While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.
So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.
Start by looking at the problem and working out what the output actually is:
Index: 0 1 2 3 4 5 6 7 ...
Print: 0 3 2 5 4 7 6 9 ...
So, that boils down to:
If the index is even, print it. If it's odd, print it plus 2.
So all you need is a simple
for
loop, and a way to tell is a value is odd or even.
There are two ways to do that: modulus (the
%
operator in C) and binary AND (the
&
operator in C).
Think abotu it and you'll see what I mean.
If you are having problems getting started at all, then this may help:
How to Write Code to Solve a Problem, A Beginner's Guide[
^]