please solve my confussion

[HP]

Hi All
i have confussion regarding given problem
please help me out
4. What happens with the following program:
void main(){
myclass* pmc = new myclass;
pmc = 0;
delete pmc;}

5. What is the difference between the statements
short* p = new short(500);
And
short* p = new short[500];
6. How would you deallocate the memory for :
short* p = new short(500);
And
short* p = new short[500];

7. How is an array of 10 pointers to int allocated from heap

[HP]

is there no body who know these thing

[Zara]

On 24 Oct 2005 22:56:19 -0700, "HP" <hi********@red iffmail.com> wrote:

Hi All
i have confussion regarding given problem
please help me out
4. What happens with the following program:
void main(){
myclass* pmc = new myclass;
pmc = 0;
delete pmc;}

5. What is the difference between the statements
short* p = new short(500);
And
short* p = new short[500];
6. How would you deallocate the memory for :
short* p = new short(500);
And
short* p = new short[500];

7. How is an array of 10 pointers to int allocated from heap

I think this is homework. Try looking to agood C book, i.e.K&R, and
try to work the answers from it.

[Karl Heinz Buchegger]

HP wrote:

is there no body who know these thing

Yes, there is.
But honestly, the problem is:
In another thread you described what you need to do, what your
assignment asks for. Except of one or two things, these assignment
isn't difficult and I would expect a programmer to code 90% of it
with easy. On the other hand, this assignment is extremely difficult
for a non programmer and your questions show, that you need to learn
a lot of things before you can even think about calling yourself
in a programmer. SO i guess what most of us fear is simply: To write
this application for you.

Otherwise:
Get yourself a book and start studying the basics. Programming, especially
C++ programming isn't something you can learn in a day or 2. Reserve a few
month for learning the basics, before you can even think about takling
your assignment problem.

Good luck.

--
Karl Heinz Buchegger
kb******@gascad .at

[HP]

Hi Zara
Its not a hoework, i m realy confuse in my project work.
i m not able to get answer of this
please help me

[Karl Heinz Buchegger]

HP wrote:

Hi All
i have confussion regarding given problem
please help me out

4. What happens with the following program:
void main(){
myclass* pmc = new myclass;
pmc = 0;
delete pmc;}
you got a memory leak
(and btw: the return type of main is always int)

5. What is the difference between the statements
short* p = new short(500);
And
short* p = new short[500];

the first creates *one* int and intializes it with 500
the second creates an (unniitialzed) array of 500 int
6. How would you deallocate the memory for :
short* p = new short(500);
And
short* p = new short[500];
delete p;
delete [] p;

7. How is an array of 10 pointers to int allocated from heap

int** p = new int* [10];
Get a book on C++ and practice, practice, practice

BTW: if you need all of the above extensively, you are barking
up the wrong tree. Use std::vector, std::list, std::map or whatever
other container fits your bill. That's the C++ way to handle most
of the data structure problems in a program.

--
Karl Heinz Buchegger
kb******@gascad .at

[HP]

Thankx ZARA

[Stuart Golodetz]

"HP" <hi********@red iffmail.com> wrote in message
news:11******** **************@ o13g2000cwo.goo glegroups.com.. .

Hi All
i have confussion regarding given problem
please help me out
If this is your homework (as I strongly suspect), then you're losing out by
not doing it yourself because you probably still won't understand it
afterwards. But since I'm feeling kind...

Stu

P.S. Get a book! :) Take a look at
http://www.accu.org/bookreviews/publ...nner_s_c__.htm to
give you some ideas about what's worth getting.
4. What happens with the following program:
void main(){
myclass* pmc = new myclass;
pmc = 0;
delete pmc;}
It doesn't compile (main always returns int, and myclass isn't declared).
Were the program, on the other hand:

class myclass
{
// something useful here
};

int main()
{
myclass *pmc = new myclass;
pmc = 0;
delete pmc;
return 0; // (ok, you could leave this line out as it happens...)
}

Then it would cause a memory leak, because you allocate a myclass object on
the heap, overwrite the pointer to it (by setting it to 0) and then try and
delete 0, which is a no-op. The object you allocated on the heap is still in
existence, you just don't have a pointer to it any more.
5. What is the difference between the statements
short* p = new short(500);
And
short* p = new short[500];
The first one allocates a single short on the heap, with value 500, and
stores its address in p.
The second one allocates an array of 500 shorts on the heap, and stores the
address of the first element of the array in p.
6. How would you deallocate the memory for :
short* p = new short(500);
And
short* p = new short[500];
delete p; for the first one
delete [] p; for the second one
7. How is an array of 10 pointers to int allocated from heap

int **p = new int*[10];

[Mike Wahler]

"Zara" <no***********@ terra.es> wrote in message
news:5l******** *************** *********@4ax.c om...

On 24 Oct 2005 22:56:19 -0700, "HP" <hi********@red iffmail.com> wrote:

Hi All
i have confussion regarding given problem
please help me out
4. What happens with the following program:
void main(){
myclass* pmc = new myclass;
pmc = 0;
delete pmc;}

5. What is the difference between the statements
short* p = new short(500);
And
short* p = new short[500];
6. How would you deallocate the memory for :
short* p = new short(500);
And
short* p = new short[500];

7. How is an array of 10 pointers to int allocated from heap

I think this is homework. Try looking to agood C book, i.e.K&R, and
try to work the answers from it.

It seems that you might need a book or two as well. :-)
Why do you recommend a C book for learning C++?

-Mike

[int2str]

Stuart Golodetz wrote:

"HP" <hi********@red iffmail.com> wrote in message
If this is your homework (as I strongly suspect), then you're losing out by
not doing it yourself because you probably still won't understand it
afterwards. But since I'm feeling kind...

"When a slackard asks comp.lang.c++ to do their homework for them,
answering their question is the worst thing for them. Please don't do
it!"

http://www.parashift.com/c++-faq-lit...t.html#faq-5.3