Compilare: user.cpp: In function ‘void read()’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:29: warning: unused variable ‘sep’ user.cpp:30: warning: unused variable ‘lim’ user.cpp:31: warning: unused variable ‘p’ user.cpp:32: warning: unused variable ‘vals’ user.cpp:33: warning: unused variable ‘ops’ user.cpp: In function ‘int eval(int)’: user.cpp:115: warning: control reaches end of non-void function