CSharp-Learning/lessons/Lesson04/Program.cs

using System;

namespace Lesson04
{
    class Program
    {
        static void Main(string[] args)
        {
            // ========== 方法调用 ==========
            Console.WriteLine("=== 方法 ===");
            SayHello("无言势");
            int sum = Add(10, 20);
            Console.WriteLine($"10 + 20 = {sum}");

            // 带默认参数
            Greet();
            Greet("VRC");

            // ========== 类和对象 ==========
            Console.WriteLine("\n=== 类和对象 ===");
            Person p1 = new Person("无言势", 25);
            Person p2 = new Person("玩家A", 30);

            p1.SayHi();
            p2.SayHi();

            // ========== 静态方法 ==========
            Console.WriteLine("\n=== 静态方法 ===");
            int result = MathHelper.Add(100, 200);
            Console.WriteLine($"100 + 200 = {result}");

            double pi = MathHelper.GetPI();
            Console.WriteLine($"PI ≈ {pi}");

            // ========== 面向对象练习 ==========
            Console.WriteLine("\n=== 麦克风类 ===");
            Microphone mic = new Microphone("USB麦克风", true);
            mic.ToggleListening();
            mic.ToggleListening();

            Console.ReadLine();
        }

        // ========== 方法定义 ==========
        static void SayHello(string name)
        {
            Console.WriteLine($"你好, {name}!");
        }

        static int Add(int a, int b)
        {
            return a + b;
        }

        static void Greet(string name = "World")
        {
            Console.WriteLine($"Hello, {name}");
        }
    }

    // ========== 类定义 ==========
    class Person
    {
        public string name;
        public int age;

        // 构造函数
        public Person(string name, int age)
        {
            this.name = name;
            this.age = age;
        }

        public void SayHi()
        {
            Console.WriteLine($"我是{name}，今年{age}岁");
        }
    }

    // 静态类
    static class MathHelper
    {
        public static int Add(int a, int b)
        {
            return a + b;
        }

        public static double GetPI()
        {
            return 3.14159;
        }
    }

    // 麦克风类 - 结合项目练习
    class Microphone
    {
        private string name;
        private bool isListening;

        public Microphone(string name, bool isListening)
        {
            this.name = name;
            this.isListening = isListening;
        }

        public void ToggleListening()
        {
            isListening = !isListening;
            if (isListening)
            {
                Console.WriteLine($"[{name}] 开始监听...");
            }
            else
            {
                Console.WriteLine($"[{name}] 停止监听");
            }
        }
    }
}