在 c# 上需要帮助

Question

I have recently started to learn c# and Im trying to make something like trivia, i have created 3 closed questions(with answers 0-3), and now Im trying to create an open question but i don't know how to make it open, how to make the user enter an answer and how to check if its true or false. any help will be greatfull!

this is my code:

using FirstProject;
using System;
using System.Collections.Generic;

namespace FirstProject{
    class Program{
        static void Main(string[] args){
            String[] q1a = { "Blue", "Black", "Red", "Green" };
            QuestionA q1 = new QuestionA("What is the color of a tomato?",q1a,2);

            String[] q2a = { "10", "25", "125", "2.5" };
            QuestionA q2 = new QuestionA("how much is 5X5", q2a, 1);

            String[] q3a = { "2", "5", "4", "10" };
            QuestionA q3 = new QuestionA("how many eyes do i have?", q3a, 0);

            List<QuestionA> QL = new List<QuestionA>() { q1, q2, q3, q4 };
            int CorrectA = 0;
            int TotalQ = QL.Count;
            Random Rnd = new Random();
            while (QL.Count > 0)
            {
                int RM = Rnd.Next(0, QL.Count);
                Boolean Answer = QL[RM].PrintQuestion();
                if (Answer) CorrectA++;
                QL.RemoveAt(RM);

            }
            //Console.WriteLine(TotalQ);
            Double GrD = ((Double)CorrectA / (Double)TotalQ) * 100;
            if (GrD < 56)
                Console.WriteLine("You Have failed, Your Grade is:" + GrD);
            else 
                Console.WriteLine("Congrats u Passed the test with a grade of:" + GrD);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace FirstProject
{
    class QuestionA
    {
        public String question;
        public String[] answers;
        public int correct;
        public QuestionA(String question, String[] answers, int correct)
        {
            this.question = question;
            this.answers = answers;
            this.correct = correct;
        }
        public Boolean PrintQuestion()
        {
            Console.WriteLine("Plz type the right answer(0-3)");
            Console.WriteLine("Q:" + this.question);
            for (int i = 0; i < 4; i++)
            {
                Console.WriteLine(i + ":" + this.answers[i]);
            }
            return this.CheckAnswer();
        }
        public Boolean CheckAnswer()
        {
            int answer = Convert.ToInt32(Console.ReadLine());
            if (this.correct == answer)
            {
                return true;
            }
            return false;
        }

    }
}

Thx a lot with any help!

Answer 1

A simple first approach would be to declare keywords expected in the answer and to check if the user answer contains any/some/all of the expected keywords.

The new type of question would have to created like this:

String[] q4a = { "black" };
QuestionOpen q4 = new QuestionOpen("what is the color of the sky's at night?", q4a);

with the QuestionOpen like this:

class QuestionOpen
{
    public String question;
    public String[] correctKeyWords;
    public QuestionOpen(String question, String[] correctKeyWords)
    {
        this.question = question;
        this.correctKeyWords = correctKeyWords;
    }
    public Boolean PrintQuestion()
    {
        Console.WriteLine("Plz type your answer");
        Console.WriteLine("Q:" + this.question);
        return this.CheckAnswer();
    }
    public Boolean CheckAnswer()
    {
        string answer = Console.ReadLine();
        bool isAnswerCorrect = false;
        foreach( string keyWord in this.correctKeyWords)
        {
            if (answer.Contains(keyWord))
            {
                isAnswerCorrect = true;
                //You could have a counter and check if a percentage of the keyword are in the answer
            }
            else
            {
                //Nothing do do
            }
        }
        return isAnswerCorrect;
    }
}

A good way to check the keywords instead of the "contains" used here would be a fuzzy search but it isn't the best way to start c# imo as it might not be easy/fun to do.

Let me know if you have any question regarding this (I tried not to change to much code as to not make it confusing).

Ps: A nice way to integrate the new type of question into your list would be to declare an interface. https://docs.microsoft.com/en-gb/dotnet/csharp/language-reference/keywords/interface (It's basically a way to declare the methods/property that the object implementing the interface must have).

usage:

List<IQuestion> QL = new List<IQuestion>() { q1, q2, q3, q4};
        int CorrectA = 0;
        int TotalQ = QL.Count;
        Random Rnd = new Random();
        while (QL.Count > 0)
        {
            int RM = Rnd.Next(0, QL.Count);
            Boolean Answer = QL[RM].PrintQuestion();
            if (Answer) CorrectA++;
            QL.RemoveAt(RM);
        }