Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:15: error: call of overloaded ‘abs(long int)’ is ambiguous /usr/include/stdlib.h:766: note: candidates are: int abs(int) /usr/include/c++/4.4/cmath:102: note: long double std::abs(long double) /usr/include/c++/4.4/cmath:98: note: float std::abs(float) /usr/include/c++/4.4/cmath:94: note: double std::abs(double)