Compilare: user.cpp: In function 'int main()': user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp:17: warning: suggest parentheses around assignment used as truth value user.cpp:18: warning: suggest parentheses around assignment used as truth value user.cpp:5: warning: 'z' is used uninitialized in this function user.cpp:9: warning: 's' may be used uninitialized in this function user.cpp:9: warning: 'j' may be used uninitialized in this function