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FILE The name of the file which is to be associated with this unit. e1 and e2 Logical expressions Description You can make a series of independent tests, and each test can have its own sequence of statements. Action: may be left unchanged. To preserve error reporting, the system makes it an error to close logical unit 0, although it can be reopened to another file.

The named file does not exist. Regardless of the specified sta, scratch files, when closed, are always deleted. Example 2: Assign the statement number of a format statement:

INTEGER PHORMAT 2 FORMAT ( A80 ) ASSIGN 2 TO PHORMAT ... The general form of this statement is CLOSE(UNIT=integer-expression, control-list) The control-list is a set of keyword/value pairs which define the how the file is to be closed.

Real arrays: CHARACTER TTL*16 REAL VEC(5), PAIR(2) DATA TTL / 'Arbitrary Titles' /, & M / 9 /, N / 0 /, & PAIR(1) / 9.0 /, & VEC / BACKSPACE Statement If the program needs to re-read only the most recently read (or written) record, then the BACKSPACE statement can be used. Read statements can include END=n to branch on end-of-file. v Name of a symbolic constant, variable, array, array declarator, function, or dummy function c List of constants for the immediately preceding name Description This is a synonym for LOGICAL*1.

code here for to handle abnormal exit 456 CONTINUE C ... Status: Never standarized. This standard specifies: (1) The form of a program written in the FORTRAN language (2) Rules for interpreting the meaning of such a program and its data (3) The form of They open a data file, and read its contents from start to finish, processing the values as they are read, and writing results to an output file.

The FORTRAN Standard requires that actual arguments in a CALL statement must agree in order, number, and type with the corresponding formal arguments of the referenced subroutine. if the file has a name and .FALSE. We do not recommend using a BACKSPACE statement on a direct-access file or an append access file.

Execution of the BACKSPACE statement modifies the file position, as follows:

Prior Example Suppose we run the following short program: PROGRAM XAMPLE DOUBLE PRECISION D INTEGER I,J I = 1024*1024 J = -1 D = 10.0D0 OPEN(8,FILE='xample.out',STATUS='NEW',FORM='UNFORMATTED', $ ACCESS='DIRECT',RECL=16) WRITE(8,REC=1)I,J,D CLOSE(8,STATUS='KEEP') STOP 'End

An initial line is any line that is not a comment line and contains the character blank or the digit 0 in column 6. If the length of e is less than that of v, blank characters are padded on the right.

Record Assignment v and e are each a record or record field. The specified expression is evaluated. 2. In a program unit that contains an external function reference, the type of the function is determined in the same manner as for variables and arrays.

The signal that causes the abort is IOT. Perform I/O operation within bounds of the record; increase record length. 912 ERROR IN LIST I/O READ OF COMPLEX DATA While reading complex data, one of the following problems has occurred: The system returned: (22) Invalid argument The remote host or network may be down. Example: SUBROUTINE APROC(ARRAY) DIMENSION ARRAY(1) Status: commonly used in Fortran 66 at a time when compilers did not check array-bounds against the declared length, so the array size of the actual

The form of a basic real constant is an optional sign, an integer part, a decimal point, and a fractional part, in that order. Examples Example 1: Arrays in a main program: DIMENSION M(4,4), V(1000) ... A symbolic name that identifies a constant, variable, array, external function, or statement function may have its type specified in a type-statement (8.4) as integer, real, double precision, complex, logical, or An executable program is a collection of program units that consists of exactly one main program and any number, including none, of subprograms and external procedures. 2.5 Variable A variable is

R ) A(C,R) = 1 C = C - 1 END DO Example 2: A DOWHILE with a statement number: INTEGER A(4,4), C, R ... The length, len must be greater than 0. Note that a restriction in the evaluation of expressions (6.6) prohibits certain side effects. END In the above example, the formal arguments are an array, M, and a variable N.

For output, the formatting depends on the data type of the item and varies from system to system. The FORTRAN runtime system keeps track of file formats and access mode during runtimes. CHARACTER*(*) UPCASE(ARG) This does not do what it appears: the function always returns a string of 10 characters when called from this routine because of the declaration (but references to the Example 4: Quadruple complex, with initialization (SPARC, PowerPC only):

COMPLEX U*32 / (1.0Q0, 9 ) /, V*32 / (4.0, 5.0Q0) / COMPLEX*32 X / (1.0Q0, 9.0) /, Y /

In a function or subroutine, it has the effect of a RETURN. An integer datum has one numeric storage unit in a storage sequence. 4.3.1 Integer_Constant. Status: Never standardized, but in DEC Fortran and many others. Thus, a program unit consists of a totally ordered set of characters. 3.2.1 Comment_Line.

DO The DO statement repeatedly executes a set of statements. Action: No need to change, but the modern free-format layout has many advantages, and there are some free converters to this form, including Michael Metcalfe’s convert.f90 and Alan Miller’s to_f90.f90. This standard does not specify: (1) The mechanism by which programs are transformed for use on a data processing system (2) The method of transcription of programs or their input or The name of an array is a symbolic name. 2.6.1 Array_Elements.

They have the same structure if any of the following occur: Both e and v are fields with the same elementary data type. Both e and v are records with Add RECL specifier; specify ACCESS='SEQUENTIAL'. 930 OPEN WITH RECL LESS THAN 1 ATTEMPTED RECL specifier in OPEN statement was less than or equal to zero. Example 2: An adjustable array in a subroutine:

SUBROUTINE INV( M, N ) DIMENSION M( N, N ) ... The format value is traditionally listed second after the unit number.

Examples Example 1: A DO loop with a statement number: DO 10 N = 1, 100 ... 10 END DO Example 2: A DO loop without statement number: DO Any small positive integer expression. Such a datum may be identified, defined (2.11), and referenced (2.12). Action: Convert to an internal file read, e.g.

The name of an integer variable or array element within the same program unit. NAMELIST Internal Not allowed.