Vector Basic Interpreter Basic 80, Reference Manual, Page: 145 / 190

Now look at Program B-2. It accesses the file "DATA" that
was created in Program B-1 and displays the name of everyone
hired in 1978.
10 OPEN "I",t1,"OATA"
20 INPUTt1,N$,D$,H$
30 IF RIGHT$ (H$,2).n7S" THEN PRINT N$
40 GOTO 20
RUN
EBENEEZER SCROOGE
SUPER MANN
Input past end in 20
Ok
Program B-2 reads, sequentially, every item in the file.
When all the data has been read, line 20 causes an "Input
past end" error. To avoid getting this error, insert line
1S which uses the EOF function to test for end-of-file:
A program that creates a sequential file can also write
formatted data to ~~e disk with the PRINT# USING statement.
For example, the statement
PRINT#1,USING"#ttt.tt,";A,B,e,o
could be used to write numeric data to disk without explicit
delimiters.
The comma at the end of the format string
serves to separate the items in the disk file.
The Loe function, when used with a sequential file, returns
the number of sectors that have been written to or read from
the file since it was OPENed.
A
sector is a 128-byte block
of data.
B.3.1.1 Adding
~!£ ~
Seauential File -
If you have a sequential file residing on disk and later
want to add more data to the end of it, you cannot simply
open the file in "0" mode and start writing data. As soon
as you open a sequential file in "0" mode, you destroy its
current contents. The following procedure can be used to
add data to an existing file called "~AMES".