seen/0
seen
Close input file.
Remarks
Closes the input file and attaches the output stream to stdin.
Example
tell("dd.txt"), write("line 1\n"), write("line 2\n"), write("line 3\n"), told, see("dd.txt"), readln(Str1), seen, display(Str1).
write("line 1\n"),
write("line 2\n"),
write("line 3\n"),
told,
see("dd.txt"),
readln(Str1),
seen,
display(Str1).