Compilare: user.cpp: In function ‘long long int get_int()’: user.cpp:40:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(is_char[x]==0) ^ user.cpp:49:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(is_char[x]) ^ user.cpp: In function ‘char get_char()’: user.cpp:25:32: 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,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:147:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tcast.in","r",stdin); ^ user.cpp:148:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tcast.out","w",stdout); ^