# Fortran Array Assignment

The rules for construction of expressions (the syntax rules) are the same for user-defined operators as for intrinsic operators.

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When the operator is an intrinsic operator such as with two numeric operands means that the two operands are added together.

For the user-defined operators, the interpretation is provided by a user-supplied function subprogram with a designation that this subprogram is to be used to define the operation.

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.

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.Expressions often involve nonnumeric values, such as character strings, logical values, or structures; these also can be considered to be formulas that involve nonnumeric quantities rather than numeric ones.This chapter describes how valid expressions can be formed, how they are interpreted, and how they are evaluated.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 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.The MIPSpro Fortran Language Reference Manual, Volume 2, describes how any operator can be made generic by the programmer using a generic specifier on an interface block.The rules for interpretation of an expression are provided by the interpretation of each operator in the expression.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.

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