Re: help with c++ if test

  • From: "Kristoffer Gustafsson" <kg84@xxxxxxxxxxxx>
  • To: <programmingblind@xxxxxxxxxxxxx>
  • Date: Wed, 9 Feb 2011 20:17:07 +0100

Hi.
Yes, I've heard that goto is bad a lot of times. But it is goto that I know how 
it works, and I'll use goto in my text games.
So can you please help me to see what is wrong with the code I sent?
I want to jump between labels with goto.
/Kristoffer
  ----- Original Message ----- 
  From: Sina Bahram 
  To: programmingblind@xxxxxxxxxxxxx 
  Sent: Wednesday, February 09, 2011 8:10 PM
  Subject: RE: help with c++ if test


  Yes, regardless, goto is bad.

   

  But absolutely you can break out of the inner loop, but then you'll be in the 
top level loop, in which you can do a conditional.

   

  This is still more efficient, since it is definitionally true that you would 
do a check in the inner loop before your goto, and if you are doing a check in 
the inner loop, then that means you are doing a check M*n times, where m and n 
are the dimensions of the outer and inner loops, respectively.

   

  If you remove that, and simply do the check in the outer loop, then you are 
only doing a check m times, which is an entire order of complexity better.

   

  Goto is bad. This is the one rule where because I say so and other inane 
excuses from teachers is acceptable. Goto is just bad. There is no reason, 
none, what-so-ever, that you need one.

   

  Now, if we get into kernel programming where assembler is being linked in, 
etc, etc, then we can talk . but in something as straight forward and earth 
shatteringly simple as the logic for an adventure game? Goto is absolutely in 
no way necessary under any possibly conceivable permutations.

   

  Take care,

  Sina

   

   

   

  From: programmingblind-bounce@xxxxxxxxxxxxx 
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Littlefield, Tyler
  Sent: Wednesday, February 09, 2011 2:05 PM
  To: programmingblind@xxxxxxxxxxxxx
  Subject: Re: help with c++ if test

   

  Sina:
  Break is awesome when you have one single loop, but you can't break out of 
two loops, can you? It was just the first thing that came to mind because I've 
seen it used (and used it) like that.

  On 2/9/2011 11:50 AM, Sina Bahram wrote: 

  tyler, this is a horrible example of goto, my friend. 

    

  That's what break is for. 

    

  Take care, 

  Sina 

    

  From: programmingblind-bounce@xxxxxxxxxxxxx 
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Littlefield, Tyler
  Sent: Wednesday, February 09, 2011 1:17 PM
  To: programmingblind@xxxxxxxxxxxxx
  Subject: Re: help with c++ if test 

    

  I really really highly recommend you avoid goto. This isn't basic, and 
they're not very useful except for in some odd cases, far and few between. Such 
as jumping out of two nested loops like so:
  int i, j;
  for (i = 0; i < 100; i++)
  {
  for (j = 0; j < 100; j++)
  {
  if (i+j == 100)
  goto botttom;
  }
  }
  bottom:
  //do something here
  if you want to compare strings, do something like this:
  if (input == "north")
  {
  GoNorth();
  }
  else if (input == "south")
  ...
  else ...



  On 2/9/2011 10:52 AM, Kristoffer Gustafsson wrote: 

  Hi. 

  I'm writing if tests in c++ with the goto command. 

  I want to do text games and I'm using these commands for that. 

  But it doesn't work, so I must do something wrong. 

  Can you give me an example how this is done with a string please? 

  /Kristoffer 





--      Thanks,  Ty  




--  Thanks,Ty

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