Character I/O

nl

A new line character is sent to the current output stream.

nl(+Stream)

A new line character is sent to the designated output stream.

get0(?N)

N is the ASCII code of the next character read from the current input stream. If the current input stream reaches its end of file, a -1 is returned

Compatibility Note: Unlike other Prologs, such as C-Prolog, the input stream is not closed on encountering the end-of-file character.

get(?N)

N is the ASCII code of the next non-blank printable character from the current input stream. It has the same behaviour as get0/1 when an end of file character is encountered.

Compatibility Note: Unlike other Prologs, such as C-Prolog, the input stream is not closed on encountering the end-of-file character.

put(+N)

Puts the ASCII character code N to the current output stream.

Exceptions:

instantiation_error

N is not instantiated at the time of the call.

type_error

N is not an integer at the time of the call.

tab(+N)

Puts N spaces to the current output stream.

Exceptions:

instantiation_error

N is not instantiated at the time of the call.

type_error

N is not an integer at the time of the call.