Compilare: user.cpp: In function ‘int get_int()’: user.cpp:39:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!cif[x]) ^ user.cpp:54:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(cif[x]) ^ user.cpp: In function ‘int comp(int)’: user.cpp:171:9: warning: unused variable ‘r’ [-Wunused-variable] int r=(x+1)/2*4-1-x; ^ user.cpp:172:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘char get_char()’: user.cpp:25:29: 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); ^