C / C++ / MFC Discussion Boards

Re: Calculate factorial of any number less than 10000,but I don't know how to start with?

CPallini15-Oct-09 22:52

CPallini

15-Oct-09 22:52

Start making space for a lot of digits... Roll eyes | :rolleyes:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Calculate factorial of any number less than 10000,but I don't know how to start with? [modified]

CPallini15-Oct-09 23:05

CPallini

15-Oct-09 23:05

forPower wrote:
Calculate factorial of any number less than 10000,but I don't know how to start with?

Start with 1!. Big Grin | :-D

With standard C, using an (or ~~two~~ three... Roll eyes | :rolleyes:

) array of (circa) 40000 unsigned chars you may roll you own-hand-crafted computation, anyway I doubt the output will be produced in 1 ms... Smile | :)

modified on Friday, October 16, 2009 5:16 AM

Re: Calculate factorial of any number less than 10000,but I don't know how to start with?

David Crow16-Oct-09 3:05

David Crow

16-Oct-09 3:05

Can you calculate factorials on paper? Until you get that much squared away, trying to write code is just going to get in your way.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: Calculate factorial of any number less than 10000,but I don't know how to start with?

Maximilien16-Oct-09 3:06

Maximilien

16-Oct-09 3:06

0- do you know what a factorial is ?
0.5- did you google/bing about that ?
1- do you know how to calculate factorial on paper ?
2- can you translate that into code ?
2.5- did you even try something ?

anyway, don't use recursion.

This signature was proudly tested on animals.

Re: Calculate factorial of any number less than 10000,but I don't know how to start with?

Rajesh R Subramanian16-Oct-09 3:58

Rajesh R Subramanian

16-Oct-09 3:58

Maximilien wrote:
2- can you translate that into code ?
2.5- did you even try something ?

Unfortunately I think that in this specific case, just translating the factorial logic into code simply won't work. If we use the datatypes that are available to us, and assuming that we use a 64 bit unsigned integer, the largest number that it can hold would be barely sufficient to hold the value of 20 factorial. For holding the resultant value of the computation of 40 factorial, there are no datatypes offered by the tools and languages used usually (it would be larger than what an 128 bit integer can hold!)

And the OP wants to find the factorial of not 40, but the factorial of *cough* 10000. The way I know of is to use arbitrary precision arithmetic and the OP didn't know it. He just wanted to know how to get started with it.

However, I do agree with you that he could have done a bit of Googling around.

“Follow your bliss.” – Joseph Campbell

Re: Calculate factorial of any number less than 10000,but I don't know how to start with?

Maximilien16-Oct-09 4:02

Maximilien

16-Oct-09 4:02

well, if the OP cannot even code a simple factorial for small numbers, then defining it for large numbers is secondary.

This signature was proudly tested on animals.

Re: Calculate factorial of any number less than 10000,but I don't know how to start with?

David Crow16-Oct-09 4:22

David Crow

16-Oct-09 4:22

Maximilien wrote:
well, if the OP cannot even code a simple factorial for small numbers...

That's what I inferred from his post, too.

Outlook contacts

Anil Kumar.Arvapalli15-Oct-09 19:59

Anil Kumar.Arvapalli

15-Oct-09 19:59

I want to fill contacts in outlook through programatically i,e by using Mapi can anybody provide me some samples so that iam aware of things..... Thanks in Advance...

Re: Outlook contacts

CPallini15-Oct-09 20:58

CPallini

15-Oct-09 20:58

The CP article search engine is wonderful...[^].
Smile | :)

Re: Outlook contacts

Richard MacCutchan15-Oct-09 22:08

Richard MacCutchan

15-Oct-09 22:08

It's all described here[^].

unicode exe with ansi dll

includeh1015-Oct-09 18:01

includeh10

15-Oct-09 18:01

It sounds that MFC auto swiches unicode/ansi lib and dll for main unicode/ansi exe (not sure).

My question:

Is it OK if main exe is unicode but user dll is ansi format?
Should I change user dll to unicode also?

Re: unicode exe with ansi dll

Hans Dietrich15-Oct-09 19:14

Hans Dietrich

15-Oct-09 19:14

If you are not passing strings to/from the dll, then there's no reason to change. If you are passing strings, then you must either always convert strings, or change dll to compile with UNICODE.

In general, changing dll to match exe is the better approach. Just add a "Unicode" project in the IDE, so you can choose which to build. Your dll should be named appropriately - e.g., MYDLLA.DLL, MYDLLU.DLL - for the Ansi and Unicode versions.

Best wishes,
Hans

[Hans Dietrich Software]

UNICODE setting for win32

includeh1015-Oct-09 17:54

includeh10

15-Oct-09 17:54

In MFC, unicode project is with option (1)_UNICODE and (2)wWinMainCRTStartup.

setting (1) can be used for win32, but (2) can't, because it is for MFC.

If without (2), win32 project is not real unicode - test by ansi string in function MessageBox(0,"ppppp","nnnn",MB_OK); and no compile errors.

What is similar setting of (2)wWinMainCRTStartup for win32 project?

Re: UNICODE setting for win32

Hans Dietrich15-Oct-09 19:04

Hans Dietrich

15-Oct-09 19:04

From MSDN:

Visual C++ supports defining a wmain function
and passing wide-character arguments to your Unicode 
application. You declare formal parameters to wmain, using 
a format similar to main. You can then pass wide-character 
arguments and, optionally, a wide-character environment 
pointer to the program. The argv and envp parameters to 
wmain are of type wchar_t*. For example:

wmain( int argc, wchar_t *argv[ ], wchar_t *envp[ ] )

Best wishes,
Hans

[Hans Dietrich Software]

Re: UNICODE setting for win32

includeh1015-Oct-09 23:54

includeh10

15-Oct-09 23:54

But how to change it from project settings as in MFC?

manually change main to wmain, WinMain to WWinMain, DllMain to WDllMain?

Minimum size alignment of exe or dll file.

includeh1015-Oct-09 17:39

includeh10

15-Oct-09 17:39

exe/dll file size alignment is 512 bytes with option /OPT:NOWIN98.

Is 512 bytes minimum size alignment for exe/dll?
I hope change it to smaller, how to do it?

Re: Minimum size alignment of exe or dll file.

Joe Woodbury15-Oct-09 17:54

Joe Woodbury

15-Oct-09 17:54

16 is the minimum size, but IIRC making it smaller than 512 can cause problems. (I also vaguely recall trying 16 on a project and running into a linking issue.)

Re: Minimum size alignment of exe or dll file.

includeh1015-Oct-09 18:04

includeh10

15-Oct-09 18:04

Hi Joe, thanks.

I'd like to do a test, could you provide info for how to change the align size?
What does IIRC mean? Smile | :)

Re: Minimum size alignment of exe or dll file.

Joe Woodbury15-Oct-09 18:13

Joe Woodbury

15-Oct-09 18:13

IIRC - If I remember correctly

To change the alignment use the linker option /ALIGN:xxx

How to make UTF-8 converted to Unicode?

wangningyu15-Oct-09 15:18

wangningyu

15-Oct-09 15:18

Dear .

Here I have a HTML web page file,such as "MyWeb.html".

Now I read it into CString object,and use to Find some chinese characters.For example:

CString    str="";
CStdioFile file;
CString    strLine="";
if(!file.Open("MyWeb.html",CFile::modeRead | CFile::typeText,NULL))
{
CString strTemp;
strTemp.Format("Open file error:%d",GetLastError());
MessageBox(strTemp);
    return;
}

while(file.ReadString(strLine)){
    str = str + strLine;
}

MessageBox(str);
if(str.Find("some chinese characters.")>=1){
    MessageBox("the characters is in the file.");
}
file.Close();

My operate system is Chinese Simplified,but this web page is utf-8.when use MessageBox to display all Cstring characters,the english characters display correctly ,but the chinese isn't,is all garbled.

Now what can I do ?

thanks !

Best Reguards !

Re: How to make UTF-8 converted to Unicode?

includeh1015-Oct-09 17:34

includeh10

15-Oct-09 17:34

did you set your project setting as _UNICODE?

Re: How to make UTF-8 converted to Unicode?

Michael Schubert15-Oct-09 21:31

Michael Schubert

15-Oct-09 21:31

Have a look at this class:
CStdioFile-derived class for multibyte and Unicode reading and writing[^]

Please lent me some idea.. [modified]

mr bard215-Oct-09 14:59

mr bard2

15-Oct-09 14:59

i wanted to do an asignmnt which are look like this!

pictures:
http://lookpic.com/i/974/bowPXhWd.jpeg

from that pictures...the box 1 and 2...what should i use to make that?? edit control or richedit or static box or else??
the box 1 is for the data text...and the box two are for the display of the data 2...like animation>typewritter...

program file:
http://www.mediafire.com/?ymdzm2tjmdn

for your infomation..the box 1 are the text data...that the box 2 are display...

this are my first try...i did not know how to add function to the box...
http://lookpic.com/i/310/qXtrzfLG.jpeg

please lent me some idea..
for your information, i'm new with VS C++
Thanks!

modified on Thursday, October 15, 2009 9:45 PM

Re: Please lent me some idea..

Richard MacCutchan15-Oct-09 22:14

Richard MacCutchan

15-Oct-09 22:14

Take a look here[^] at some of the tutorials on The Code Project; they should offer lots of ideas.

Gettextextent and Screen resolution

ForNow15-Oct-09 12:32

ForNow

15-Oct-09 12:32

Hi,

I had some code that I was using on a machine with a Low resolution I populated some data in a Rich Edit control

and aligned up things with GetTextExtent

Now when I ported the code to a machine with a higher resolution the text doesn't align properly

Thought GetTextExtent takes things like that into consideration

The one other difference is that the higher resolution machine runs Vista

Do I have to use GetDeviceCaps ???

thankx

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