char *s=alloc(n);
This article originally appeared on Engadget at https://www.engadget.com/science/nasa-overhauls-artemis-program-delaying-moon-landing-to-2028-164255318.html?src=rss，详情可参考WPS官方版本下载
Treasures unearthed by hundreds of archaeologists during the ongoing construction of the controversial HS2 train line have been shown exclusively to the BBC.，详情可参考快连下载安装
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* 获取数字的第digit位（从右往左，0表示个位）