Compilare: user.cpp: In function ‘void impartire(char*, int)’: user.cpp:24: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:33: warning: array subscript has type ‘char’ user.cpp:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result