right-to-left associativity

-2**2**3
same as
-2**(2**3)

unary operator, + for positive and - for negative

+3
+3.1
-5
-0.5

multiplication * and division /

4/2
4*2
4.3*1.1
-5/2.5

addition + and subtraction -

4*5+3
4-5

comparison

logical negation

 .not.

logical and

 .and.

logical or

 .or.