Compilare: user.cpp: In function ‘int main()’: user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp:42: warning: array subscript has type ‘char’ user.cpp:43: warning: array subscript has type ‘char’ user.cpp:48: warning: array subscript has type ‘char’ user.cpp:49: warning: array subscript has type ‘char’ user.cpp:50: warning: array subscript has type ‘char’ user.cpp:60: warning: array subscript has type ‘char’