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prolog - 如何在 GNU-Prolog 中运行这样的程序？

问题描述

每次我尝试编译它时，编译似乎总是失败。我对该语言非常陌生，并且在寻找使用 Prolog 的程序示例时发现了这个程序，但我不知道如何运行它。使用这个程序片段作为示例的原因是，我想制作一个自己的程序，能够根据用户输入的症状让用户知道他们得了什么病。

domains
disease,indication = symbol.
Patient,name = string.
predicates
hypothesis(string,disease).
symptom(name,indication).
response(char).
go.
clauses

该程序会在第一行检测到错误，我不知道为什么。

go :-
    write("What is the patient's name? "),
    readln(Patient),
    hypothesis(Patient,Disease),
    write(Patient,"probably has ",Disease,"."),nl.

go :-
    write("Sorry, I don't seem to be able to"),nl,
    write("diagnose the disease."),nl.

symptom(Patient,fever) :-
    write("Does ",Patient," have a fever (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,rash) :-
    write("Does ",Patient," have a rash (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,headache) :-
    write("Does ",Patient," have a headache (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,runny_nose) :-
    write("Does ",Patient," have a runny_nose (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,conjunctivitis) :-
    write("Does ",Patient," have a conjunctivitis (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,cough) :-
    write("Does ",Patient," have a cough (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,body_ache) :-
    write("Does ",Patient," have a body_ache (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,chills) :-
    write("Does ",Patient," have a chills (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,sore_throat) :-
    write("Does ",Patient," have a sore_throat (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,sneezing) :-
    write("Does ",Patient," have a sneezing (y/n) ?"),
    response(Reply),
    Reply='y'.

symptom(Patient,swollen_glands) :-
    write("Does ",Patient," have a swollen_glands (y/n) ?"),
    response(Reply),
    Reply='y'.

hypothesis(Patient,measles) :-
    symptom(Patient,fever),
    symptom(Patient,cough),
    symptom(Patient,conjunctivitis),
    symptom(Patient,runny_nose),
    symptom(Patient,rash).

hypothesis(Patient,german_measles) :-
    symptom(Patient,fever),
    symptom(Patient,headache),
    symptom(Patient,runny_nose),
    symptom(Patient,rash).

hypothesis(Patient,flu) :-
    symptom(Patient,fever),
    symptom(Patient,headache),
    symptom(Patient,body_ache),
    symptom(Patient,conjunctivitis),
    symptom(Patient,chills),
    symptom(Patient,sore_throat),
    symptom(Patient,runny_nose),
    symptom(Patient,cough).    

hypothesis(Patient,common_cold) :-
    symptom(Patient,headache),
    symptom(Patient,sneezing),
    symptom(Patient,sore_throat),
    symptom(Patient,runny_nose),
    symptom(Patient,chills).

hypothesis(Patient,mumps) :-
    symptom(Patient,fever),
    symptom(Patient,swollen_glands).

hypothesis(Patient,chicken_pox) :-
    symptom(Patient,fever),
    symptom(Patient,chills),
    symptom(Patient,body_ache),
    symptom(Patient,rash).

hypothesis(Patient,measles) :-
    symptom(Patient,cough),
    symptom(Patient,sneezing),
    symptom(Patient,runny_nose).

response(Reply) :-
    readchar(Reply),
    write(Reply),nl.

标签： prolog

解决方案

您的代码似乎是 TurboProlog 或 Visual Prolog 代码。domains首先删除以.开头的代码clauses。您还需要将调用readchar/1和readln/1谓词替换为对标准 Prolog 谓词（例如read/1or ）的调用read_term/3。在特定情况下readchar/1，并且仅用于在 GNU Prolog 下运行，您可以将其定义为：

    readchar(Char) :-
        get_key(Code), char_code(Char, Code), nl.

其他一些 Prolog 系统提供了readchar功能，但没有标准。与标准谓词相比，这些谓词的主要区别在于get_char/1在顶层使用时不需要返回/输入。

此外，用write对标准谓词的一系列调用替换所有大于 1 的调用，write/1并用单引号替换这些调用中的双引号。

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