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0_0_37346451_24508.cpp
0_0_37346451_24508.cpp(6) : error C2668: “acos”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1147): 可能是“long double acos(long double) throw()”
        VC2013\INCLUDE\math.h(1031): 或       “float acos(float) throw()”
        VC2013\INCLUDE\math.h(474): 或       “double acos(double)”
        尝试匹配参数列表“(int)”时
0_0_37346451_24508.cpp(12) : error C2668: “pow”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1233): 可能是“long double pow(long double,int) throw()”
        VC2013\INCLUDE\math.h(1231): 或       “long double pow(long double,long double) throw()”
        VC2013\INCLUDE\math.h(1117): 或       “float pow(float,int) throw()”
        VC2013\INCLUDE\math.h(1115): 或       “float pow(float,float) throw()”
        VC2013\INCLUDE\math.h(1027): 或       “double pow(double,int) throw()”
        VC2013\INCLUDE\math.h(512): 或       “double pow(double,double)”
        尝试匹配参数列表“(int, int)”时