WriteLine(ls.ToString())；Console.WriteLine(ls);输出结果相同，为什么要加.ToString()

 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5  6 namespace Test05 7 { 8     class PRogram 9     {10         static void Main(string[] args)11         {12             int shj1 = 45;                                    //声明整型变量shj1，并赋值为4513             int shj2 = 5;                                        //声明整型变量shj2，并赋值为514             int ls;                                            //声明整型变量ls15             ls = shj1 / shj2;                                    //使ls的值为shj1除以shj2得到的值16             Console.WriteLine(ls.ToString());17            // Console.WriteLine(ls);18             Console.Read();19 20         }21     }22 }