switch(month) {
case 3:
case 4:
case 5:
cout << "春季" << endl;
break;
case 6:
case 7:
case 8:
cout << "夏季" << endl;
break;
case 9:
case 10:
case 11:
cout << "秋季" << endl;
break;
case 12:
case 1:
case 2:
cout << "冬季" << endl;
break;
default:
cout << "无效的月份" << endl;
}