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A static variable is local to particular function. However, it is only initialised once (on the first call to function).
Also the value of the variable on leaving the function remains intact. On the next call to the function the the static variable has the same value as on leaving.
This is the definition I got on one of the websites
Static sounds like a CONSTANT. Replacing static with a constant sounds like the same thing.
Does that make sense to you guys????
-- modified at 14:41 Thursday 29th June, 2006
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Jay03 wrote: Does that make sense to you guys????
not at all !!
void inc() {
static iCpt = 0;
iCpt++;
printf("%d\n", iCpt);
}
void main(void) {
for (int i = 0; i < 10; i++) {
inc();
}
}
this code actually prints :
1
2
3
4
...
TOXCCT >>> GEII power
[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]
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Jay03 wrote: Static sounds like a CONSTANT.
No. They are different. I think you misunderstood "it is only initialised once". Look at this example:
YourFunction()
{
static int st = 0;
st++;
}
You sound pretty new to C/C++. Get a book and study it more systematically.
Best,
Jun
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Jay03 wrote: Static sounds like a CONSTANT.
Not even close. When a variable has static duration, it is allocated when the program begins and deallocated when the program ends. A const variable specifies that the variable is not modifiable.
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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I am using visual c++ 6.0;
I want to print numbers with thousand separator, what format to use.
I have float variables that i want to print like these:
252,000.00
150,250.25
What to do ?
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If this is with a Win32 application, use GetNumberFormat(). Otherwise, you'll need to roll your owwn.
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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Hi all,
I downloaded EasyInstaller2 and NSIS, too,
but they are too difficult to me.
Could anybody explain to me how to use
one of the two to create an installer for
my Visual C++/MFC .NET project ?
Thanx in advance,
Desmo16.
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How about XCOPY?; After all, .Net was touting "the end of DLL Hell" and "XCOPY deployment"... 
Seriously, I am not familiar with either of those installers - I use Wise.
Peace!
-=- James
If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
DeleteFXPFiles & CheckFavorites (Please rate this post!)
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Hi,I want to write COM dll..for serial port communication of an instrument,i want write code to open,close,read and write data to port in the DLL.I want valueable suggestions..guidence..to start..
I request any existing articles on this..so that they can be useful to me..
thanks in before
James
-- modified at 13:01 Thursday 29th June, 2006
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Start here.
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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thanks for the response..David is there any sample application..for the given article
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RockyJames wrote: ...is there any sample application..for the given article
Did you read it? Near the bottom it states:
"There is no download because copy-and-paste from this page should suffice."
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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yeah i have..read..thanks for the article..Can i expect any more suggestions like how to start..i want the basic push up..then later on i hope i can handle.it..
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here
That article is more about creating pluggable COM components, but the source code has a serial port component that will fill your needs.
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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i am new to COM,i want to develop a DLL in COM for serial port communication,the component side, i want to write code,for opening the COM port,closing,sending and receiving the Data,from the client side i want to use this DLL./and just call the respective function of the DLL..can u please suggest me..how to use your serial communication interface..
thanks in before..
james
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That is what those components do. There are 3 COM components and 1 client app in the demo code for that article. The app itself is very straight-forward. Instead of looking for the components of a specified category, just import the serial port one into your project and initialize it the same way it is done in the application.
Have you written serial port code before? If not, you may want to start by writing a class to communicate with the serial port prior to jumping into COM.
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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can i use u r serial communication class directly ,instead of developing new one..?
-- modified at 19:21 Thursday 29th June, 2006
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Serial communication in Windows is handled just like a file. You use OpenFile/CreateFile to open the port, and ReadFile/WriteFile to read from and write to it. The classes people develop just wrap these operations into easy to use methods.
So, yes, you can easily just use the Win32 API directly if you would like.
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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yeah i am planing to use OpenFile/CreateFile,ReadFile,WriteFile and other API functions,do we need to write two threads,for reading and writing and how do we spool the data.I want write everthing in a DLL and use this DLL,in a client application,by calling respective functions,i want to open com port,send,and read from it....
Thanks in Before
james
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need to add some images thumbnail to CImageList
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If you use the Bitmap class instead of the Image class you can use the GetHBitmap or GetHIcon methods to get an HBITMAP or HICON that you can add to your image list. The Bitmap class inherits from the Image class so all the functionality of the Image class is available in the Bitmap class.
You may be right
I may be crazy
-- Billy Joel --
Within you lies the power for good, use it!!!
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Hello everyone,
I am working on a code related to binary trees (data structures) and there is a small part of it that I can't undserstand because of its strange syntax.
To make things easier for somebody who may help I abstracted this part of code and made it simple and stand alone but still keeping that strange syntax! Looking the output I know what the code does but I cannot understand its syntax at all. I am giving the code below with questions for the lines I don't understand:
<br />
#include <iostream><br />
#include <string><br />
<br />
using namespace std;<br />
<br />
void PreOrder(void(Visit_) (int *s), int *s){<br />
<br />
Visit_(s); <br />
}<br />
<br />
static void Output_(int *t)<br />
{cout << *t << 'Z';} <br />
<br />
<br />
int main(){<br />
<br />
<br />
int *p;<br />
int i=5;<br />
<br />
p=&i;<br />
<br />
PreOrder(Output_, p);<br />
<br />
<br />
getchar();<br />
return 0; <br />
}<br />
I would appreciate it a lot if anyone could explain even a single line, maybe then I can understand the whole image my self.
Thank you all in advance,
Melsi
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void(Visit_) (int *s) is the function pointer (which accepts int* as its paramter) declared (very firstly) as the function parameter.
You are passing PreOrder(Output_, p);
Output_ as the function address to execute
Visit_(s);
here the execution begins.
There's nothing strange inside. the confusing thing nobody is used to define the function poiner as the parameter.
Hope I answered you
SaRath.
"It is your attitude, not your aptitude, that determines your altitude - Zig Ziglar."
My Blog | Understanding State Pattern in C++
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Sarath.<fon wrote:<="" div="">There's nothing strange inside. the confusing thing nobody is used to define the function poiner as the parameter.
Usually these are typedef'd to make the code easier to read.
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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