ref、out

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ref_out
{
    class Program
    {
        static void Method1(ref int i)
        {
            i = 44;
        }

        static void Method2(out int j)
        {
            j = 55;//out 內部必須要有值
        }

        static void Method3(ref int h)
        {
            //ref 內部可以為空，為空時得到的值是初始化值；不為空時得到的是ref傳出的值
        }

        static void Method4(ref int h)
        {
            h += 11;
        }

        static void Main()
        {
            int val1 = 0;
            int val2;
            int val3 = 66;
            int val4 = 66;
        
            Method1(ref val1);//使用ref時 要先初始化。傳入傳出
            Method2(out val2);//可以不初始化，傳出值
            Method3(ref val3);
            Method4(ref val4);
        
            Console.WriteLine(val1);//44
            Console.WriteLine(val2);//55
            Console.WriteLine(val3);//66
            Console.WriteLine(val4);//77
            Console.ReadKey();
        }

    }
}