#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
enum mouth{Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sept,Oct,Nov,Dec};
enum mouth m;
char mouth[12][20]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sept","Oct","Nov","Dec"};
for(m=(enum mouth)(Jan+1);m<=(enum mouth)(Dec+1);m=(enum mouth)(m+1))
//m的值需要用強制轉換型別符進行型別轉換，不然會出現型別匹配錯誤，雖然列舉元素代表整型值
//但是是列舉元素m是列舉型的數值，所以進行整數運算或者賦值時必須進行型別轉換為列舉元素
{
cout<<setw(4)<<m<<"月："<<mouth[m-1];
if(m%3==0)
cout<<endl;}
return 0;

}