Compilare: user.cpp: In function ‘void read()’: user.cpp:11: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void do_smen()’: user.cpp:25: warning: ‘last’ may be used uninitialized in this function user.cpp:25: warning: ‘lc’ may be used uninitialized in this function