int i;
string[]a;
a=new string[12]{"jaunary","februaary","march","april","may","june","july","august","september","october","november","december"};
Console.WriteLine("请输入1—12中任意一个数字。输入0或者其他数退出");
i=int.Parse(Console.ReadLine());
do
{
             
if(i>=1&&i<12)
Console.WriteLine(a[i-1]);
else
break;
 
 
i=int.Parse(Console.ReadLine());
}while(true);