Compilare: user.cpp: In function ‘int get_int()’: user.cpp:34:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]==0) ^ user.cpp:39:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp: In function ‘double get_double()’: user.cpp:54:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]==0) ^ user.cpp:59:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp:71:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp: In function ‘char get_char()’: user.cpp:23:32: 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:110:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sdo.in","r",stdin); ^ user.cpp:111:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sdo.out","w",stdout); ^