C / C++ / MFC Discussion Boards

Re: Making an interactive periodic table of the elements using VC++

Jason Henderson25-Sep-03 9:04

25-Sep-03 9:04

I wrote up a quick and dirty demo of this conscept. I'll send it to you if you're interested. I think I'll write an article on it too.

"It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt." - Abraham Lincoln

Jason Henderson
blog | articles

Re: Making an interactive periodic table of the elements using VC++

b_girl25-Sep-03 9:24

b_girl

25-Sep-03 9:24

Yes, I'm definitely interested in seeing how you did it. I still don't completely know how I want to go about doing this, so it would be nice to have something to look at.

Thanks so much.

Re: Making an interactive periodic table of the elements using VC++

Jason Henderson25-Sep-03 9:48

Jason Henderson

25-Sep-03 9:48

Want me to send this to you via email?

"It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt." - Abraham Lincoln

Jason Henderson
blog | articles

Re: Making an interactive periodic table of the elements using VC++

b_girl25-Sep-03 9:53

b_girl

25-Sep-03 9:53

Yeah, can you send it through this, or do i have to give you my email address? (I don't mind if i have to, it's not that big of a deal really)

Re: Making an interactive periodic table of the elements using VC++

Jason Henderson25-Sep-03 10:48

Jason Henderson

25-Sep-03 10:48

Here it is:
http://www22.brinkster.com/jhenders/temp.htm

"It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt." - Abraham Lincoln

Jason Henderson
blog | articles

what is the ? thingy called?

keegan22-Sep-03 8:27

keegan

22-Sep-03 8:27

Ok, i saw the ? thing used in some code, and i dont know what it does. I tried googling, but, um, i dont know what its called, and you cant google for "c++ ?" very easily.

So, what is it called so i can google for it lol.

*.*
cin >> knowledge;

Re: what is the ? thingy called?

ZoogieZork22-Sep-03 8:32

ZoogieZork

22-Sep-03 8:32

You mean like: int foo = (blah == 2) ? 1 : 0; or something like that? If so, that's a conditional expression, referred to variously as "immediate if", the "ternary operator", the "conditional operator", or simply the "?:" operator. It's basically an "if..then..else" type of expression that returns a value. Users of functional languages are very familiar with doing conditionals like this.

- Mike

Re: what is the ? thingy called?

Michael Dunn22-Sep-03 9:04

Michael Dunn

22-Sep-03 9:04

Search for "ternary operator". It ought to be called a "trinary operator" since it takes 3 arguments, but the incorrect term "ternary" has stuck for whatever reason.

--Mike--
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Re: what is the ? thingy called?

keegan22-Sep-03 9:15

keegan

22-Sep-03 9:15

ok, so in the example above, it basically means

<br />
(if blah == 2)<br />
{<br />
   foo = 1;<br />
}<br />
else<br />
{<br />
   foo = 0;<br />
}<br />
<br />

pretty neat...thanks-o.

*.*
cin >> knowledge;

Re: what is the ? thingy called?

Michael Dunn22-Sep-03 11:03

Michael Dunn

22-Sep-03 11:03

That is correct Smile | :)

--Mike--
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
CP SearchBar v2.0.2 released

Re: what is the ? thingy called?

22-Sep-03 9:19

Hi,

do you mean the ? : operator???? Smile | :)

This is just an abbreviation for an if else statement used in C++. Consider the following for example:

return x = a ? b< c : d > a;

In this case x is either (b<c) or="" (d="">a) depending on the programming return value.
Hope it helps.
Regards.
Alex

MSXML

act_x22-Sep-03 8:14

act_x

22-Sep-03 8:14

I was able to redistribute MSXML4 using a msi package. everything worked ok till i was working as administrator on a Windows 2000 box , when I logged on as a user I got an error in the XML part of the code saying that the object couldnt be created ! What do i need to do ?

Re: MSXML

JWood22-Sep-03 9:21

JWood

22-Sep-03 9:21

Might be a permissions issue. Do you have the error code?

Re: MSXML

act_x22-Sep-03 9:32

act_x

22-Sep-03 9:32

I am pretty confidant its bcos of permissions or things not getting setup globally ( like for all users , admins etc ) .

hr=m_plDomDocument.CreateInstance("Msxml2.DOMDocument.4.0");

if(FAILED(hr)){
::MessageBox(0,"Failed Dom Document CreateInstance",0,0);

I get the messageBox indicating an error while running as an User .

As an user I cannot even get access permissions to install the MSXML cab redistribution file to write certain registry keys !

Re: MSXML

JWood22-Sep-03 10:03

JWood

22-Sep-03 10:03

You might want to check with the XML/XSL forum on this website.

Threads

Anonymous22-Sep-03 7:55

Anonymous

22-Sep-03 7:55

I don't know much about thread programming, but I have a general question. Are threads more of an operating system function. For example there isn't any thread functions in the STL are there? Wouldn't threads be dealt with differently on Linux and Windows?

Thanks.

Re: Threads

David Crow22-Sep-03 8:04

David Crow

22-Sep-03 8:04

Anonymous wrote:
For example there isn't any thread functions in the STL are there?

Correct.

Anonymous wrote:
Wouldn't threads be dealt with differently on Linux and Windows?

While the implementation between the two OSs would no doubt be different, I suspect the net result of each would be somewhat similar.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: Threads

ASchunk22-Sep-03 8:16

ASchunk

22-Sep-03 8:16

Hi,

yes threads are part of the Operating system. Windows for example handles threads in a different manner than Unix or Linux does. Windows assigns to each thread a certain amount of time during which this thread can perform its task. If there are multiple threads at one time Windows determines which thread has priority of the others and executes this thread. Linux and Unix handle threads differently. The stl can also handle threads yet it does not have a special class or library that deals with threads. You have to write your own thread managing class or library.

Re: Threads

Anonymous22-Sep-03 9:39

Anonymous

22-Sep-03 9:39

Thanks for the information.

Parse a binary number

NewHSKid22-Sep-03 7:51

NewHSKid

22-Sep-03 7:51

Hi all,

I was wondering if there was a way to parse a binary number that I receive over a TCP port, into either 4 bit chunks or into hex.

Thank you.

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Parse a binary number

David Crow22-Sep-03 8:11

David Crow

22-Sep-03 8:11

DWORD dwSome32BitNumber;
 
WORD wFirstChunk  = dwSome32BitNumber & 0x0000000f;
WORD wSecondChunk = (dwSome32BitNumber >> 8) & 0x0000000f;
WORD wThirdChunk  = (dwSome32BitNumber >> 16) & 0x0000000f;
WORD wFourthChunk = (dwSome32BitNumber >> 32) & 0x0000000f;
...

Does that make sense? Or you could dress it up a bit with:

WORD wChunks[8];
for (int nIndex = 0; nIndex< 8; nIndex++)
{
    wChunks[nIndex] = dwSome32BitNumber & 0x0000000f;
    dwSome32BitNumber >>= 8;
}

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: Parse a binary number

NewHSKid22-Sep-03 8:36

NewHSKid

22-Sep-03 8:36

Hi David,

Can you explain this to me a little more.

I think I understand , but I am not exactly sure what the dwSome32BitNumber >> 8 (16,32) or dwSome32BitNumber >>= 8 does exactly with respect to the &0x00000000f.

thanks again for your help

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Parse a binary number

David Crow22-Sep-03 8:41

David Crow

22-Sep-03 8:41

>> and << are right and left bit-shift operators, respectively. Read about them here:

http://tinyurl.com/o94p

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: Parse a binary number

NewHSKid22-Sep-03 8:50

NewHSKid

22-Sep-03 8:50

I'm sorry, I posted my message incomplete.

I updated the previous post. My question basically is if you are you the bitwise & operator with the first 8bits of the number, won't it end up being 0?

So i guess my real question is what does the & 0x00000000f do after the number has been shifted 8 (16, 32)?

thank you

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Parse a binary number

David Crow22-Sep-03 8:54

David Crow

22-Sep-03 8:54

NewHSKid wrote:
...what does the & 0x00000000f do...

Read about the bitwise-AND operator here:

http://tinyurl.com/o96t

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

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