Compilare: user.cpp: In member function ‘char* Number::getNr()’: user.cpp:42:11: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] sir[1] = NULL; ^ user.cpp:47:13: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] sir[size] = NULL; ^ user.cpp: In member function ‘Number Number::operator+(int)’: user.cpp:53:10: warning: unused variable ‘add’ [-Wunused-variable] int i, add = 0; ^ user.cpp: In member function ‘Number Number::operator-(Number)’: user.cpp:98:7: warning: unused variable ‘i’ [-Wunused-variable] int i, scade = 0, aux; ^ user.cpp: In function ‘int main()’: user.cpp:184:6: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.cpp:184:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^