C#のSwitch文の使い方

以下に、Switch文の使い方といくつかのコード例を紹介します。

1. 基本的なSwitch文の例:

int number = 3;
switch (number)
{
    case 1:
        Console.WriteLine("Number is 1");
        break;
    case 2:
        Console.WriteLine("Number is 2");
        break;
    case 3:
        Console.WriteLine("Number is 3");
        break;
    default:
        Console.WriteLine("Number is not 1, 2, or 3");
        break;
}

2. 文字列を評価するSwitch文の例:

string fruit = "apple";
switch (fruit)
{
    case "apple":
        Console.WriteLine("It's an apple");
        break;
    case "banana":
        Console.WriteLine("It's a banana");
        break;
    case "orange":
        Console.WriteLine("It's an orange");
        break;
    default:
        Console.WriteLine("It's a fruit");
        break;
}

3. 列挙型を評価するSwitch文の例:

enum DayOfWeek
{
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
}
DayOfWeek day = DayOfWeek.Saturday;
switch (day)
{
    case DayOfWeek.Monday:
        Console.WriteLine("It's Monday");
        break;
    case DayOfWeek.Tuesday:
        Console.WriteLine("It's Tuesday");
        break;
    case DayOfWeek.Wednesday:
        Console.WriteLine("It's Wednesday");
        break;
    case DayOfWeek.Thursday:
        Console.WriteLine("It's Thursday");
        break;
    case DayOfWeek.Friday:
        Console.WriteLine("It's Friday");
        break;
    case DayOfWeek.Saturday:
        Console.WriteLine("It's Saturday");
        break;
    case DayOfWeek.Sunday:
        Console.WriteLine("It's Sunday");
        break;
}

これらの例では、Switch文を使用して条件に基づいて異なるコードブロックを実行する方法を示しています。必要に応じて、追加のケースや条件を追加することもできます。