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APPENDIX A
FORTRAN-80 STATEMENT SUMMARY
A.1
Statement Sequence
The
following
order
of
statements
and
lines
must
be observed when coding a
FORTRAN
program.
1.
Comment
lines can
appear
before
or
between statements,
but
cannot
appear
after
an
END
statement.
2.
The
PROGRAM
statement,
if
used,
must
be the first
statement
of
a
main
program.
The
first
statement
of
a
subprogram
must
be a
FUNCTION,
SUBROUTINE,
or
BLOCK
DATA
statement.
Within
a
program
unit
that
permits the following statements:
3.
FORMAT
statements
can
appear
before
the
END
statement.
4.
IMPLICIT
statements
must
precede all
other
specification statements.
5. All specification statements must precede all
DATA
statements, which
must
precede
statement
function statements, which
must
precede all executable
statements.
6.
The
last line
of
a
program
unit
must
be
an
END
statement.
These rules
are
summarized
in Figure 1-2.
A.2 Statement Summary
In the following
summary,
any
format
item enclosed in
square
brackets
is
optional.
Ellipses indicate the preceding item can be repeated indefinitely (within
statement
length limits).
ASSIGN
Statement
Category: Executable
Text Reference: Section
3.3.4
Format
Function
ASSIGN
stl
TO
name
Assign statement label ' stl'
to
integer variable
'name.'
Assignment
Statement
Category: Executable
Types:
Arithmetic,
Character,
Logical
Text Reference: Sections
3.3.1,3.3.2,3.3.3
Format
Function
v = e
Assign value
of
'e'
to
'v,'
where
'v'
is
type
integer, real,
logical,
or
character.
A-l