Compilare: user.cpp: In function 'Node* add_char(Node*, char)': user.cpp:31: warning: array subscript has type 'char' user.cpp:32: warning: array subscript has type 'char' user.cpp:33: warning: array subscript has type 'char' user.cpp:36: warning: array subscript has type 'char' user.cpp: In function 'Node* add_char2(Node*, char)': user.cpp:42: warning: array subscript has type 'char' user.cpp:43: warning: array subscript has type 'char' user.cpp:44: warning: array subscript has type 'char' user.cpp: In function 'Node* advance_char(Node*, char)': user.cpp:50: warning: array subscript has type 'char' user.cpp:51: warning: array subscript has type 'char' user.cpp:52: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:100: warning: comparison between signed and unsigned integer expressions user.cpp:103: warning: comparison between signed and unsigned integer expressions user.cpp:119: warning: comparison between signed and unsigned integer expressions user.cpp:121: warning: comparison between signed and unsigned integer expressions /tmp/ccCrFrTU.o: In function `main': user.cpp:(.text+0x308): warning: the `gets' function is dangerous and should not be used.