Compilare: user.cpp: In function ‘void insert(char*)’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:32: warning: array subscript has type ‘char’ user.cpp:34: warning: array subscript has type ‘char’ user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp:40: warning: array subscript has type ‘char’ user.cpp:42: warning: array subscript has type ‘char’ user.cpp:43: warning: array subscript has type ‘char’ user.cpp: In function ‘void del(char*)’: user.cpp:51: warning: array subscript has type ‘char’ user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:61: warning: array subscript has type ‘char’ user.cpp:66: warning: comparison between signed and unsigned integer expressions user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp:75: warning: array subscript has type ‘char’ user.cpp: In function ‘int apar(char*)’: user.cpp:87: warning: comparison between signed and unsigned integer expressions user.cpp:90: warning: array subscript has type ‘char’ user.cpp: In function ‘int pref(char*)’: user.cpp:104: warning: comparison between signed and unsigned integer expressions user.cpp:107: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:123: warning: format ‘%s’ expects type ‘char*’, but argument 4 has type ‘char (*)[23]’