How to continue a line

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2.25/5 (4 votes)

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I'm trying to continue a line of code and get seem to get the right syntax. Any help is appreciated. Thank you.

C++

if (( flags & 0x01 && flags & 0x10 ) && (ip_header->destination_ip == *addressValue)) / 
||(( flags & 0x02 && flags & 0x10 ) && (ip_header->destination_ip == *addressValue))/
||(( flags & 0x08 && flags & 0x10 ) && (ip_header->destination_ip == *addressValue))
			{

Posted 21-Sep-11 9:37am

Member 7766180

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4 solutions

Solution 3

redact the whole thing down to one check?

// or 0x10, 1, 2 & 8 to 0x1b
if (( flags & 0x1b ) && (ip_header->destination_ip == *addressValue))
{
}

Posted 21-Sep-11 17:07pm

barneyman

Comments

Chuck O'Toole 22-Sep-11 1:03am

Nope, all his include "flags & 0x10" so the only legal values are 0x11, 0x12, 0x18. Your change would allow invalid combos of 0x01, 0x02, 0x08, and 0x10.

barneyman 22-Sep-11 1:06am

true!

Stefan_Lang 22-Sep-11 7:42am

make it

if ((flags & 0x0B) && (flags & 0x10) && ip_header->destination == *addressValue)

The last two conditions are mandatory, the first assembles the 'or' conditions into one term like what you tried.

Member 7766180 22-Sep-11 13:45pm

This looks like something I could apply over and over again... just a little confused on the first line though. If its rem out // how is it read? Thank you!

Stefan_Lang 23-Sep-11 3:46am

The character sequence // introduces a one-line comment that will be ignored by the compiler. You can also use the character sequences /* and */ to indicate the start and end of a comment, respectively.

The solution above made an attempt to simplify the boolean expression in your if statement. To understand that transformation you must understand Boolean Logic.

This, as well as the above (about comments) is yet another thing that you cannot learn just from looking at code. I can just repeat what others have already pointed out: get yourself a good book or Tutorial!

Solution 4

As stated earlier, you don't need the continuation for code, however you would need it for strings.

Either way, the continuation character (to continue a line on the following line) is a \ instead of /. The \ is the escape character (as in \n, \r, etc), and in this case it indicates that the next character (end of line) is "special" - i.e. not included.

Hope that helps.

Posted 22-Sep-11 2:17am

krmed

Comments

Member 7766180 22-Sep-11 13:43pm

Thank you! I'm learning lot about end of lines! I appreciate it!

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BillW33 · Accepted Answer · 2011-09-21T10:19:00

Solution 1

You don't need to use a continuation symbol in C++ to continue a line of code. C++ will ignore white space.
So leave out the extra symbols and it should work.

You do need the slash for continuing a string on multiple lines, that is likely what confused you.

Posted 21-Sep-11 10:19am

BillW33

Updated 21-Sep-11 10:26am

v2

Comments

Member 7766180 21-Sep-11 17:18pm

There was also a problem with the "(".....
if (( flags & 0x01 && flags & 0x10 ) && (ip_header->destination_ip == *addressValue)
|| ( flags & 0x02 && flags & 0x10 ) && (ip_header->destination_ip == *addressValue)
||( flags & 0x08 && flags & 0x10 ) && (ip_header->destination_ip == *addressValue))

Sergey Alexandrovich Kryukov 21-Sep-11 17:43pm

A fix:


if (
(( (flags & 0x01) && (flags & 0x10) ) && (ip_header->destination_ip == *addressValue))
||
(( (flags & 0x02) && (flags & 0x10) ) && (ip_header->destination_ip == *addressValue))
||
(( (flags & 0x08) && (flags & 0x10) ) && (ip_header->destination_ip == *addressValue))
)

--SA

Member 7766180 21-Sep-11 18:07pm

Thank you. I appreciate the help. Sincerely. 7766180

Sergey Alexandrovich Kryukov 21-Sep-11 19:54pm

You're welcome. I'm trying to help -- sincerely. :-)
--SA

Stefan_Lang 22-Sep-11 7:37am

Or:

if ((flags & 0x0B) && (flags & 0x10) && ip_header->destination == *addressValue)

Ok, not related to the problem, but I couldn't pass by that expression without optimizing it a bit ;-)

P.S.: seems like I couldn't even wait to read to the end of the page (solution 3), ^^

Albert Holguin 22-Sep-11 14:50pm

+5, worth noting that macros (pre-processor directives) do require the '/' if going beyond one line.

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-09-21T10:27:00

Does it makes sense to start this line, that is a question. :-)

I really think it does not make sense. If you ever took a labor of reading any C++ or C manual, you would know from the very beginning that there are no lines in C++ or C; the end of line in the file is treated the same way as blank space or, say, tab. Any language construct can take any number of lines; you only should not break literals, reserved words and identifiers (names). Just remove all those '/' at the end. (Where did you get them? They look familiar… From some other language? Who told you can or need to use them in C++ or C?)

I think it does not make sense because you apparently try to code without reading one of those manuals; and that makes no sense. It will really lead you nowhere. Do yourself a favor, read such manual, practice a bit on simple samples and come back. Honestly.

[EDIT]

Wait a second! I remember you! You already asked 113 questions! You try to write TCP packets and modify Windows registry! What's going on? You either try to troll all us or just waste your time and our time. Please, do yourself and all us a favor: stop all this, get yourself busy with something useful. Learn some programming for example — you're not doing it. Learn from scratch and with no rush, otherwise it leads you nowhere. At least think about it.

Best wishes,

—SA

How to continue a line

4 solutions

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Solution 2

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