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➜ SMAUG
➜ SMAUG coding
➜ Question on ? "$" :
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Posted by
| Azrith
(15 posts) Bio
|
Date
| Tue 04 Feb 2003 10:30 PM (UTC) |
Message
| Hey everyone!
I was wondering if someone could give me a little more info as to what exactly the ? "$": does in the line
filename = feof( fpList ) ? "$" : fread_word( fpList );
This line is with
filename = feof( fpList ) ? "$" : fread_word( fpList );
if ( filename[0] == '$' )
break;
Thanks!
Kyle
| Top |
|
Posted by
| Azrith
(15 posts) Bio
|
Date
| Reply #1 on Wed 05 Feb 2003 01:24 AM (UTC) |
Message
| PS :)
I realize the "$" is the end of file so is it saying if $ is found then filename = EOF otherwise filename = fread_word?
Thanks! | Top |
|
Posted by
| Nick Gammon
Australia (23,133 posts) Bio
Forum Administrator |
Date
| Reply #2 on Wed 05 Feb 2003 06:56 AM (UTC) |
Message
| What they are saying is that a file *should* end with "$" but if it doesn't, in other words, if feof is true, then simulate that by putting a "$" into filename, otherwise read a filename from the file.
Then the subsequent test just tests for a "$" and doesn't have to test for end-of-file as well. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | Top |
|
Posted by
| Dave
Australia (93 posts) Bio
|
Date
| Reply #3 on Fri 07 Feb 2003 10:11 PM (UTC) Amended on Fri 07 Feb 2003 10:13 PM (UTC) by Dave
|
Message
| The ? and : thing is called the ternary operator, and it's a short-hand form of a simple if-then-else. For example:filename = feof(fpList) ? "$" : fread_word(fpList);
Could be written as:
if (feof(fpList))
filename = "$";
else
filename = fread_word(fpList);
Like many things in C, the ternary operator can be abused. I've seen massively-nested ?:'s which, while amusing, were certainly unreadable. For more information, google for "ternary operator".
Hope this helps,
Dave | Top |
|
Posted by
| Azrith
(15 posts) Bio
|
Date
| Reply #4 on Sun 09 Feb 2003 01:49 AM (UTC) |
Message
| Thanks for all the help everyone :)
Ya I remember going over this a long time ago I had just forgotten.
Thanks again! | Top |
|
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