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

namespace p415zlxhyylx
{
    class  Test{
         public int a;
     }
    class Program
    {            
            static void Main(string[] args)
        {
            int x = 42, y = x;
            Test t1 = new Test();
            t1.a = 42;
            Test t2 = t1;
            Console.WriteLine("x=" + x + " y=" + y + "\rt1.a=" + t1.a + " t2.a=" + t2.a);//为什么用了\r后只显示t1.a和t2.a的值
            Console.ReadLine();
        }
    }
}

\r的意思是回车,就是回到行首
然后接着输出把前面的覆盖了
所以你除了回车以外,还要加换行符\n
Console.WriteLine("x=" + x + " y=" + y + "\r\nt1.a=" + t1.a + " t2.a=" + t2.a);

二楼正解

正解  一般不单独用\r