Character Codes

Many of the examples in this manual show lists of character codes being written as quoted strings. This actually happens if you load the library package library(printchars). That package extends the predicate portray/1 (using library(addportray)) so that print/1, the top-level, and the debugger will write lists of character codes as follows:

     | ?- X = [0'a,0'b,0'c].
     X = [97,98,99]
     | ?- ensure_loaded(library(printchars)).
     | ?- X = [0'a,0'b,0'c].
     X = "abc"