Evaluation Precedence and Associativity

Items appearing in expressions are evaluated in the following order (highest precedence first):

• Constants and variables

• Function arguments and parenthesised expressions

• Function invocations

• Unary $+$ - ! .not.

• $*$$*$

• $*$ /

• $+$ -

• $<$$<$ $>$$>$

• $<$ .lt. $<$= .le. $>$ .gt. $>$= .ge.

• == .eq. != .ne.

• &

• $\wedge$

• $\vert$

• && .and.

• $\wedge$$\wedge$

• $\vert$$\vert$ .or

• .eqv. .neqv. .xor.

All operators associate from left-to-right, except for unary $+$, unary -, !, .not. And $*$$*$ which associate from right-to-left.