Question

我需要编写一个由子规则组成的规则。

知道怎么做到这一点？

isloanaccept(Name, LoanAmount, LoanTenure) 
:-  customer(Name, bank(_),customertype(_),
    citizen(malaysian),age(Age),credit(C),
    income(I),property(car|house)), 
    Age >= 18,
    C > 500, 
    I > (LoanAmount / LoanTenure) / 12.
lowerinterest(Senior) :- isseniorcitizen(Senior).

例如，我需要检查客户类型。如果客户类型为VIP，则利息较低。如果年龄超过60岁，则降低利息。

请帮忙。

感谢。

Answer 1

向isloanaccept添加额外参数可能是最简单的方法。

isloanaccept(Name, LoanAmount, LoanTenure, Interest) :-
    customer(Name, bank(_), customertype(Type), citizen(malaysian), age(Age),
             credit(C), income(I), property(car|house)), 
    Age >= 18,
    C > 500,
    I > (LoanAmount / LoanTenure) / 12,
    interest(Age, Interest).

% Interest depending on age and customertype; add parameters, or pass in a list,
% to have interest determined by other factors
interest(Age,Type,Interest) :-
    (senior_citizen(Age) ->
        Interest = 0.05
    ; Type = vip ->
        Interest = 0.07
    ;
        Interest = 0.10
    ).

PS。：请尝试以这种方式格式化Prolog代码，这样可以更容易阅读。

Answer 2

这就是我要做的事情：

% usage: isInterestOk(+CustomerType, +Interest)
isInterestOk('VIP', Interest) :-
    Interest =< 1000.
isInterestOk('normal', Interest) :-
    Interest =< 500.

Prolog组合规则

2 个答案: