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0_0_9244486_29334.cpp
0_0_9244486_29334.cpp(10) : error C2668: “atan2” : 对重载函数的调用不明确
        VC\include\math.h(592): 可能是“long double atan2(long double,long double)”
        VC\include\math.h(544): 或       “float atan2(float,float)”
        VC\include\math.h(186): 或       “double atan2(double,double)”
        试图匹配参数列表“(int, int)”时