Compilare: user.cpp: In function ‘int main()’: user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp:35: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:39: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:13: warning: unused variable ‘j’ user.cpp:15: warning: ‘ultimadeschisa’ may be used uninitialized in this function