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 Operator precedence table
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 Operator type            Operators                       Evaluation
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 Unary operators          +, -                            Right to left
 Binary operators         *, /, %, **, +, -               Left to right
 Relational operators     <, >, <=, >=, ==, =, !=, <>     Left to right
 Logical operators        .not., .and., .or.              Left to right
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 The table shows that the unary operators, sign plus + and sign negation -
 are the first expressions to be evaluated. Next come the mathematical and
 character binary operators. Multiplication *, division /, modulus % and
 exponentiation ** are evaluated before addition + and subtraction -.

 Following the mathematical and character binary operators in precedence are
 the relational operators. The less than and greater than (and their
 corresponding =< >= operators) are evaluated before the equality =, == and
 inequality <>, != operators. Finally, of the logical operators, .not. is
 evaluated before .and. which is evaluated before .or.