Define the fields for a data file.
The FIELD statement specifies the field width and field variable for each field in the data file.
Set fileno to the value specified when opening the data file.
private SNO$ private QTY$ private BARDATA$ open "TESTDATA.DAT" as #1 field #1, 3 as SNO$, 5 as QTY$, 13 as BARDATA$