【错误笔记】undefined reference to `sqrt' collect2: ld returned 1 exit status
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今天在使用 sqrt() 函数做运算时，竟然遇到了编译错误，还是用的少啊，导致很多的知识漏洞，周末给自己做点大补汤给自己补补，希望以后在遇到这种情况时，不要在依赖搜索引擎。
测试程序代码如下：
编译错误如下：
undefined reference to `sqrt'
collect2: ld returned 1 exit status
解决方案：
gcc 加上 -lm
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