题目内容：

零点到五点属于什么时段
如题：
如下：
case "6","7","8","9","10","11" n="上午"
case "12","7","8","9","10","11" n="中午"
case "13","14","15","16","17" n="下午"
case "18","19","20","21","22","23" n="晚上"
case "0","1","2","3","4","5" n="?"