686740_0_0_10712.cpp 686740_0_0_10712.cpp(12) : error C2668: “log” : 对重载函数的调用不明确 VC\include\math.h(612): 可能是“long double log(long double)” VC\include\math.h(564): 或 “float log(float)” VC\include\math.h(193): 或 “double log(double)” 试图匹配参数列表“(int)”时