Intel fortran-80 manual Order of Statements

Introduction To FORTRAN FORTRAN-SO

1.2.3 Order of Statements

The following order must be observed in coding FORTRAN statements lines:

1.Comment lines can appear before or between statements. They cannot appear after the END statement.

2.The PROGRAM statement can appear only as the first statement of a main program. FUNCTION, SUBROUTINE, and BLOCK DATA can appear only as the first statement of a subprogram (Section 2.1.1).

3.FORMAT statements can appear anywhere before the END statement.

4.IMPLICIT statements must precede all other specification statements.

5.All specification statements (lists 1 and 2 in section 1.2.2) must precede all DATA statements, which must precede all statement function statements, which must precede all executable statements.

6.The last line of a program unit must be the END statement.

The rules for ordering FORTRAN statements are summarized in Figure 1-2.

PROGRAM, FUNCTION, SUBROUTINE, or BLOCK DATA

Statement

			IMPLICIT Statements
Comment	FORMAT		Other Specification
Lines	Statements		Statements
			DAT A Statements
			Statement Function
			Statements
			Executable Statements
		END Statement
	Figure 1-2. Order of FORTRAN Statements

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