[循环](%E5%BE%AA%E7%8E%AF.md) [分支 switch case](%E5%88%86%E6%94%AFswitchcase.md) [标准输入输出](%E6%A0%87%E5%87%86%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA.md) [日期](%E6%97%A5%E6%9C%9F.md)