In the GNU Prolog Manual, I need to understand how to read a single character from an input stream. What is the standard predicate for this, including its syntax? Also, what specific error occurs, and what is its associated object, if the input stream is not open when this predicate is called?
Navigate to the GNU Prolog Manual's main page (gprolog.org/manual/gprolog.html). Locate and navigate to the 'Character input/output' section (Section 8.12). Find the documentation for the predicate used to read a single character. Identify and extract the template for this predicate. Identify and extract the error type and object for calling this predicate on a non-open stream. State the predicate, its template, and the specific error details.
The identified predicate for reading a single character is 'get_char/1'. The template for 'get_char/1' is stated as 'get_char(?char_code)'. The error occurring if the stream is not associated with an open stream is identified as 'existence_error'. The 'Object' type for this 'existence_error' is specified as 'stream'.