OPERATOR RANK DESCRIPTION ** 1 exponentiation (evaluated right to left) * 2 multiplication / 2 division + 3 addition - 3 subtraction
You can use parentheses to force an order of evaluation.
Character
Character expressions consist of character elements and character
operators. Evaluation of a character expression yields a single
value of character data type. A character element can be a
constant, variable, record element, array element, substring,
expression (optionally enclosed in parentheses), or a function
reference.
A character expression has the form:
character element[//character element]...
The concatenation operator (//) is the only character operator.
Concatenation is from left to right.
Logical
Logical expressions can contain logical and integer data such as
variables, record elements, array elements, constants, function
references, expressions enclosed in parentheses, and relational
expressions. The expression evaluates to a logical value using the
following operators:
OPERATOR PRECEDENCE
** First (Highest)
*,/ Second
+,-,// Third
Relational
Operators Fourth
.NOT. Fifth
.AND. Sixth
.OR. Seventh
.XOR. Eighth (Lowest)
.NEQV. Eighth
.EQV. Eighth
Relational
Relational expressions consist of either two arithmetic or two
character expressions separated by relational operators. The
expression is reduced to a logical value (true or false).
OPERATOR DESCRIPTION .LT. Less than .LE. Less than or equal to .EQ. Equal to .NE. Not equal to .GT. Greater than .GE. Greater than or equal to
Expressions of COMPLEX data type can use only .EQ. and .NE. operators.