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ubuntu 下 数学库编译链接时找不到各种数学问题解决方法 can not fon atan 等等
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解决参考 http://askubuntu.com/questions/190246/ld-cannot-find-math-library
you should use -lm at the end.because unresolved symbols are found after gcc encounters montecarlo_time.o and there is no library or anything else in which it can find it can resolve that symbol.
把 -lm 链接发到 -o 前面 ,放到链接其他库的最后面






