<div>thank you for your replying</div><div>does call/cc always working with let/ec?</div><div>when it comes to compare with your code, it looks like..</div><div>call/cc is meaning of "get out of this function and evaluate next function and comeback (to inside of let/ec) for evaluate rest of the code"</div> <div>is it right?</div><div><br></div><div>if so, I don't understand why </div><div><br></div><div>following code does not working properly</div><div>#lang scheme</div><div><br></div><div>(require racket/gui)</div><div> <br></div><div>(define (aa) #t #f "11")</div><div><br></div><div>(dynamic-wind</div><div> (lambda () (display "in "))</div><div> (lambda ()</div><div> (display "pre ")</div><div> (let/ec out</div> <div> </div><div> (display (call/cc out)))</div><div> (display "1")</div><div> (display "2")</div><div> (display "3")</div><div> )</div><div> (lambda () (display "out ")))</div> <div><br></div><div>but the following code works weird</div><div>#lang scheme</div><div>(require racket/gui)</div><div>(define (aa) #t #f "11")</div><div>(dynamic-wind</div><div> (lambda () (display "in "))</div> <div> (lambda ()</div><div> (display "pre ")</div><div> (let/ec out</div><div> (display (call/cc out)))</div><div> (display "1")</div><div> (display "2")</div><div> (display "3")</div> <div> "1")</div><div> (lambda () (display "out ")))</div><div><br></div><br><div class="gmail_quote">2010년 10월 18일 오후 7:59, Jos Koot <span dir="ltr"><<a href="mailto:jos.koot@telefonica.net">jos.koot@telefonica.net</a>></span>님의 말:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> <div> <div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">Compare yoiur code with:</font></span></div> <div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial"></font></span> </div> <div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">#lang scheme</font></span></div><span><font color="#0000ff" size="2" face="Arial"> <div dir="ltr" align="left"><br>(require racket/gui)</div> <div dir="ltr" align="left"><br><div class="im">(dynamic-wind<br> (lambda () (display "in "))<br> (lambda ()<br> (display "pre ")<br></div> (let/ec out<div class="im"><br> (display (call/cc out)))<br> #f)<br> (lambda () (display "out ")))</div></div></font></span></div> <div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial"></font></span> </div> <div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">Jos</font></span></div><br> <blockquote style="border-left:#0000ff 2px solid;padding-left:5px;margin-left:5px;margin-right:0px" dir="ltr"> <div dir="ltr" lang="en-us" align="left"> <hr> <font size="2" face="Tahoma"><b>From:</b> <a href="mailto:users-bounces@racket-lang.org" target="_blank">users-bounces@racket-lang.org</a> [mailto:<a href="mailto:users-bounces@racket-lang.org" target="_blank">users-bounces@racket-lang.org</a>] <b>On Behalf Of </b>???<br><b>Sent:</b> 18 October 2010 12:41<br><b>To:</b> <a href="mailto:users@racket-lang.org" target="_blank">users@racket-lang.org</a><br><b>Subject:</b> [racket] how does call/cc and let/ec exactly works?<br></font><br></div><div><div></div><div class="h5"> <div></div> <div>hello </div> <div>I am thinking of such a code like..</div> <div>#lang scheme</div> <div>(require racket/gui)</div> <div>(let ([v (let/ec out</div> <div> (dynamic-wind</div> <div> (lambda () (display "in "))</div> <div> (lambda ()</div> <div> (display "pre ")</div> <div> (display (call/cc out))</div> <div> #f)</div> <div> (lambda () (display "out "))))])</div> <div> (when v (v "post ")))</div> <div><br></div> <div>but I still have no idea how </div> <div>"in pre out in post out " is printed but not "in pre out in pre post out "</div> <div>how does call/cc and let/ec exactly works?</div> <div><br></div></div></div></blockquote> </blockquote></div><br>