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Extensions
To
ANSI
Fortran
D-2
0.3
More Specific Semantics Than 1977 FORTRAN
In the following areas, the definition
of
FORTRAN-80
is
more
explicit
than
the AN-
SI
standard.
1.
The
character set
and
its collating sequence include the ASCII
character
set.
2.
The
standard
length for real, integer,
and
logical type
data
is
four
bytes, but a
particular processor can allow a different default size to be specified.
0.4 Differences From 1966 FORTRAN
The
following lists summarize differences between 1966 ANSI
FORTRAN
and
FORTRAN-80.
Most differences represent additions to 1966
FORTRAN
(except
where indicated
by
an
asterisk).
Data
types:
Character
constants, variables,
and
arrays
*No double precision constants, variables, arrays,
or
format
specifiers
*No complex constants, variables, arrays,
or
format
specifiers
Binary, octal,
and
hexadecimal notations for integer constants
Statements:
PROGRAM
statement
BLOCK
DATA
statement with a
subprogram
name
END
statement with a label
IMPLICIT
statement
INTRINSIC
statement
SA
VE statement
Block
IF
THEN,
ELSE
IF, ELSE,
END
IF
PRINT
statement
OPEN
and
CLOSE
statements
CHARACTER
type statement
INTEGER
and
LOGICAL
type statements with length specifications
Input/Output:
*No G edit descriptor
Control
information
list in
READ,
WRITE,
BACKSPACE,
ENDFILE,
and
REWIND
statements
Asterisk as a unit identifier; character arrays
and
variables as internal units; in-
teger expressions for external units
General expressions
in
WRITE,
PRINT
List-directed
110
(asterisk as format)
Character
expression as format; Hollerith value in arithmetic
array
as
format
identifier
Edit descriptors
BZ; BN, Ew.dEc
j
$, Bw, Zw
General integer expressions in implied
DOs
Expressions
Bit-wise Boolean
operations
on
integers
.NEQV.
and
,EQV.logical
operators
Character
expressions in assignments,
output,
relationals, and
procedure
arguments
FORTRAN-SO