Eroare de compilare: user.cpp:12: warning: integer constant is too large for ‘long’ type user.cpp: In function ‘int main()’: user.cpp:24: error: call of overloaded ‘abs(int&)’ is ambiguous /usr/include/c++/4.4/cmath:94: note: candidates are: double std::abs(double) /usr/include/c++/4.4/cmath:98: note: float std::abs(float) /usr/include/c++/4.4/cmath:102: note: long double std::abs(long double) user.cpp:11: warning: unused variable ‘b’