Declaring variables in loops.

Question

I am wondering about how the compiler deals with variables that are declared within the loop they appear in. Obviously if you have a:
while (loop == true);  {
int var;
// do something that involeves var...The suggestion is that it allocates an int with every loop iteration?
If I declare my variables outside of the context in which I use them, then they persist throughout code that doesn't need them.
Surely the compiler is smarter than that?

Answer 1

If I declare my variables outside of the contextin
which I use them, then they persist throughoutcode
that doesn't need them.The same goes for the variables declared in a loop.No it doesn't.
If I write this:
public class test
     public static void main(String[] args)
          for (int x = 0; x < 255; x++) {
               int y = 12;
               System.out.print(x + ", ");
          System.out.println("\n" + y + x);
}The compiler throws two errors because the lower println statement has never heard of either x or y.
Just declare the variables in the scope block closest
to where they are needed. You're worrying about
things that need not concern you.Oh, it does concern me though. I want my programs to be as neat as clean as possible and I also want to learn to be the best programmer I can: I'm not here to just leap on a gravy train! : )
See, I do want to format my files in the manner you suggest, with variable declared in the scope in which they used, but how do I make adjustments to them later: I want to do this from the top of my file.
If anybody has the answer I'll give them four more Duke dollars! : )