问题
So i made a list using atom_chars(X,Y). Which split the string 'abc' into [a,b,c]. I now want to assign numbers to the elements in the list. Such as a is 4, b is 2, c is 7.
How would i go about doing this?
回答1:
In Prolog, the symbols a, b, and c are considered atoms. You can't "assign" values to them. You could, however, associate numbers with them using, for example, - as a convenient notation for a term. You could form a list:
[a-2, b-4, c-3]
Let's say you bind this to the variable AssocList. Then if you have a letter or character bound to C, you can query:
member(C-N, AssocList)
This will bind N to the number associated with C. Likewise, if you have a number, it will yield all of the characters C that are associated with that number.
来源：https://stackoverflow.com/questions/59120632/how-to-give-values-to-items-in-a-list-in-prolog