Compilare: user.cpp: In function ‘int get_int()’: user.cpp:122:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]==0) ^ user.cpp:127:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp: In function ‘double get_double()’: user.cpp:142:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]==0) ^ user.cpp:147:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp:159:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp: In function ‘char get_char()’: user.cpp:111:32: 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:195:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in","r",stdin); ^ user.cpp:196:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out","w",stdout); ^