回答編集履歴
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インターフェイスをジェネリクスにして IQuestion<T> にする
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~~インターフェイスをジェネリクスにして IQuestion<T> にする~~
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回答が全てintではなかったですね。すみません。
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```csharp
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public class CalcQuestion : IQuestion<int, int>
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{
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private readonly int First;
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private readonly int Second;
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public CalcQuestion(int x, int y)
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{
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First = x;
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Second = y;
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}
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public string Inquire() => $"{First} x {Second} = ?";
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public bool IsCorrect(int answer) => answer == First * Second;
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public int GetCorrectAnswer() => First * Second;
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}
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public class CombinationQuestion : IQuestion<(int, int), IEnumerable<(int, int)>>
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{
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private readonly int Prod;
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private readonly IEnumerable<(int, int)> Pairs;
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public CombinationQuestion(int x)
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{
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Prod = x;
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Pairs = Enumerable.Range(1, x).Select(i => x % i == 0 ? (i, x / i) : (0, 0)).Where(t => t.Item1 != 0);
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}
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public string Inquire() => $"? x ? = {Prod}";
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public bool IsCorrect((int, int) answer) => Pairs.Contains(answer);
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public IEnumerable<(int, int)> GetCorrectAnswer() => Pairs;
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}
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public interface IQuestion<in T, out U>
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{
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string Inquire();
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bool IsCorrect(T answer);
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U GetCorrectAnswer();
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}
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```
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