[ Character I/O | Reference Manual | Alphabetic Index ]

get(+Stream, -Ascii)

Reads the next character from the input stream Stream and unifies its ASCII code with Ascii.
Stream
Integer (stream number) or Atom (reserved or user-defined symbolic stream name).
Ascii
Variable or integer.

Description

Takes the next character from the open input stream Stream and unifies its integer ASCII code (in the range 0 to 255) to Ascii. ASCII codes for the non-printable characters (i.e. control characters) are also acceptable.

Modes and Determinism

Exceptions

(4) instantiation fault
Stream is not instantiated.
(5) type error
Stream is neither an integer nor an atom.
(5) type error
Ascii is instantiated, but not to an integer.
(190) end of file reached
End of file has been reached.
(192) illegal stream mode
Stream is not an input stream.
(193) illegal stream specification
Stream is an illegal stream specification.

Examples

Success:
      [eclipse]: get(input, 0'a),get(input,97).
      > aa
      yes.
Fail:
      [eclipse]: get(input,98).
      > a
      no.
Error:
      get(Stream,98).                 (Error 4).
      get(input, '98').               (Error 5).
      get(10,A).                      (Error 192).
      get(atom,A).                    (Error 193).



See Also

get / 1, put / 1, put / 2