*In this chapter, however, certain terms from the standard have been changed to improve clarity.*Fortran allows you to define data types, operators for these types, and operators for intrinsic types.

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.

The four forms of the assignment statement are also described in this chapter.

Note: : The Fortran statement syntax in this manual is defined using the same terms used in the Fortran standard.

The formation rules for expressions imply that the defined unary operators have highest precedence of all operators, and defined binary operators have the lowest precedence of all operators.

When they appear in a context where two or more of these operators of the same precedence are adjacent, the operands are combined with their operators in a left-to-right manner, as is the case for the familiar operates on operands of type integer as well as real and complex.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.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.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.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.Thus, a compiler has a great deal of freedom to rearrange or optimize the computation, provided the rearranged expression has the same mathematical meaning.Arrays and pointers as objects can appear in expressions and assignment statements.

## Comments Fortran Array Assignment

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The fourth statement uses random as an array of indices and assigns the value of 0.0 to the array elements of a. Fortran 90 allows arrays to have zero size.…