View Compilation Error

0_0_21130959_19427.cpp
0_0_21130959_19427.cpp(6) : error C2365: “exp”: 重定义；以前的定义是“函数”
0_0_21130959_19427.cpp(33) : error C2563: 在形参表中不匹配
0_0_21130959_19427.cpp(33) : error C2568: “<”: 无法解析函数重载
        VC2013\INCLUDE\xtgmath.h(98): 可能是“::std::enable_if<std::is_integral<_Ty>::value,double>::type exp(_Ty)”
        VC2013\INCLUDE\math.h(1175): 或       “long double exp(long double) throw()”
        VC2013\INCLUDE\math.h(1059): 或       “float exp(float) throw()”
        VC2013\INCLUDE\math.h(488): 或       “double exp(double)”
        VC2013\INCLUDE\math.h(488): 或       “double exp(double)”
        VC2013\INCLUDE\math.h(1059): 或       “float exp(float) throw()”
        VC2013\INCLUDE\math.h(1175): 或       “long double exp(long double) throw()”
        VC2013\INCLUDE\xtgmath.h(98): 或       “::std::enable_if<std::is_integral<_Ty>::value,double>::type exp(_Ty)”
0_0_21130959_19427.cpp(38) : error C2563: 在形参表中不匹配
0_0_21130959_19427.cpp(38) : error C2568: “<”: 无法解析函数重载
        VC2013\INCLUDE\xtgmath.h(98): 可能是“::std::enable_if<std::is_integral<_Ty>::value,double>::type exp(_Ty)”
        VC2013\INCLUDE\math.h(1175): 或       “long double exp(long double) throw()”
        VC2013\INCLUDE\math.h(1059): 或       “float exp(float) throw()”
        VC2013\INCLUDE\math.h(488): 或       “double exp(double)”
        VC2013\INCLUDE\math.h(488): 或       “double exp(double)”
        VC2013\INCLUDE\math.h(1059): 或       “float exp(float) throw()”
        VC2013\INCLUDE\math.h(1175): 或       “long double exp(long double) throw()”
        VC2013\INCLUDE\xtgmath.h(98): 或       “::std::enable_if<std::is_integral<_Ty>::value,double>::type exp(_Ty)”