How do we clear the cache? Fflush Clear Ignore

1) fflush

The compiler stipulates that Fflush is used to flush the output stream, and there is no provision for the input stream, that is, the fflush (stdin) result is unknown.

This is the VC under the C program, Fflush (stdin) effective, VC write C + + program, fflush (stdin) Invalid reason.

2) when writing C + + programs under VC, empty the cache using clear and ignore

1 // Resets the state of the input stream (recovered from the error) 2 std::cin.clear (); 3 4 // empties the input stream until the specified character (EOF by default) 5 Std::cin.ignore (Int_max); 6 // Std::cin.ignore (Int_max, ' \ n ');

How do we clear the cache? Fflush Clear Ignore