760111_0_0_23061.cpp
760111_0_0_23061.cpp(4) : 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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