Statements

All HP Fortran statements are fully described in alphabetical order in Chapter 10, “HP Fortran Statements.”

The required order for statements in a standard Fortran 90 program unit is illustrated in Table 2-2 “Statement order in a program unit”. Vertical lines separate statements that can be interspersed, and horizontal lines separate statements that cannot be interspersed. For example, the DATA statement can appear among executable statements but may not be interspersed with CONTAIN statements. Also, the USE statement, if present, must immediately follow the program unit heading.

Table 2-2 “Statement order in a program unit” does not show where comments, the INCLUDE line, and directives may appear. Comments may appear anywhere in a source file, including after the END statement. The INCLUDE line may appear anywhere before the END PROGRAM statement.

Table 2-3 “Statements allowed in scoping units” identifies which statements may appear within a scoping unit; a check mark indicates that a statement is allowed in the specified scoping unit. For the purpose of this table, type declarations include the PARAMETER statement, the IMPLICIT statement, type declaration statements, derived-type definitions, and specification statements.