Compilare: user.cpp: In function ‘int main()’: user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp:18: warning: array subscript has type ‘char’ user.cpp:18: warning: array subscript has type ‘char’ user.cpp:19: warning: array subscript has type ‘char’ user.cpp:20: warning: array subscript has type ‘char’ user.cpp:21: warning: array subscript has type ‘char’ user.cpp:17: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:27: warning: array subscript has type ‘char’ user.cpp:28: warning: array subscript has type ‘char’ user.cpp:28: warning: array subscript has type ‘char’