Commodore PET User Manual page 262

Sample Program
This sample program will demonstrate how to write complex records of data
to a data tape, where the format of the data is specified by the programmer. The
new program MAIL.PRINT# will print a mailing list named MAIL anto a data tape.
MAIL will later be read by another program called MAIL.lNPUT#. MAIL is similar
to the address book previously discussed, except that MAIL contains ail the
names and addresses from A to Z. Each name and address, along with the record
number. makes up a record of the mailing list.
•• RECORD #6..
j
WIDGETS SUPPLY CO.
555 BOGUS AVE. one record
GERTIE
TENNESSEE 38901
At this point. the total number of records in the file is unknown. Each record
is formatted to contain five fields: 1) record number, 2) name, 3) street address, 4)
city, 5) state and ZIP code.
•• RECORD #6 •• field 1
WIDGETS SUPPLY CO. field 2
555 BOGUS AVE. field 3
GERTI E field 4
TENNESSEE 38901 field 5
Of course, this is not what the data actually looks like on the data tape, but
only how it has been arranged on the screen. The data on the tape is not written in
English, but for purposes of demonstration it will be pictured as such. Below is an
illustration of how record #6 appears on the tape.
<CR>RECORD *6 <CR> WIDGETS SUPPLY CO. <CR>
l
' ' - . . . - -. . . .
' V~--,,,.~
field 1
555 BOGUS AVE. <CR> GERTIE <CR> TENNESSEE
t6
38901 <CR>
'--
-~
-
J'
~
\"
-
v ~
"
. 1
field 2 field 3 field 4
1
1·
one record
The program statements to read and print the data read from the tape determine
how the data appears on the screen.
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