Fortran Array Assignment

The formal (BNF) rules for forming expressions imply an order for combining operands with operators.These rules specify that expressions enclosed in parentheses are combined first and that, for example, the multiply operator , respectively.

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The following example shows an assignment statement: . Fortran has expressions of other types, such as logical, character, and derived type.

Values of expressions of these other types can be assigned to variables of these other types.

In Fortran, calculations are specified by writing expressions.

Expressions look much like algebraic formulas in mathematics, particularly when the expressions involve calculations on numerical values.

This chapter describes using arrays and pointers in the following contexts: The result obtained from the evaluation of an expression can be used in many ways.

For example, it can be printed or passed to a subprogram.

These capabilities are provided within the general framework for expressions, which consists of three sets of rules: An expression is formed from operators and operands.

There is no change from FORTRAN 77 in the rules for forming expressions, except that a new class of operators has been defined.

In many cases, however, the value is assigned to a variable and that value can be used later in the program by referencing the variable.

Execution of the assignment statement causes the expression to be evaluated (by performing the computation indicated), and then the value of the expression is assigned to the variable on the left of the equal sign.


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