Compilare: user.cpp: In function 'void rez(int)': user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp:60: warning: comparison between signed and unsigned integer expressions user.cpp:62: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:93: warning: comparison between signed and unsigned integer expressions