Mark Wickens

EOF

Purpose

Indicates the end of file reading.

Format

EOF     ( file number )
          └────┬────┘
      Numeric expression

Example

IF EOF(1) THEN END

Parameters

file number: Numeric expression truncated to an integer in the range of 1 ≦ file number < 2

Explanation

1. Indicates the end of reading for a file specified by the file number. Generally, this function is assigned a value of 0, but the value becomes -1 when the last record ofa file is read.
2. A value of -1 is returned when the receive buffer (for RS-232C application) becomes empty.
3. This statement is valid for sequential files opened for input (FOR INPUT) and for communications circuits (COM0:) input/output files.
4. Generally, a 0 is returned for sequential files opened for output (FOR OUTPUT).

Sample Program

10  OPEN "CAS0:TEST" FOR INPUT AS #1
20  INPUT #1, A$
30  PRINT A$
40  IF NOT EOF(1) THEN 20
50  CLOSE
60  END

Reads and displays data in sequential file on cassette tape until no more data remain.