This built-in clause reads a single character from the current input stream, the stream is altered. The current input stream must be a text stream that was opened for reading. An in_character is a character or the atom 'end_of_file'.
see also: get_char/2 get_code/1 get_code/2 peek_char/1 peek_char/2 peek_code/1 peek_code/2 prolog I/O put_char/1 put_char/2 put_code/1 put_code/2 nl/0 nl/1
| Example | |
| get_char(A). | Assume the current input stream has contents: q, w, r, ... A is assigned the value q and the stream is left as: w, r, ... |
| get_char('a'). | Assume the current input stream has contents: q, w, r, ... get_char/1 fails, and a character was removed from the stream, the current input stream is left as: w, r, ... |
| Exceptions | |
| Char is neither a variable nor an in_character | a type_error(in_character, Char) is thrown |
| current input stream is a binary stream | a permission_error(input, binary_stream, InputStream) is thrown, the variable InputStream is assigned the stream which was used as the input stream |
| current input stream has properties end_of_stream(past) and eof_action(error) | a permission_error(input, past_end_of_stream, InputStream) exception is thrown |