Programming Forums > Application Development > C

joeserhal · Mar 22nd, 2008, 1:35 AM

Hi there,
I'm facing some trouble with creating and naming queues in C language.
I need to create five queues using a "for" loop, and with each iteration of the "for" loop, a created queue will be given a name depending on the index of the iteration. It should look like something like this:

(Toggle Plain Text)

for(i=0;i<5;i++)
{
q(i) = CreateQueue(size 2);
}

At the first iteration, I should get a queue called q0 or something, then q1....

I need this because, at a later stage in my program, i need to access,through a "for" loop, a particular queue depending on the index of the iteration.

Does anybody know how i can do this??....
Thanks

Ooble · Mar 22nd, 2008, 1:51 AM

Are you creating the queue entirely yourself or can you use one that's been built for you?

If you're allowed to use a built-in library, try the queue class of the standard library. As you'll need five, make an array of five of them.

(Toggle Plain Text)

std::queue<queue type> q[5];

That should be all you need to create them. Obviously, you'll need to replace "queue type" with whatever type of variable you're storing in it. You can then use the push and pop methods to store and remove information. In addition, front will return the frontmost item in the queue.

joeserhal · Mar 22nd, 2008, 2:01 AM

Quote:

Originally Posted by Ooble

Are you creating the queue entirely yourself or can you use one that's been built for you?

If you're allowed to use a built-in library, try the queue class of the standard library. As you'll need five, make an array of five of them.

(Toggle Plain Text)

std::queue<queue type> q[5];

That should be all you need to create them. Obviously, you'll need to replace "queue type" with whatever type of variable you're storing in it. You can then use the push and pop methods to store and remove information. In addition, front will return the frontmost item in the queue.

Well, I'm using the queue.c and queue.h files, which contain the basic functions regarding queues (create, destroy, enqueue, dequeue, IsEmpty...)
So do you mean I should do smthg as:

(Toggle Plain Text)

#include <stdio.h>
#include <queue.h>

int main
{
   Queue q[5];//where Queue is the abstract datatype that corresponds to queues
   int i;
   for(i=0;i<5;i++)
     q[i]= CreateQueue(2);   //queue size = 2
   ....
   return 0;
}

??

lectricpharaoh · Mar 22nd, 2008, 4:04 AM

You've got the idea. Disregard Ooble's post, as it's for C++ rather than C (unless you posted this in the wrong forum, and meant to post in the C++ forum). I'm assuming this is for school, and your instructor has given you the queue ADT, or you got them from the textbook.

You will need to create an array of queues, and then initialize each element of the array. Now, depending how your queue type is implemented, you may need to allocate an array of pointers instead, but I doubt it. Can you post the contents of your queue.c and queue.h files?

Jessehk · Mar 22nd, 2008, 9:57 AM

Quote:

Originally Posted by lectricpharaoh

Disregard Ooble's post

It's been a tough week for Ooble on PFO.

joeserhal · Mar 22nd, 2008, 12:26 PM

Yup, I've attached them...To tell you the truth, I don't know how I didn't think about using an array for creating the qeues, I think I was so focused on naming the queues individually (q0, q1, q2....) that I forgot I could just easily store them in one array and then reference them using a particular index....

Ooble · Mar 23rd, 2008, 3:15 AM

Goddamnit, should pay more attention to the forum title. Sorry about that. It seems to have helped a bit though, so not all is lost.

The same logic I used in my previous post applies. Enqueue will push ints (typedef'd to ElementType, but you don't really need to worry about that) to the queue specified, [icode]Dequeue will pull the frontmost element off the queue and return it. You also have two handy functions, IsEmpty and IsFull, which basically do what they say on the tin.

It's important to note that you need to use the DestroyQueue function on each queue after you've finished to free up the memory properly.

joeserhal · Mar 23rd, 2008, 9:26 AM

Thanks for the info guys!!

rhish.franks · Mar 24th, 2008, 2:57 PM

You can use two dimensional array for that purpose, for using queue, one index for each entry of particular queue will remain constant! i.e. either row or column will remain constant for particular queue!

Mar 22nd, 2008, 1:35 AM	#1
joeserhal Newbie Join Date: Feb 2008 Posts: 12 Rep Power: 0	How to name queues using a "for" loop?? Hi there, I'm facing some trouble with creating and naming queues in C language. I need to create five queues using a "for" loop, and with each iteration of the "for" loop, a created queue will be given a name depending on the index of the iteration. It should look like something like this: (Toggle Plain Text) for(i=0;i<5;i++) { q(i) = CreateQueue(size 2); } for(i=0;i<5;i++) { q(i) = CreateQueue(size 2); } At the first iteration, I should get a queue called q0 or something, then q1.... I need this because, at a later stage in my program, i need to access,through a "for" loop, a particular queue depending on the index of the iteration. Does anybody know how i can do this??.... Thanks

Mar 22nd, 2008, 1:51 AM	#2
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Re: How to name queues using a "for" loop?? Are you creating the queue entirely yourself or can you use one that's been built for you? If you're allowed to use a built-in library, try the `queue` class of the standard library. As you'll need five, make an array of five of them. (Toggle Plain Text) std::queue<queue type> q[5]; std::queue<queue type> q[5]; That should be all you need to create them. Obviously, you'll need to replace "queue type" with whatever type of variable you're storing in it. You can then use the `push` and `pop` methods to store and remove information. In addition, `front` will return the frontmost item in the queue. __________________ Me :: You :: Them

Mar 22nd, 2008, 4:04 AM	#4
lectricpharaoh Caffeinated Neural Net Join Date: Jun 2005 Location: Dry west coast of Canada Posts: 922 Rep Power: 4	Re: How to name queues using a "for" loop?? You've got the idea. Disregard Ooble's post, as it's for C++ rather than C (unless you posted this in the wrong forum, and meant to post in the C++ forum). I'm assuming this is for school, and your instructor has given you the queue ADT, or you got them from the textbook. You will need to create an array of queues, and then initialize each element of the array. Now, depending how your queue type is implemented, you may need to allocate an array of pointers instead, but I doubt it. Can you post the contents of your `queue.c` and `queue.h` files? __________________ A man's knowledge is like an expanding sphere, the surface corresponding to the boundary between the known and the unknown. As the sphere grows, so does its surface; the more a man learns, the more he realizes how much he does not know. Hence, the most ignorant man thinks he knows it all. - L. Sprague de Camp

Mar 23rd, 2008, 3:15 AM	#7
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Re: How to name queues using a "for" loop?? Goddamnit, should pay more attention to the forum title. Sorry about that. It seems to have helped a bit though, so not all is lost. The same logic I used in my previous post applies. `Enqueue` will push `int`s (typedef'd to `ElementType`, but you don't really need to worry about that) to the queue specified, [icode]Dequeue will pull the frontmost element off the queue and return it. You also have two handy functions, `IsEmpty` and `IsFull`, which basically do what they say on the tin. It's important to note that you need to use the `DestroyQueue` function on each queue after you've finished to free up the memory properly. __________________ Me :: You :: Them

Mar 23rd, 2008, 9:26 AM	#8
joeserhal Newbie Join Date: Feb 2008 Posts: 12 Rep Power: 0	Re: How to name queues using a "for" loop?? Thanks for the info guys!!

Mar 24th, 2008, 2:57 PM	#9
rhish.franks Programmer Join Date: Feb 2008 Posts: 32 Rep Power: 0	Re: How to name queues using a "for" loop?? You can use two dimensional array for that purpose, for using queue, one index for each entry of particular queue will remain constant! i.e. either row or column will remain constant for particular queue!

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Programming Forums > Application Development > C

How to name queues using a "for" loop??