Compilare: user.cpp: In function ‘void cit()’: user.cpp:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void ins(nod*, char*)’: user.cpp:32: warning: array subscript has type ‘char’ user.cpp:35: warning: array subscript has type ‘char’ user.cpp:37: warning: array subscript has type ‘char’ user.cpp: In function ‘int del(nod*, char*)’: user.cpp:46: warning: array subscript has type ‘char’ user.cpp:48: warning: array subscript has type ‘char’ user.cpp: In function ‘void afi(nod*, char*)’: user.cpp:66: warning: array subscript has type ‘char’ user.cpp:71: warning: array subscript has type ‘char’ user.cpp: In function ‘void pre(nod*, char*)’: user.cpp:76: warning: array subscript has type ‘char’ user.cpp:81: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:86: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:87: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result