- nl
-
Write a newline character to the current output stream. On Unix systems
nl/0 is
equivalent to
put(10).
- nl(+Stream)
-
Write a newline to Stream.
- put(+Char)
-
Write Char to the current output stream, Char is
either an integer-expression evaluating to an ASCII value (0 =<Char
=< 255) or an atom of one character.
- put(+Stream, +Char)
-
Write Char to Stream.
- tab(+Amount)
-
Writes Amount spaces on the current output stream. Amount
should be an expression that evaluates to a positive integer (see
section 3.23).
- tab(+Stream, +Amount)
-
Writes Amount spaces to Stream.
- flush
-
Flush pending output on current output stream. flush/0
is automatically generated by read/1
and derivatives if the current input stream is
user and the
cursor is not at the left margin.
- flush_output(+Stream)
-
Flush output on the specified stream. The stream must be open for
writing.
- ttyflush
-
Flush pending output on stream user. See also flush/0.
- get0(-Char)
-
Read the current input stream and unify the next character with Char.
Char is unified with -1 on end of file.
- get0(+Stream, -Char)
-
Read the next character from Stream.
- get(-Char)
-
Read the current input stream and unify the next non-blank character
with Char. Char is unified with -1 on end of file.
- get(+Stream, -Char)
-
Read the next non-blank character from Stream.
- peek_byte(-Char)
-
Reads the next input character like get0/1,
but does not remove it from the input stream. This predicate is ISO
compliant.
- peek_byte(+Stream, -Char)
-
Reads the next input character like get0/2,
but does not remove it from the stream. This predicate is ISO compliant.
- skip(+Char)
-
Read the input until Char or the end of the file is
encountered. A subsequent call to get0/1
will read the first character after Char.
- skip(+Stream, +Char)
-
Skip input (as skip/1)
on Stream.
- get_single_char(-Char)
-
Get a single character from input stream `user' (regardless of the
current input stream). Unlike get0/1
this predicate does not wait for a return. The character is not echoed
to the user's terminal. This predicate is meant for keyboard menu
selection etc.. If SWI-Prolog was started with the -tty
option this predicate reads an entire line of input and returns the
first non-blank character on this line, or the ASCII code of the newline
(10) if the entire line consisted of blank characters.
- at_end_of_stream
-
Succeeds after the last character of the current input stream has been
read. Also succeeds if there is no valid current input stream.
- at_end_of_stream(+Stream)
-
Succeeds after the last character of the named stream is read, or
Stream is not a valid input stream.