View Compilation Error

0_0_16232013_7542.cpp
0_0_16232013_7542.cpp(4) : error C4430: 缺少类型说明符 - 假定为 int。注意:  C++ 不支持默认 int
0_0_16232013_7542.cpp(14) : error C2668: “log10”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1211): 可能是“long double log10(long double) throw()”
        VC2013\INCLUDE\math.h(1095): 或       “float log10(float) throw()”
        VC2013\INCLUDE\math.h(502): 或       “double log10(double)”
        尝试匹配参数列表“(int)”时