Conditions

Is it not possible to use
if(0<x<10){}

or do you have to use
if(x>0&&x<10){}

?

What >>2 said, but it's a good idea to put them in separate brackets, for the sake of readability.
if((x > 0) && (x < 10) {
  shit;
}
It evaluates to the exact same thing, since < and > operators have higher priority than && operator, but it looks nicer.