sqrt函数找不到标识符

当使用gcc编译时，如果在代码中使用了sqrt函数但是没有加上-lm参数，编译器会报错说找不到sqrt函数的标识符。这是因为sqrt函数属于math库，需要在编译时加上-lm参数来链接math库，使得编译器能够找到sqrt函数的定义。类似地，当编写使用了posix thread的程序时，也需要在编译时加上-lpthread参数来链接pthread库。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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