reads from a stream a single character and returns its character code.
get_code/1 reads a single character from the current input stream.
get_code/2 reads a single character from the stream named in the first argument.
get_code reads the character at the current stream position and unifies its character code with Code. If the stream position is behind the end of stream, Code will be unified with -1.
Stream text input stream Code integer (unicode or -1)
Assume the content of a stream S is abcdefg and the stream position is at the 1st character.
| get_char(S, 0'a). | Succeeds. The stream position will be advanced by one character. |
| get_char(0'd). | Fails. The stream position will be advanced by one character. |
These predicates are part of the ISO-Prolog Standard.
get_char/1/2, peek_char/1/2, peek_code/1/2, put_char/1/2, put_code/1/2, nl/0/1, set_input/1, current_input/1.
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