Compilare: user.cpp: In function ‘void df(int)’: user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void nivele(int)’: user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp:36: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:30: warning: unused variable ‘i’ user.cpp: In function ‘void din(int)’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp:61: warning: comparison between signed and unsigned integer expressions