Post your C/C++ Programs Here

[Sykora]

The only way is to create a new list, going through each node of the previous list and inserting it at the beginning of the new list.

eg :

Node *p = head->next;
Node *revHead = head;
head = head->next;
revHead->next = NULL;
while (p != NULL) {
    p = p->next;
    head->next = revHead;
    revHead = head;
    head = p;
}

Now you have a new list, with revHead as the head node.

[nithinks]

Originally Posted by Sykora

The only way is to create a new list, going through each node of the previous list and inserting it at the beginning of the new list.

eg :

Node *p = head->next;
Node *revHead = head;
head = head->next;
revHead->next = NULL;
while (p != NULL) {
    p = p->next;
    head->next = revHead;
    revHead = head;
    head = p;
}

Now you have a new list, with revHead as the head node.

Fine.. but lets assume that list contains some 1 lack records.. so if thats the case this program will create an overhead... any optimistic code?

[Sykora]

How does it create overhead? It isn't creating new nodes, just reinserting them in a new list.

[nithinks]

Originally Posted by Sykora

How does it create overhead? It isn't creating new nodes, just reinserting them in a new list.

You are right.. but is it not possible to do that without creating another list?

[Nav11aug]

try this..

node *revList(node *head)
{	
	if(head==NULL)
		return head;
		
	node *p,*q,*r;
	p=head;		

	while(p!=NULL){
		r=q=p->next;
		if(q!=NULL){
			q->next=p;
			p=r;
		}		
	}
	
	head=p;
	
	return head;	
}

[Glen Apayart]

My brother always use my admin account because i leave my pc on sometimes when im away or sleeping for a while.

So, I made a simple conditional statement for my brother to be reminded about the account he is using. By changing the icons of my .exe from his favorite game icon. hehe

#include <iostream>
using namespace std;

int main()
{
    char Ans;

    cout << "Hello!\n";
    cout << "The program you have choosen has been disabled by the admin,\n";
    cout << "Please use your own account,\n\n";

    do{
    cout << "do you want to exit (y/n)? ";
    cin >> Ans;

        if(Ans == 'n' || Ans =='N')
            cout << "Could you please leave me now...\n\n";
        else if(Ans == 'y' || Ans == 'Y')
            break;
        else
            cout << "Invalid Entry!\n\n";
    }
    while(Ans != 'y' || Ans != 'Y');
        system("cls");
        cout << "Thank you!" << "\n\n";
        cout << "Press any key to exit...";

    return 0;
}

[aditya.shevade]

^^ ROFL

By the way, I am working on a Library Emulation project. For my submissions. A mini project. The problem is that everyone has to do this one only (Library) and our mam wants 80 different source codes. (I am sure mine will be unique ).

It does not use file handling. I will post it here soon.....

Aditya

PS @ Glen Apayart, I just saw you signature... You are a newbie you say, but still. There is no void main in ISO C/C++

[BBThumbHealer]

i m making my project for class xii...its heading its completion , last thing that i wanna do is like i m making a calendar and a billing dept. calculation center , i wanna print that on a paper using the printer ! is this possible ? if yes , then plz buddies help in coding !

[arunks]

Originally Posted by Glen Apayart

My brother always use my admin account because i leave my pc on sometimes when im away or sleeping for a while.

So, I made a simple conditional statement for my brother to be reminded about the account he is using. By changing the icons of my .exe from his favorite game icon. hehe

#include <iostream>
using namespace std;

int main()
{
    char Ans;

    cout << "Hello!\n";
    cout << "The program you have choosen has been disabled by the admin,\n";
    cout << "Please use your own account,\n\n";

    do{
    cout << "do you want to exit (y/n)? ";
    cin >> Ans;

        if(Ans == 'n' || Ans =='N')
            cout << "Could you please leave me now...\n\n";
        else if(Ans == 'y' || Ans == 'Y')
            break;
        else
            cout << "Invalid Entry!\n\n";
    }
    while(Ans != 'y' || Ans != 'Y');
        system("cls");
        cout << "Thank you!" << "\n\n";
        cout << "Press any key to exit...";

    return 0;
}

hey what does system("cls") do...?
is this a inbuilt function...? how and what is its usage..?
is this used to execute shell commands i mean dos commands..

[QwertyManiac]

Originally Posted by arunks

hey what does system("cls") do...?
is this a inbuilt function...? how and what is its usage..?
is this used to execute shell commands i mean dos commands..

Yeah it is used to execute commands, or launch other programs too perhaps.

Your current running program halts when this is called, and continues only after the command called completes execution. System() makes the code OS-Dependent.

http://www.phim.unibe.ch/comp_doc/c_...NS/system.html

[Gigacore]

what is typedef

[QwertyManiac]

Typedef is commonly used to give any Data Type a new name.

Like for example:

#include<iostream>
int main()
{
    typedef int a;  // Thus, a refers automatically to an integer
    a abc=1, def=0; // Creates two variables of type int,
                              // as the typedef above shows
    cout<<"ABC = "<<abc<<" DEF = "<<def<<endl;
    return 0;
}

This is very useful while working with a lot of classes, or structures. You can name them comfortably or for different usages (Like we use Position and List names in a clear Linked List algorithm but both are essentially the same structure, just used with a different name to aide understanding).

[Gigacore]

thanks qwerty

[shyamno]

can anyone give me a tutorial on how to ....do user authentication using C..is it possible...

suppose I ..have created a website ...where a member have to login...so how do I check the user verification.....

Any source code...

[BBThumbHealer]

Originally Posted by BlackBerry7100g

i m making my project for class xii...its heading its completion , last thing that i wanna do is like i m making a calendar and a billing dept. calculation center , i wanna print that on a paper using the printer ! is this possible ? if yes , then plz buddies help in coding !

wud anyone lyk to help in the above case ?

[aditya.shevade]

I have been having a problem. And someone please help me as soon as you can.

I have designed a project to be submitted in the college for submission purpose. Now, the project is a library database. I have developed a little part and I am attaching it.

When I showed the program to our teacher, she said that I must use inheritance in the program. The problem is that I don't know much about it, and from whatever I read and tried to gather in the last 2 days, I have reached a conclusion that inheritance cannot be used effectively in this case.

So please please tell me where and how to use it. Else I will have to submit this one only.

Aditya

[QwertyManiac]

Sometimes in colleges, 'effective' isn't the word, its 'you have to'. So implementing it even for a basic thing would satisfy them. Just saying ..

I don't understand 'make' stuff in your files, you use Ajunta? Is coding them all into one file not a good procedure? And the use of header files etc? Wait, how do I even compile it? Need some enlightenment on this.

[aditya.shevade]

Originally Posted by QwertyManiac

Sometimes in colleges, 'effective' isn't the word, its 'you have to'. So implementing it even for a basic thing would satisfy them. Just saying ..

I don't understand 'make' stuff in your files, you use Ajunta? Is coding them all into one file not a good procedure? And the use of header files etc? Wait, how do I even compile it? Need some enlightenment on this.

I use anjuta. You guessed right. To compile it... I dunno the sommand line method. But if you have Anjuta, then create a new project and add the files in that project. Then click on auto generate the project.

Then compile, make and build to execute.

And after reading professional C++, I have reached the conclusion that creating different files is the best way to make the program easy to understand, modify and expand.

Try if you can, else I will send you the entire project by mail. The compressed (tar.bz2) file is about 1000KB.

Aditya

[[xubz]]

Has anyone correctly implimented Brent-Salamin algorithm for computing Pi? I never was able to get it right

(Only thing i've done is Leibniz method of Pi, thats easy, but it takes insane amount to just calculate 10 decimal places accurately! :-/)

[The_Devil_Himself]

^^lol me too.I am wondering how to compile it using Dev c++.
BTW you are very good at programming Aditya and a clean programmer.

[QwertyManiac]

Originally Posted by aditya.shevade

Try if you can, else I will send you the entire project by mail. The compressed (tar.bz2) file is about 1000KB.

That's okay, never mind, seems beyond my mind right now. Someone else like Yamaraj or Sykora might be able to answer it I s'pose. Am not that good really, yet

And a doubt:
Does Anjuta automatically create Header files or did you _HAVE_ to code them?

[aditya.shevade]

^^

[QwertyManiac]

Alright, am trying my best right now. (I sure am tired after this).

Hopefully would tell you a few ways to implement inheritance into it after going through entirely.

/Me does a sudo apt-get install anjuta

Edit: You need to document your files .. Comments make it easier

[aditya.shevade]

^^ Anjuta is very good.

And I need this by friday.

[vinit suri]

hey guys i needed ur help wid a c program.....

cud sm1 plzz post dis program 4 me...plzzzzz
d program is that....

it should accept any number between one and thousand and find the first non zero digit of the factorial of dat number from the right hand side.....


plz plz plz help me...

[mehulved]

Shouldn't that be easy.
1) Find the factorial
2) Divide it by 10
3) Check the remainder
4) If it's 0 discard it

[vinit suri]

d question is which datatype 2 use....
v are talkin abt d factorial of even 1000....
so ders no datatype which can store dat....finding factorial is impossible....

hey guys i needed ur help wid a c program.....

cud sm1 plzz post dis program 4 me...plzzzzz
d program is that....

it should accept any number between one and thousand and find the first non zero digit of the factorial of dat number from the right hand side.....


plz plz plz help me...
__________________

[The_Devil_Himself]

You can use exponential form i.e. aeb= a into e raised to the power b.Its limits is from -3.4e38 to 3.4e38.Hope this helps.I have never used it so don't ask how to implement it.

BTW your question looks like picked up from CAT or something.I'm sure of some trick involved.

[aditya.shevade]

^^ trick might be that, if you multiply by 1000 then the first non zero from right cannot be 1 to 3 as there will be three zeros already. Also, for 1000, you will have 990 so add one more zero, 980 another zero and so on.

It's not easy this way, but worth a try.

[aditya.shevade]

Originally Posted by QwertyManiac

Edit: You need to document your files .. Comments make it easier

Actually, even I thought I should but after a couple of my friends who are not very good at C/C++ also understood the code just be the names of the variables, I think I can save the trouble.

So, I just added a naming conventions file as a documentation, and forgot to add it in the zip archive.

Here it is by the way, if you would like.

Aditya