Compilare: user.cpp:44:2: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:12: warning: format '%lu' expects type 'long unsigned int*', but argument 3 has type 'int*' user.cpp:5: warning: 'b2' may be used uninitialized in this function user.cpp:5: warning: 'b1' may be used uninitialized in this function user.cpp:5: warning: 'a2' may be used uninitialized in this function user.cpp:5: warning: 'a1' may be used uninitialized in this function