教授要球写个数独得程序,这个function编不出来。这是RME，求大家帮个忙
// REQUIRES:  nothing
// MODIFIES:  the input stream
// EFFECTS:
// clears any fail/error state and throws away input remaining on the line
//  This MUST be done for every error state
//  and done at the point where you know of the error
//  If you are printing an error message, you need to consider if you
//  need to call this function.  
//  Most times -- print error message AND call clearInput()
void clearInput();