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Succeeds if the ascii code of the next character read in raw mode from the current input is successfully unified with Ascii.
Variable or integer.


Takes the next character from the current input and unifies its integer ASCII code (in the range 0 to 255) with Ascii. The input is in raw mode so that no newline character must be typed.

ASCII codes for the non-printable characters (i.e. control characters) are also acceptable.

Modes and Determinism


(5) type error
Ascii is instantiated, but not to an integer.
(190) end of file reached
End of file was encountered before reading any character.
(198) reading past the file end
Trying to read even after the error 190 was raised.


   Equivalent to tyi(input, Ascii).  (see tyi/2 for details).

See Also

tyi / 2, tyo / 1, tyo / 2