speciale.cpp: In function `int main()': speciale.cpp:52: call of overloaded `pow(int, long int&)' is ambiguous /usr/include/bits/mathcalls.h:154: candidates are: double pow(double, double) /usr/include/c++/3.2.2/cmath:427: long double std::pow(long double, int) /usr/include/c++/3.2.2/cmath:423: float std::pow(float, int) /usr/include/c++/3.2.2/cmath:419: double std::pow(double, int) /usr/include/c++/3.2.2/cmath:410: long double std::pow(long double, long double) /usr/include/c++/3.2.2/cmath:401: float std::pow(float, float) speciale.cpp:9: warning: unused variable `long int ok'