how to make a default message for wrong input

[newbieg]

I don't get what's wrong Chiritso, when I ran andywestken's code in my comp it ran perfectly.
What exactly is going on (Or what do you want to happen differently) when you type in a letter or word?

[Athar]

The main problem is that sync() is unreliable, what it does (or if it does anything at all) depends on the implementation.