<div dir="ltr">I am back again. I had a basic inquiry and your help got me started.<div><br></div><div>My problem is as follows:</div><div><br></div><div><b>I have just started to work through 2Htdp (i.e. the second edition) that you had guided me to. Having gone through the prologue I am now on the second chapter, "Fixed-size data." But have got stuck almost at the start. I have successfully done the first two exercises but have hit a road block on exercise 3 (section 2.1.3 "Mixing it up"). I do not know what instruction to use to insert or extract a letter from the ith position. I think I am doing something wrong when trying to look up things in Helpdesk. Please help.</b></div> <div><b><br></b></div><div><b>Saad<br></b><br><div class="gmail_quote">On Fri, Apr 27, 2012 at 8:32 PM, Danny Yoo <span dir="ltr"><<a href="mailto:dyoo@cs.wpi.edu" target="_blank">dyoo@cs.wpi.edu</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Fri, Apr 27, 2012 at 11:27 AM, saad bashir <<a href="mailto:bashir.saad@gmail.com">bashir.saad@gmail.com</a>> wrote:<br> > Your help was great. Things are working now. And a great thank you for<br> > leading me to the 2d edition of How to Design Programs. I had not known<br> > about it.<br> <br> <br> </div>Glad to hear that it's working for you now! Please feel free to<br> continue to ask questions on the mailing list; we'll be happy to help.<br> </blockquote></div><br></div></div>