C / C++ / MFC Discussion Boards

Hi,
are there any libs to draw charts and diagrams, like in excel or in powerpoint??

I need to draw on my dialog some chart and diagrams, for that o like to check first if there are any available projects allready here for download??

Thanks for help
termal

There's Cédric magnifiche control, here at CP [^].
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]

Yes, use standard MS Chart control.
Never use external libs (Win32 api has all)

Hi,

I was asked the below in an interview:-

What does the following code below do?

<br />
char nextChar();<br />
<br />
int main()<br />
{ <br />
    char ch;<br />
    ch = nextChar() != '\0';<br />
    std::cout << (int) ch;<br />
 <br />
   return 0;<br />
}<br />

I said it would not compile since there is no definition (only a declaration) of the function nextChar() but the answer was 0 or 1. I am not sure why and also how can you use the != operator outside a if or while statement (i.e. something that expects true or false ?

Thank you for any input.

minkowski wrote:
nextChar() != '\0'

This part of the code actually "returns" something (true or false). You then assign the result of the comparison into the ch variable. true is usually 1 and false is 0. So, your character will contain either 0 or 1. If you try to ouptut as it is (so, without the casting to an integer), you will end up printing the character whose value is 0 or 1 (so, not printable character), that's why you need to cast it to an integer.

I guess that having a body for your function was not really important for the interview question: they simply have a function that returns a character...

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Hi ya,

Thanks for your reply. Yes as you correctly said the answer is 0 or 1. I got confused because of the lack of function definition.

Can I ask how it is possible that you can use the != operator without being enclosed in a statement that expects true / false ? e.g. while() , if()

Thanks for any information.

minkowski wrote:
Can I ask how it is possible that you can use the != operator without being enclosed in a statement that expects

!= is a binary operator that may be used in any expression.
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]

Yes you should get a linker error, due to the missing function definition

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Most interview questions just use code fragments, and you're supposed to assume functions exist in other libraries (that's generally spelled out in the interview).

Mind you, this is a very simple example question and probably meant as a warm up, not actually a real test. You should see the kinds of questions we ask in our interviews (although coding tests are only a small part of them).

There are three kinds of people in the world - those who can count and those who can't...

Hi ya,

Thanks for your post, was wondering if you could put up some of your interview code questions?

Smile | :)

LOL - I wouldn't be allowed to do that, just in case anyone reading here comes in for an interview (which is quite possible) Big Grin | :-D

There are three kinds of people in the world - those who can count and those who can't...

minkowski wrote:
I said it would not compile since there is no definition (only a declaration) of the function nextChar()

Your point is correct (please note, however, that you would get a linker error, not a compiler one).

Now suppose nextChar is defined, somewhere (it's actual implementation doesn't matter).

minkowski wrote:
but the answer was 0 or 1. I am not sure why and also how can you use the != operator outside a if or while statement (i.e. something that expects true or false ?

nextChar() != '\0';

the above expression evaluates true whenever nextChar return a value different from '\0', false otherwise. Since true is 1 [^] (false is 0) an implicit cast from bool to char (that is an integer type) happens and you get ch=1 (or ch=0).
Smile | :)

BTW Are you that Minkowski [^]? Big Grin | :-D

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]

CPallini wrote:
W Are you that Minkowski [^]?

or that one[^] ?!

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Ha ha, nope I am not that Minkowski although that was quite a story !

Smile | :)

I was awaiting for some geometry hints... Big Grin | :-D

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]

CPallini wrote:
I was awaiting for some geometry hints...

shhhh. dont' tell anyone, but i'm letting it leak out - a triangle... has 3 sides. shhh. don't let anyone know though

UserNameless wrote:
a triangle... has 3 sides.

That's the reason geometry is soooo difficult to grasp: triangle => three sides...while plain common sense would suggest triangle => three angles, or, at least, triside => three sides. Unsure | :~

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]

so it should be a quad - right - angle for a rectangle ?

Smile | :)

minkowski wrote:
ch = nextChar() != '\0';

This is what the question is aiming at.
It's a matter of operator precedence.

«_Superman_»
I love work. It gives me something to do between weekends.

[Message Deleted]

Dear Sir (or Madam), you're supposed to be a software developer.
Software developers are supposed to develop code.
At least developers are supposed to read forum guidelines [^] before posting here.
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]

[Message Deleted]

Sorry, today's is not the Lazy Developer Day... 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]

Hi..I have an regular expression "^[a-zA-Z0-9_]([^@ ]*)@[a-zA-Z0-9]{2,}((\\.[a-zA-Z0-9]{2,}))*$" for Email Validation in java.I want same to do in VC++ , is there ant way to do it...?

Plz help..!!!!

thanks in Advance.

It's not enough to be the best, when you have capability to be great....

have a look at Boost Regex

http://www.boost.org/doc/libs/1_39_0/libs/regex/doc/html/index.html[^]

(there are other libraries out there to do the same)

'g'