Eroare de compilare: user.cpp: In member function 'bool complex::operator<(complex)': user.cpp:25: error: call of overloaded 'abs(double)' is ambiguous /usr/include/stdlib.h:691: note: candidates are: int abs(int) /usr/include/c++/4.2/cstdlib:174: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.2/cstdlib:143: note: long int std::abs(long int) user.cpp: In member function 'bool complex::operator>(complex)': user.cpp:30: error: call of overloaded 'abs(double)' is ambiguous /usr/include/stdlib.h:691: note: candidates are: int abs(int) /usr/include/c++/4.2/cstdlib:174: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.2/cstdlib:143: note: long int std::abs(long int) user.cpp: In member function 'bool complex::operator==(complex)': user.cpp:34: error: call of overloaded 'abs(double)' is ambiguous /usr/include/stdlib.h:691: note: candidates are: int abs(int) /usr/include/c++/4.2/cstdlib:174: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.2/cstdlib:143: note: long int std::abs(long int) user.cpp:34: error: call of overloaded 'abs(double)' is ambiguous /usr/include/stdlib.h:691: note: candidates are: int abs(int) /usr/include/c++/4.2/cstdlib:174: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.2/cstdlib:143: note: long int std::abs(long int)