Compilare: user.cpp: In constructor ‘HN::HN(int)’: user.cpp:22:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] x[++x[0]]++; ^ user.cpp: In member function ‘HN HN::operator/(long long int)’: user.cpp:36:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(x[0]>1 && !x[x[0]]) ^ user.cpp:47:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(carry==1)x[++x[0]]=1; ^ user.cpp: In member function ‘HN HN::operator*(long long int)’: user.cpp:61:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] x[++x[0]]=r%10; ^ user.cpp: In member function ‘void HN::scan()’: user.cpp:74:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] x[++x[0]]=c; ^ user.cpp: In function ‘int main()’: user.cpp:94:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.in", "r", stdin); ^ user.cpp:95:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.out", "w", stdout); ^ user.cpp:99:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &d); ^ user.cpp: In member function ‘void HN::scan()’: user.cpp:70:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &c); ^ user.cpp:75:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &c); ^