C / C++ / MFC

User 21559721-Apr-06 0:31

User 215597

21-Apr-06 0:31

Did you hear it as one of the question when being interviewed?

S o h a i l K a d i w a l a

modified 21-Apr-21 21:01pm.

Nishad S21-Apr-06 0:36

21-Apr-06 0:36

Nice question Smile | :)

- NS -

Nishad S21-Apr-06 0:34

21-Apr-06 0:34

I tried to compile the below code get the error...

class a
{
    virtual a()
    {
    }
};

error C2633: 'a' : 'inline' is the only legal storage class for constructors

- NS -

David Crow21-Apr-06 3:03

David Crow

21-Apr-06 3:03

NS17 wrote:

error C2633: 'a' : 'inline' is the only legal storage class for constructors

Because the constructor cannot be virtual.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

The BootExecute Data Entry

David Crow21-Apr-06 2:55

David Crow

21-Apr-06 2:55

Rinu_Raj wrote:
Do any one know about Virtual Constructors ?

See here.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

rajeevktripathi20-Apr-06 23:49

rajeevktripathi

20-Apr-06 23:49

Hi All
I want to run my program while Booting the system by inserting the program name in the registry key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager

Here in BootExecute am giving value
autocheck autochk *copyTest

here copyTest is a batch file which consists of a single command
copy C:\Test1.txt D:\Test1.txt

but after restarting the system I donot see file copied.

Please tell me that how to run copyTest batch file while booting

Please reply.
Thanks

Re: The BootExecute Data Entry

David Crow21-Apr-06 3:05

David Crow

21-Apr-06 3:05

rajeevktripathi wrote:
I want to run my program while Booting the system by inserting the program name in the registry key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager

Why are you not putting it here:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

ABC Abstract base class

Krishnatv20-Apr-06 23:48

Krishnatv

20-Apr-06 23:48

hi friends in MICROSOFT interview i have faced a question why abstract base class is needed? with out any instantiation what is its use ?

I tried to answer for it like its for design perspective,what r the behaviours
(virtual functions)specified in the Abstractbase class can be elaborated in the derived classes...like that the main purpose is its used as interface....
like that ,But he is not satisfied with my answer.
So Any of u can make my answer value added ?

krishna

Cedric Moonen20-Apr-06 23:52

20-Apr-06 23:52

It is usefull for polymorphism to provide a uniform way to manage different objects. They all have the same 'interface' but provide different behavior which are coded it the derived classes.

Nishad S20-Apr-06 23:59

20-Apr-06 23:59

I doubt that, what is necessity of pure virtual functions?

- NS -

Cedric Moonen21-Apr-06 0:04

21-Apr-06 0:04

To force the redefinition in derived class. It is just to protect reusability of the code. It is used so that you (or other developers that will reuse your code) don't 'forget' to provide a definition of a function which is required.

Nishad S21-Apr-06 0:08

21-Apr-06 0:08

Yes... I understood. Thank you Smile | :)

- NS -

Krishnatv21-Apr-06 1:36

Krishnatv

21-Apr-06 1:36

hai, can u make more sense ?

User 21559721-Apr-06 0:36

User 215597

21-Apr-06 0:36

Some quick points
- Abstract Factory Design Pattern
- Code reusability
- Interface driven approach of programming
- Polymorphism

S o h a i l K a d i w a l a

modified 21-Apr-21 21:01pm.

Krishnatv21-Apr-06 1:38

Krishnatv

21-Apr-06 1:38

Code reusability:

how is it possible there is no code to reuse in Abstract base classes

Conversion from int to basic string

Roger Stoltz21-Apr-06 2:01

Roger Stoltz

21-Apr-06 2:01

Krishnatv wrote:
how is it possible there is no code to reuse in Abstract base classes

It's not the base class or its existing derivatives in this case that is being "reused".
It's the code that uses the existing derivatives, the calling code (client?).
At least in theory, in practice it depends on whether the design is good or bad.
The use of abstract factories could leave the calling code unchanged if implemented properly.

--
Rog

It's suppose to be hard, otherwise anybody could do it!

itkid20-Apr-06 23:32

itkid

20-Apr-06 23:32

Hi Friend,
Is there any API which convert int(int a) to basic string(string b)?
itoa can convert a(int) to char*(Char *c) and I can get b from c.However is there any other way?

Thanks
Smile | :)

Nishad S20-Apr-06 23:41

20-Apr-06 23:41

wsprintf(str,"%d",n) is another way Wink | ;)

- NS -

Cedric Moonen20-Apr-06 23:55

20-Apr-06 23:55

I think he was asking how to convert an integer into a std::string directly

itkid21-Apr-06 0:01

itkid

21-Apr-06 0:01

U r right!!

Nishad S21-Apr-06 0:03

21-Apr-06 0:03

Sorry I am not familar with that...

- NS -

Cedric Moonen21-Apr-06 0:10

21-Apr-06 0:10

Yes but that's not a direct conversion. He was asking for a direct conversion, without using a char array.
Something like Format in CString.
Unfortunately I don't know if this is possible.

toxcct21-Apr-06 0:13

toxcct

21-Apr-06 0:13

this is not possible, because basic_string is at first a template, so for whatever kind of type...