using System;

class HelloWorld {
    static void Main() {
        Console.WriteLine("整数：{0}", 233);
        Console.WriteLine("浮点数：{0}", 233.33);
        Console.WriteLine("字符串：{0}", "Niconi");
        Console.WriteLine("布尔值：{0}, {1}", true, false);
        Console.WriteLine("比较：{0}, {1}, {2}", 1 < 2, (2 > 3) && (3 < 4), (4 > 5) || (5 < 6));
        Console.WriteLine("空值：null", null); //空值不能被字符串格式化
        const double PI = 3.14;
        Console.WriteLine("常量：{0}", PI);
    }
}

整数：233
浮点数：233.33
字符串：Niconi
布尔值：True, False
比较：True, False, True
空值：null
常量：3.14

using System;
using System.Text;

class HelloWorld {
    static void Main() {
        var str = "测试";
        byte[] str_bytes = Encoding.UTF8.GetBytes(str);
        // 转回String
        var str2 = Encoding.UTF8.GetString(str_bytes);
        Console.WriteLine(str2);
    }
}