Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:24: error: ‘l’ was not declared in this scope user.cpp:29: 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)