Compilare: user.cpp: In function 'void ordo()': user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:49: warning: comparison between signed and unsigned integer expressions user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp:45: warning: unused variable 'j' user.cpp:46: warning: 'co2' may be used uninitialized in this function