Compilare: user.cpp: In function ‘bool get_string(char*)’: user.cpp:44:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!letter[x] && cont<100) ^ user.cpp:53:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(letter[x]) ^ user.cpp: In function ‘int get_int()’: user.cpp:68:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!digit[x]) ^ user.cpp:71:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp: In function ‘char get_char()’: user.cpp:31:23: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(BUF,SBUF,1,in); ^