406640_0_0_3035.cpp 406640_0_0_3035.cpp(16) : error C2668: “sqrt” : 对重载函数的调用不明确 VC\include\math.h(626): 可能是“long double sqrt(long double)” VC\include\math.h(578): 或 “float sqrt(float)” VC\include\math.h(200): 或 “double sqrt(double)” 试图匹配参数列表“(int)”时