[c-prog] how to ask C++ to read backward?

[hue]

Dear C++ guys, 

Is there  a way to ask C++ read backward, instead of forward, 

eg, I want to read value for intxx,
I do 
  cin>>intxx; 
  if intxx if not the value I want, how can I ask C++ to spit this
value out, so when I do 
  cin>>intyy;      then, I can give this value to intyy.
  and I don't want to let intyy = intxx; 

Thanks you guys 


Hue