Statement error in for loop noobq

Question

Hi
Could anyoe tell me why this wont work? Its supposed to count upp to tal in the first one and then count down from tal in the second and its the second one that dont work. I get a statement error for the text i put in between stars (supposed to be bold but i dont know..)
thanks
class r?knaa {
    public static void main(String[] args) {
        new r?knaa().run();
    void run() {
     int tal = Keyboard.nextInt ("Ange ett tal ? s? ska vi r?kna...(^_^): ");
     for (int upp = 1; upp <= tal; upp = upp + 1) {
         System.out.print ( upp+ " " );
     System.out.println (" ");
     System.out.println (" ");
     for (*tal*; tal > 0; tal = tal -1 ){
         System.out.print ( tal+ " " );
}Edited by: gibitlib on Feb 19, 2010 3:02 PM

Answer 1

jverd wrote:
sharkura wrote:
I assumed that it would decrement after the block of statements associated with the while loop, as is true with the for loop.Not sure what you mean by "as is true with the for loop", but I'm catching a hint of a very common misconception about the post-inc/dec operators.
A LOT of people think that post-inc/dec means "last step in the statement" or "after everything else has been done" or something like that. That kind of thiiking is just black magic hocus pocus and serves no purposeI don't think I thiik like that, Jeff. I've never used a post-inc operator in a while loop. Certainly, if I felt a need to do so, I would test it, and try to understand why it works the way it does. Empirically, I know that given the following for loop:
for ( int i = 0; i < limit; i++ )
  ... some statements
}the incrementation of i occurs after the statements in the block execute. It may be specific to the for loop that the third statement in the for loop executes after the block of statements, in which case
for ( int i = 0; i < limit; ++i )
  ... some statements
}would work the same, and you can bet I will test that.
I did make an assumption last night, and did not test it. That is not typical of me. I do resent somewhat the accusation of black magic hocus pocus. My last statement in that post was:
sharkura wrote:
I'll have to play with this some.Implicit in that remark was my intent to read more about pre/post decrementation and experiment until I more fully understood it. You have pointed out my lack of complete understanding, and, odd as it may seem, I appreciate that. I do log into these forums, partly, to improve my understanding of java.
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