goe.cpp: In function `int main()': goe.cpp:56: call of overloaded `log10(long int&)' is ambiguous /usr/include/bits/mathcalls.h:113: candidates are: double log10(double) /usr/include/c++/3.2.2/cmath:352: long double std::log10(long double) /usr/include/c++/3.2.2/cmath:344: float std::log10(float)