C / C++ / MFC

14-Sep-09 23:39

Ok,well i needed to write a program to display all alphabets,ie A to Z and i got a question(s) to ask.

The program i wrote is as follow :

#include<iostream>
using namespace std;
int main()
{
char letter='A';

while(letter<='Z')
{
cout<<letter;
letter++;

}

return 0;
}

1) The part where i bold-ed, why is there a need to put in the sign '...'?I tried running it without the '...' sign but the program won't run. It says its undeclared.

2)From (1),whats the difference if i put ".." instead of '...'?

3)If i were to declare something of type int,say "count=1".Why will the program run with count=1 and NOT run if i put count='1'.(see (4)where i put a '...' sign before and after the 0/26 after count)

4)If i were to modify my program into the following :

#include<iostream>
using namespace std;
int main()
{
char letter='A',count='0';

while(count<='26')
{
cout<<letter;
letter++;
count++;
}

return 0;
}

the whole program keeps running and i need to restart my laptop as the compiler somehow stuck. Why?

Thanks for answering. Big Grin | :-D

CPallini15-Sep-09 0:02

15-Sep-09 0:02

UKM_Student wrote:
he part where i bold-ed, why is there a need to put in the sign '...'?

Because that's (with one letter inside the quotes) the syntax for character constants, see [^].

UKM_Student wrote:
I tried running it without the '...' sign but the program won't run. It says its undeclared.

That's fine: without the quotes, A is no more a character constant, but instead an undeclared identifier.

UKM_Student wrote:
2)From (1),whats the difference if i put ".." instead of '...'?

Double quotes are used for string literals [^].

UKM_Student wrote:
3)If i were to declare something of type int,say "count=1".Why will the program run with count=1 and NOT run if i put count='1'.(see (4)where i put a '...' sign before and after the 0/26 after count)

The program will run in both cases, generating, of course, different outputs.

UKM_Student wrote:
4)If i were to modify my program into the following :

#include<iostream>
using namespace std;
int main()
{
char letter='A',count='0';

while(count<='26')
{
cout<<letter;
letter++;
count++;
}

return 0;
}<="" blockquote="">

Typing nearly random statements inside the IDE maybe amusing, I guess...

I strongly suggest you read a good C/C++ tutorial.

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]

UKM_Student15-Sep-09 0:13

15-Sep-09 0:13

What do u mean by IDE?

And regarding part 3, when i put count='1',the whole compiler runs it and gets stuck O_O,need to restart :X

CPallini15-Sep-09 0:26

15-Sep-09 0:26

UKM_Student wrote:
What do u mean by IDE?

The same thing quite a lot of people mean too, I suppose [^].
(Should I say 'editor'?)

UKM_Student wrote:
And regarding part 3, when i put count='1',the whole compiler runs it and gets stuck O_O,need to restart :X

The compiler runs and compiles the program. At the end you've an executable that, in turn, runs badly (make you restarting the computer). When a program hangs a system, it is, of course running, and producing (pretty noticeable) output.
Smile | :)

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]

UKM_Student15-Sep-09 0:32

15-Sep-09 0:32

Ok,thanks for your help. Smile | :)

David Crow15-Sep-09 2:47

15-Sep-09 2:47

UKM_Student wrote:
The program i wrote...

Really?

UKM_Student wrote:
1) The part where i bold-ed, why is there a need to put in the sign '...'?

What sign?

"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

UKM_Student15-Sep-09 6:05

15-Sep-09 6:05

What do u mean by really? Blush | :O

I remembered asking that question before and someone helped me out in editing my "wrong" program but i forgot to ask why he needed to put that '...' sign, but anyway, through trial and error i managed to produce the following :

#include<iostream>
#include<string>
using namespace std;
int main()
{
char letter='A',count=1;

while(count<=26)
{
cout<<letter;
letter++;
count++;
}
return 0;
}

David Crow15-Sep-09 6:19

15-Sep-09 6:19

UKM_Student wrote:
What do u mean by really?

I remembered asking that question before and someone helped me out in editing my "wrong" program...

It came from here.

UKM_Student wrote:
i forgot to ask why he needed to put that '...' sign,

What is a '...' sign? Elipses are often used with code snippets to show missing, irrelevant code. How do they pertain to this thread?

UKM_Student wrote:
...through trial and error i managed to produce the following :

#include<iostream>
#include<string>
using namespace std;
int main()
{
char letter='A',count=1;

while(count<=26)
{
cout<<letter;
letter++;
count++;
}
return 0;
}<="" blockquote="">

What trial and error? The code I gave you worked fine. Why the introduction of count?

"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

UKM_Student15-Sep-09 8:27

15-Sep-09 8:27

Ah so u were the person that helped me out the other day :P

The sign i was talking about isn't the '...',but rather the ' ' sign,ie, why should we put char='A' and not char=A.But palin helped in answering this part earlier already xD

Re:Trial and error part, my tutor said the program was too short, and moreover someone else in my class also used the same program so i tried introducing the count char and after a few tries, i managed to get the answer. :P

David Crow15-Sep-09 10:42

15-Sep-09 10:42

UKM_Student wrote:
The sign i was talking about isn't the '...',but rather the ' ' sign...

That's called a character constant.

UKM_Student wrote:
Re:Trial and error part, my tutor said the program was too short...

Too short for what? Why add code just for the sake of adding it? Roll eyes | :rolleyes:

A different approach on it might have looked like:

for (char Letter1 = 'A'; Letter1 <= 'Z'; Letter1++)
    cout << Letter1 << endl;

UKM_Student15-Sep-09 16:04

15-Sep-09 16:04

Lol, 'coz if i were to have the same program with one of my classmates,the lecturer might think that we copied each other so.... yeah Big Grin | :-D

David Crow15-Sep-09 16:59

15-Sep-09 16:59

True, technically, but the odds of that happening with a five line program are slim at best. Now if you turned in 100 lines of identical code, then you'd have issues.

UKM_Student21-Oct-09 21:57

RichEdit20WPT / Outlook Style Receipient Control

21-Oct-09 21:57

Hah ok, thanks for your help.

Steve Thresher14-Sep-09 23:38

Steve Thresher

14-Sep-09 23:38

I'd like to implement a control that will be used to build up a list of recipients for an email. It will ideally behave in a similar manner to Outlook 2007 (as that's the product we sell as an email client).

The window class for the Outlook 2007 control is a RichEdit20WPT but that doesn't seem to match any of the rich edit class names in the SDK headers. Can anyone tell me if this is a standard control or not?

Do any of the standard rich edit controls provide the necessary features to get a control to behave like the Outlook 2007 controls?

AxisFirst For Business

Re: RichEdit20WPT / Outlook Style Receipient Control

Randor 15-Sep-09 8:29

Randor

15-Sep-09 8:29

Hi Steve,

I dont see anything about RichEdit20WPT in the MSDN about Rich Edit Controls[^]. If the naming convention is any clue then it is most likely an extended RichEdit20W control used exclusively in Microsoft Office.

Best Wishes,
-David Delaune

SYSTEMTIME

VVVimal14-Sep-09 23:37

VVVimal

14-Sep-09 23:37

Hi
Can anyone tell how to compare systemtime.
SYSTEMTIME t1;
SYSTEMTIME t2;
GetSystemTime(&t1);
GetSystemTime(&t2);

Is this a good approach
t1==t2

Thanks

Re: SYSTEMTIME

CPallini14-Sep-09 23:49

14-Sep-09 23:49

VVVimal wrote:
Is this a good approach
t1==t2

Depends on your needs (i.e. be specific!).
Smile | :)

Re: SYSTEMTIME

Randor 15-Sep-09 1:36

Randor

15-Sep-09 1:36

VVVimal wrote:
Is this a good approach

No, that will not even compile. I would recommend converting to FILETIME structure with the SystemTimeToFileTime Function[^] and then to ULARGE_INTEGER Union[^] and compare the QuadPart.

Best Wishes,
-David Delaune

Showing Error [modified]

Game-point14-Sep-09 22:42

Game-point

14-Sep-09 22:42

    CImage image;
image.Load (_T(read.tif"));
   //x1 = 8108, y1 =68 , x2 = 8116,y2 = 82
CRect rect(x1,y1,x2,y2);
CDC *pDC=CDC::FromHandle(image.GetDC());
pDC->Draw3dRect(rect,RGB(255, 0, 0), RGB(0, 255, 0));
image.Save(_T("D:/2009ga.jpg"));

when i try to draw the rectangle in image ...
showing error msg like Expression : m_hDC == 0..but not drwing the rectangle in image..why Confused | :confused:

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

modified on Tuesday, September 15, 2009 4:49 AM

Re: Showing Error

CPallini14-Sep-09 22:59

14-Sep-09 22:59

Why don't you have a look at the SimpleImage [^] sample code?
Alternatively: why don't you use a debugger?
Smile | :)

Re: Showing Error

Game-point14-Sep-09 23:20

Game-point

14-Sep-09 23:20

thanks ..i hope it ll help me ...

how to debugger in Visual studio ..already i am working in C# .net ....i think its same procedure ...?

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

Re: Showing Error

CPallini14-Sep-09 23:43