undefined reference to 'floor'/undefined reference to

undefined reference to 'floor'/undefined reference to `&

undefined reference to 'pow'/undefined reference to `&

今天用linux编译一个程序的时候遇到了一个小问题，如标题所示，先说解决方法

在gcc 编译的时候加上-lm选项就好了，呵呵

原因：floor/ceil/pow是数学库里提供的函数，默认gcc不会自动链接math库，要手动提供

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undefined reference to 'floor'/undefined reference to

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