How to generate an auto ID (or Auto Number)

Hello,

This code is for (hospital management system).

This code allow you to add patients.

There are two types of patients. which is:
1. Normal patient.
2. Critically ill patient.

once you added any patient. You will be able to show all patient using "ShowAllPatient;" method. -> i want the Auto-increment ID Number to appear for each patient has been added.

And you will be able to call a patient to provide a hospital services for him/her using "GetNextPatient;" method.


I need to generate an Auto-increment Number for each (patient) has been added. (Auto-increment Number) but it just should be different for each patient. For example the first patient will have 1, The second patient will have 2. etc. The Auto-increment number should appear for each patient.

i really tired a lot but i could not find a solution.

[ Moved thread ]

Quote:

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Originally Posted by general07z

Hello,

This code is for (hospital management system).

This code allow you to add patients.

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Please, edit your post adding Code tags around your code snippets.
Otherwise your code is absolutely unreadable!

Quote:

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Originally Posted by VictorN

Please, edit your post adding Code tags around your code snippets.
Otherwise your code is absolutely unreadable!

---

Thanks, but i guess there are a lot of code tags around my code.
Not for each line, but almost for each line. enough to be understood.

Thanks again.

Quote:

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Originally Posted by general07z

Thanks, but [хл]i guess there are a lot of code tags around my code[/хл].
Not for each line, but almost for each line. enough to be understood.

---

Your "guess" is wrong! And I strongly recommend you first read the Announcement: Before you post.... and only then you may or may not "guess".

But if you don't care where someone will read your unformatted and absolutely unreadable code snippet then you can ignore my post. :cool:

We aren't talking about //comments, but phpBB [CODE][/CODE] tags

You put them around your code, and it looks readable:

This:
[CODE]#include <iostream>

int main()
{
std::cout << "Hello, world!\n";
}[/CODE]

Becomes:

Code:

---

#include <iostream>
 
int main()
{
  std::cout << "Hello, world!\n";
}

---

Alright, i have added [code][/ code] tags around my code.

hope my code is readable now.

There are generally two ways two ways to generate unique IDs:

1. Incremental generation: You have a static service you can query for an ID. This service will incrementally generate numbers, and will guarantee each entry is unique.
2. Unicity through scarcity: This is the UUID approach: The basic idea is that if you generate random 128 bit numbers, they id will be statistically unique.

On a side note, you may want to consider using actual C++ containers, instead of rolling out your own. You want to look at:

• vector
• queue
• priority_queue

Quote:

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Originally Posted by monarch_dodra

There are generally two ways two ways to generate unique IDs:

1. Incremental generation: You have a static service you can query for an ID. This service will incrementally generate numbers, and will guarantee each entry is unique.
2. Unicity through scarcity: This is the UUID approach: The basic idea is that if you generate random 128 bit numbers, they id will be statistically unique.

On a side note, you may want to consider using actual C++ containers, instead of rolling out your own. You want to look at:

• vector
• queue
• priority_queue

---

hey,

Thanks for your reply.

Now the problem is not of generating an ID, the problem is how can i specific the ID that has been generated for a patient, i mean how can i appear the number more than once for the same patient? and sometimes i will be having more than a patient. because the auto ID should be saved in the queue. so whenever i want to view all the patient, the same ID will appear for the right patient.

i got a lot of codes for generating an Number, but the problem is how to appear the same number that has been generated for the patient when i want call him/her.



for example this code:

unique ID for objects

Code:

---


class IDGenerator {
  public:
      static IDGenerator * instance ();
      uint32_t next () { return _id++; }
  private:
      IDGenerator () : _id(0) {}

      static IDGenerator * only_copy;
      uint32_t _id;
}

IDGenerator *
IDGenerator::instance () {
  if (!only_copy) {
      only_copy = new IDGenerator();
  }
  return only_copy;
}

---

and i will be able to get a unique ID at any time by doing:

Code:

---

IDGenerator::instance()->next ()

---

But i don't know how to apply it on my code.
any help? how to apply it on my code.

regards

Did you consider using a simple free database (like MS Access) to save your data? DB generates unique ID for you and assigns it to every new record in a table...

Isn't this a little simpler? No need to 'new' anything.

Code:

---

uint32_t NextID()
{
    static  uint32_t _id = 0;

    return _id++;
}

int main()
{
    uint32_t id = NextID();
}

---

Quote:

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Originally Posted by VictorN

Did you consider using a simple free database (like MS Access) to save your data? DB generates unique ID for you and assigns it to every new record in a table...

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No, im not using any database. just black screen

Thanks for your reply.

Quote:

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Originally Posted by JohnW@Wessex

Isn't this a little simpler? No need to 'new' anything.

Code:

---

uint32_t NextID()
{
    static  uint32_t _id = 0;

    return _id++;
}

int main()
{
    uint32_t id = NextID();
}

---

---

Yes. looks simpler. but how to apply it on my code?


looking forward for your assistance,
Thanks a lot

Quote:

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Originally Posted by VictorN

Did you consider using a simple free database (like MS Access) to save your data? DB generates unique ID for you and assigns it to every new record in a table...

---

The problem if i want to use a database, i have to change a lot of things and almost start over with my code.
But if there is a way to use the database to save only the Auto Numbers. That is will be great.

As the code is saving the new records in queue. but i'm able to view the records at any time. but the records will be removed once the program is closed or restart.
So no need to save the other records in the database, IF there is a way to save only the Auto ID in the database -> But i know that it will be heavy work and header to me to do it.



i really appreciate
Best regards

Quote:

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Originally Posted by general07z

But i don't know how to apply it on my code.
any help? how to apply it on my code.

regards

---

In your code, each patient has a first name, last name and an ID. Shouldn't the ID be used to identify each patient then? The only problem I see, is that your ID is a string now, whereas you want it to be a number.

Quote:

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Originally Posted by D_Drmmr

In your code, each patient has a first name, last name and an ID. Shouldn't the ID be used to identify each patient then? The only problem I see, is that your ID is a string now, whereas you want it to be a number.

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hey,


The ID in my code is defined as a "Phone Number", as showing here:

Code:

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cout << "Phone Number : " << List[i].ID<<endl<<endl;

---

You see here

Code:

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List[i].ID

---

So, We have to define another structure to the code for the auto ID, . For example "generated_ID;".

OR, since the "ID;" function is for the "Phone number", is it possible to change it for generating the Auto ID? it should be easier for us if we did that right ?



Regards

Quote:

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Originally Posted by general07z

The ID in my code is defined as a "Phone Number", as showing here:

---

If you want to store a phone number, then declare your variable as "Phone_Number"!

"as shown here": We can only read so much code to try to understand what you are doing. We can't read your mind.

Quote:

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Originally Posted by monarch_dodra

If you want to store a phone number, then declare your variable as "Phone_Number"!

"as shown here": We can only read so much code to try to understand what you are doing. We can't read your mind.

---

Yes that is true,
So i hope to change that variable to make it for generating an ID. i don't want any more "Phone number" Generating the Auto ID is more important than Phone number.

So now the program shouldn't ask for entering the ID, directly when the patient is successfully added the Auto ID should appear with the entered information.
for example:

First Name:
John

Last Name:
Jobs

ID:
001


Regards

So why not just go to the end of your queue, or what ever your container is, look up the last ID and add 1 to it?

Does this data need to be persistent between runs of the program?

Quote:

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Originally Posted by GCDEF

So why not just go to the end of your queue, or what ever your container is, look up the last ID and add 1 to it?

Does this data need to be persistent between runs of the program?

---

Hey,

How can i do that?
Is your idea, the number will be auto increase when i added another patient?
If yes, Please where do i have to change in my code.



I just need the ID to be increasing when i added another patient

like the first patient will have ID number 1
the second patient will have number 2.........


So i don't want the the program to ask me for Entering ID.
But when i add it. he should have the ID.




Thanks

Hey,

I have added

Code:

---



int main(){
        int Auto_ID =0;
}

---

than Added

Code:

---


cout<<"ID"<<p.Auto_ID++<<endl;

---

but it showing me an error

Code:

---

"see declaration of 'main'"

---

I just need the easiest way to make this ID works


Thanks

Quote:

---

Originally Posted by general07z

Hey,

I have added

Code:

---

int main(){
        [hl]int Auto_ID[/hl =0;
}

---

than Added

Code:

---

cout<<"ID"<<p.Auto_ID++<<endl;

---

but it showing me an error

Code:

---

"see declaration of 'main'"

---

---

And What is "p" in this context? :confused:

hey, it is a pointer

Code:

---

// define class for queue
class queue
{
  public:
  queue (void);
  int RegisterPatien (patient p);
  int RegisterPatientAtBeginning (patient p);
  patient GetNextPatient (void);
  int CancelAll (patient * p);
  void OutputList (void);
  char DepartmentName[50];
  private:
  int ShowAllPatient;
  patient List[MAXPATIENTS];
};

---

So what is the problem with:

Code:

---



int main(){
        int Auto_ID =0;
}

---

Is there any other method to do auto-increment number?

HI friends I'm actually new to C++..and wanted to know how to add a auto numbering code to my First ever program..guys would you mind helping me..how should this be coded?

What is "a auto numbering code"?
What is it supposed to do?

Well its suppose to increase the number..example: 1st Customer ID would be Cust001, 2nd Customer Id would be Cust002..

actually this is for a Bank and when a new member is added his/her Bank Number should be delivered automatically..example:

Account Number: 001 //this should be automatically generated

Name : J_Freak //the person has to type
Age : 21 //the person has to type

so on....

If it "or a Bank" then you should (maybe just must!) use some type of database. And a database will generate all these IDs for you for each new added account.

Well this is really really a basic "BASIC" programming..just a console application with 4 options (New account, Withdraw, Deposit & Balance inquiry) and some basic validations..so when the "New account" is selected the user must be able to fill the application..and the account number should be generated automatically..and the details will be saved in a notepad..

Account Number: 001 //this should be automatically generated
Name : J_Freak //the person has to type
Age : 21 //the person has to type

So..I actually need to know how to do this "auto numbering" thinggy...

Are you going to supply such a "a basic "BASIC" ... console application with 4 options" to some Bank?
As for "auto numbering" in a real application (not just a a basic "BASIC" one) - see my previous post.

Nah nah..just a basic program for my school project..:)

Your previous post? which one?

This Forum is not for kidding! :mad:
So, please choose: either

Quote:

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Originally Posted by J_Freak

Nah nah..just a basic program for my school project..:)

---

or

Quote:

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Originally Posted by J_Freak

actually this is for a Bank

---

Ahhh so sorry if I was not clear..its actually a project/assignment for school..and the assignment is about a bank..I've done everything else but couldn't figure out on how to do the "auto numbering" part..

Quote:

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Originally Posted by J_Freak

Ahhh so sorry if I was not clear..its actually a project/assignment for school..and the assignment is about a bank..I've done everything else but couldn't figure out on how to do the "auto numbering" part..

---

Well, didn't you read the whole thread from the very begin?

ha..thanx alot I've figured out the way...but now caught up with another mess..
all these details are suppose to be written to a "notepad" and this is the coding that I used for it

void write_account()
{
account ac;

ofstream outFile;
outFile.open("Customer.txt",ios::in|ios::binary|ios::app);

ac.new_account();
outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
outFile.close();
}

but I'm not getting the output properly..its like jumbled with unknown characters...

What's the issue here?

Quote:

---

Originally Posted by J_Freak

that I used for it

Code:

---

void write_account()
{
        account ac;

        ofstream outFile;
        outFile.open("Customer.txt",ios::in|ios::binary|ios::app);

        ac.new_account();
        outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
        outFile.close();
}

---

but I'm not getting the output properly..its like jumbled with unknown characters...

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P Lease, use Code tags. Otherwise your code is hard to read/understand.
What is account? And why do you cast account* to char*?