View Compilation Error

0_0_16423770_13034.cpp
0_0_16423770_13034.cpp(15) : error C2668: “log”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1209): 可能是“long double log(long double) throw()”
        VC2013\INCLUDE\math.h(1093): 或       “float log(float) throw()”
        VC2013\INCLUDE\math.h(501): 或       “double log(double)”
        尝试匹配参数列表“(int)”时
0_0_16423770_13034.cpp(17) : error C2668: “log”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1209): 可能是“long double log(long double) throw()”
        VC2013\INCLUDE\math.h(1093): 或       “float log(float) throw()”
        VC2013\INCLUDE\math.h(501): 或       “double log(double)”
        尝试匹配参数列表“(int)”时
0_0_16423770_13034.cpp(17) : fatal error C1903: 无法从以前的错误中恢复；正在停止编译