using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication1

{

    class Class1

    {

        private string name;

        public Class1(string name)

        {

            // 使用this关键字表明使用当前对象的属性(或方法),后面的name是形参name

            this.name = name;

        }

        public void Eat()

        {

            Console.WriteLine("名字:" + this.name);

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            // 使用类

            Class1 myname = new Class1("namejr");

            myname.Eat();

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            int age = ;

            // 关键字ref按引用传参

            Growth(ref age);

            Console.WriteLine(age);

        }

        // 该static是int类型的++，相当于值类型

        static void Growth(ref int age)

        {

            age++;

            Console.WriteLine("int又长大一岁!!!");

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            int age = ;

            // 关键字out按引用传参

            // out可以返回多个属性值，而return只能返回一个

            int prev_a, next_a;  // 用来接收上一年和下一年的年龄

            Growth(age, out prev_a, out next_a);

            Console.WriteLine("上一年的年龄:" + prev_a);

            Console.WriteLine("明年的年龄:" + next_a);

        }

        // 使用out关键字,也用来做引用传递

        static void Growth(int age, out int prevage, out int nextage)

        {

            prevage = age - ;

            nextage = age + ;

        }

    }

}