How to generate an auto ID (or Auto Number)

[general07z]

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 ID or the Auto Number to appear here also on the list.

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 ID for each (patient) has been added. (Random ID) or (Random number) or anything but it just should be different for each patient. Because if i want to call a patient. The Auto ID should appear for each patient.

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

The code in the next reply


Thanks for any help.

[general07z]

#include "stdafx.h"
#include<conio.h>
#include<string.h>
#include<stdlib.h>
#include<iostream>
using namespace std;


// The maximum number of patients in queue
#define MAXPATIENTS 30


// define structure for patient information
struct patient

{
   char FirstName[50];
   char LastName[50];
   char ID[20];
};


// 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];
};


// declare member functions for queue

queue::queue ()
{
   // Constructor
   ShowAllPatient = 0;
}


int queue::RegisterPatien (patient p)
{
   // To add a patient (normally) to the queue (to the end).
   // returns 1 if successful, 0 if queue is full.
  if (ShowAllPatient >= MAXPATIENTS)
   {
      // queue is full
      return 0;
   }
      // put in new patient
      else
      List[ShowAllPatient] = p;  ShowAllPatient++;
      return 1;
}


int queue::RegisterPatientAtBeginning (patient p)
{
   // adds a critically ill patient to the beginning of the queue.
   // returns 1 if successful, 0 if queue is full.
   int i;
   if (ShowAllPatient >= MAXPATIENTS)
   {
      // queue is full
      return 0;
   }

   // move all patients one position back in queue
   for (i = ShowAllPatient-1; i >= 0; i--)
   {
      List[i+1] = List[i];
   }
   // put in new patient
   List[0] = p;  ShowAllPatient++;
   return 1;
}


patient queue::GetNextPatient (void)
{
   // gets the patient that is first in the queue.
   // returns patient with no ID if queue is empty

   int i;  patient p;
   if (ShowAllPatient == 0) {
   // queue is empty
   strcpy(p.ID,"");
   return p;}
   // get first patient
   p = List[0];
   // move all remaining patients one position forward in queue
   ShowAllPatient--;
   for (i=0; i<ShowAllPatient; i++)
   {
      List[i] = List[i+1];
   }
   // return patient
   return p;
}


int queue::CancelAll (patient * p)

{
   // removes a patient from queue.
   // returns 1 if successful, 0 if patient not found
   int i, j, found = 0;
   // search for patient
   for (i=0; i<ShowAllPatient; i++)
	{
      		if (stricmp(List[i].ID, p->ID) == 0)
		{
	 	// patient found in queue
	 	*p = List[i];  found = 1;
	 	// move all following patients one position forward in queue
	 	ShowAllPatient--;
	 		for (j=i; j<ShowAllPatient; j++)
				{
	    				List[j] = List[j+1];
				}
		}
	}
   return found;
}


void queue::OutputList (void)
{
   // lists entire queue on screen
   int i;
   if (ShowAllPatient == 0)
	{
      		cout<< "Queue is empty";
	}
   else
	{

		for (i=0; i<ShowAllPatient; i++)
		{
			cout << "First Name : " << List[i].FirstName<<endl;
	 		cout << "Last Name : " << List[i].LastName<<endl;
	 		cout << "Phone Number : " << List[i].ID<<endl<<endl;
		}
	}
}


// declare functions used by main:

patient InputPatient (void)

{
   // this function asks user for patient data.
   patient p;
   cout<<endl<<endl;
   cout << "Please enter the information of the Patient"<<endl<<endl;
   cout << "First name: "<<endl<<endl;
   cin.getline(p.FirstName, sizeof(p.FirstName));
   cout << "Last name: "<<endl<<endl;
   cin.getline(p.LastName, sizeof(p.LastName));
   cout << "Phone Number: "<<endl<<endl;
   cin.getline(p.ID, sizeof(p.ID));
   // check if data valid
   if (p.FirstName[0]==0 || p.LastName[0]==0 || p.ID[0]==0)
	{
      		// rejected
      		strcpy(p.ID,"");
      		cout << "Error: Data not valid. Operation cancelled.";
      		getch();
	}
   return p;
}


void OutputPatient (patient * p)
{
   // this function outputs patient data to the screen
   if (p == NULL || p->ID[0]==0)
	{
      		cout << "No patient";
      		return;
	}
   else
   cout << "Patient Information:"<<endl<<endl;
   cout << "First name: " << p->FirstName<<endl<<endl;
   cout << "Last name: " << p->LastName<<endl<<endl;
   cout << "Phone Number: " << p->ID<<endl<<endl;
}


int ReadNumber()
{
   // this function reads an integer number from the keyboard.
   // it is used because input with cin >> doesn't work properly!
   char buffer[20];
   cin.getline(buffer, sizeof(buffer));
   return atoi(buffer);
}


void DepartmentMenu (queue * q)
{
   // this function defines the user interface with menu for one department
   int choice = 0, success;  patient p;
   while (choice != 6)
	{
      	   // clear screen
// print menu
		   system("CLS");
      	   cout << "<< || Welcome || >> "<<endl << q->DepartmentName<<endl;
		   cout << "Please enter your choice:"<<endl<<endl;
      	   cout << "1:  Add patient"<<endl;
      	   cout << "2:  Add critically ill patient"<<endl;
      	   cout << "3:  Call a patient for operation"<<endl;
      	   cout << "4:  Remove all patients from queue"<<endl;
      	   cout << "5:  Show all patient"<<endl;
		   cout << "6:  Exit"<<endl<<endl<<endl<<endl<<endl<<endl<<endl<<endl;
      	   // get user choice
      	   choice = ReadNumber();
      		// do indicated action
      	switch (choice)
	  {
      		case 1:   // Add normal patient
	 	p = InputPatient();
	 	if (p.ID[0])
		   {
	    		success = q->RegisterPatien(p);
				system("CLS");
				if (success)
			    {
	       			cout << "Patient added:"<<endl<<endl;

			    }
	        else
		   {
	       		// error
	       		cout << "Sorry: The queue is full. We Cannot add any patient:";
		   }
	    		OutputPatient(&p);
	    		cout << "Press any key";
	    		getch();
	  }
	 break;

      case 2:   // Add critically ill patient
	 p = InputPatient();
	 if (p.ID[0])
	     {
	    	success = q->RegisterPatientAtBeginning(p);
			system("CLS");

			if (success)
			{
	       		  cout << "Patient added:";
	     		}
	 	  else
	     		{
	       		  // error
	       		  cout << "Sorry: The queue is full. We Cannot add any patient:";
			}

			  OutputPatient(&p);
	    		  cout << "Press any key to contiune";
	    		  getch();
	     }
	 break;

      case 3:   // Call patient for operation /First Come First Surve
	 p = q->GetNextPatient();
	 system("CLS");
	 if (p.ID[0])
	    {
	       cout << "Patient to operate:";
	       OutputPatient(&p);
	 }
	 else
	    {
	       cout << "Currently there is no patient to operate.";
	 }
	       cout << "Press any key to contiune";
	       getch();
	       break;

      case 4:   // Remove a patient from queue
	 p = InputPatient();
	 if (p.ID[0])
	   {
	        success = q->CancelAll(&p);
			system("CLS");			
			if (success)
		      {
	       		cout << "Patient removed:";
		      }
	    	  else
		      {
	       		// error
	       		cout << "Sorrt: We cannot find patient:";
		      }
	   	OutputPatient(&p);
	    	cout << "Press any key to contiune";
	    	getch();
	   }
	 break;

      case 5:   // Show all patient -> queues
		  system("CLS");
		  q->OutputList();
	 cout << "Press any key";
	 getch();  break;
	 }
      }
}


// the main function defining queues and main menu
void main ()
{
   int i, MenuChoice = 0;
   // define  queue
   queue department[1];
   // set department name
   strcpy (department[0].DepartmentName, "To Emergency Department");

   while (MenuChoice != 2)
	{
		system("CLS");

// Cout menu
      	   cout << "Welcome to Emergency Department (ED)"<<endl;
		   cout << "Plrase Enter a Number from the follwing manu:"<<endl<<endl;
          for (i = 0; i < 1; i++)
		{
	 	   // write menu item for department i
	 	   cout<< "" << (i+1) << ":  "<< department[i].DepartmentName;
		   cout<<endl;
		  }
      	  cout << "2:  Exit"<<endl;
      	  // get user choice
      	  MenuChoice = ReadNumber();
      	  // is it a department name?
      		if (MenuChoice >= 1 && MenuChoice <= 1)
		    {
	 		// call submenu for department
	 		// (using pointer arithmetics here:)
	 		DepartmentMenu (department + (MenuChoice-1));
		    }
	}
}