EOF Function

EOF(integer-variable)

Returns TRUE (1) if the end of file has been reached on the file handle, otherwise FALSE (0). The parameter must be an integer variable containing a valid handle from OPENIN or OPENOUT (for append/verify cases).

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Examples

REM Read a text file line by line
FH = OPENIN("mytext.txt")
IF FH < 0 THEN
    PRINT "Could not open file"
    END
ENDIF
 
REPEAT
    line$ = READ$(FH)
    IF EOF(FH) = 0 THEN
        PRINT line$
    ENDIF
UNTIL EOF(FH) = 1
 
CLOSE FH

REM Copy a file (simple text mode)
IN  = OPENIN("input.txt")
OUT = OPENOUT("output.txt")
IF (IN < 0) OR (OUT < 0) THEN
    PRINT "Open failed"
    END
ENDIF
 
REPEAT
    L$ = READ$(IN)
    IF EOF(IN) = 0 THEN
        WRITE OUT, L$
    ENDIF
UNTIL EOF(IN) = 1
 
CLOSE IN
CLOSE OUT

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Notes

• EOF reports whether the next read would be past the end. After a final READ$, it becomes TRUE.
• Typical pattern: read with READ$, process if EOF(FH)=0, loop until EOF(FH)=1.
• On failure to open, file handles are negative; check before use.
• Works with file handles from OPENIN (reading). For writing with OPENOUT, EOF is generally not meaningful.

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See also: OPENIN · OPENOUT · READ$ · WRITE · CLOSE