Compilare: user.cpp: In function 'int main()': user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp:52: warning: suggest parentheses around assignment used as truth value user.cpp:65: warning: comparison between signed and unsigned integer expressions user.cpp:67: warning: suggest parentheses around assignment used as truth value user.cpp: In function 'int verificare(int)': user.cpp:90: warning: unused variable 'i' user.cpp: In function 'void back(int)': user.cpp:108: warning: comparison between signed and unsigned integer expressions user.cpp:122: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void sort(char*)': user.cpp:144: warning: right-hand operand of comma has no effect user.cpp:145: warning: comparison between signed and unsigned integer expressions