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View Compilation Error

0_0_2959605_31768.cpp
0_0_2959605_31768.cpp(18) : error C2668: “acos” : 对重载函数的调用不明确
        VC\include\math.h(586): 可能是“long double acos(long double)”
        VC\include\math.h(538): 或       “float acos(float)”
        VC\include\math.h(183): 或       “double acos(double)”
        试图匹配参数列表“(int)”时


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