[格式](%E6%A0%BC%E5%BC%8F.md) [输出到控制台](%E8%BE%93%E5%87%BA%E5%88%B0%E6%8E%A7%E5%88%B6%E5%8F%B0.md) [输出到文件](%E8%BE%93%E5%87%BA%E5%88%B0%E6%96%87%E4%BB%B6.md) [两个都输出](%E4%B8%A4%E4%B8%AA%E9%83%BD%E8%BE%93%E5%87%BA.md)