Compilare: user.cpp: In function ‘long long int get_int()’: user.cpp:83:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!digit[x]) ^ user.cpp:94:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(digit[x]) ^ user.cpp: In function ‘char get_char()’: user.cpp:70:29: 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); ^ user.cpp: In function ‘int main()’: user.cpp:118:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&l,&c,&m); ^