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An
analysis of the
program
will
help
you
understand
how
it
works.
Line No.
Explanation
10-40
Four
logical
files
are
opened
to
the
printer
so
that
the data
in
the
computer's
memory
can be used
in
four
different
ways:
Logical
Secondary
File
No.
Address
Usage
1
(default)
Print
data exactly as
transmitted.
2
1
Format
data before
it
is
printed.
3
2
Transmit
the format
string.
4
4
Enable format
error
diagnostic
messages
to
be
printed
(if
any).
50
Prints error
messages
(if
any)
60
Defines the format
string
70
Defines the data
string
80
Prints
the format
string
90
Prints
the
unformatted data
string
100
Transmits
the
format
string to
the
printer's
memory
110
Skip
a
space
120
Prints
the formatted data
string
130
Transfers
control
from
the
computer
to
the
printer
140
Prints
four blank
lines
150
Lists
the
program
A-3
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