programming-examples/c++/Others/Hospital management database - Project Program for Hospital Database Queue array.cpp

Hospital management database - Project Program for Hospital Database Queue array.

Code :


#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>

// define maximum number of patients in a queue
#define MAXPATIENTS 100

// define structure for patient data
struct patient
{
   char FirstName[50];
   char LastName[50];
   char ID[20];
};


// define class for queue
class queue
{
   public:
   queue (void);
   int AddPatientAtEnd (patient p);
   int AddPatientAtBeginning (patient p);
   patient GetNextPatient (void);
   int RemoveDeadPatient (patient * p);
   void OutputList (void);
   char DepartmentName[50];
   private:
   int NumberOfPatients;
   patient List[MAXPATIENTS];
};


// declare member functions for queue

queue::queue ()
{
   // constructor
   NumberOfPatients = 0;
}


int queue::AddPatientAtEnd (patient p)
{
   // adds a normal patient to the end of the queue.
   // returns 1 if successful, 0 if queue is full.
  if (NumberOfPatients >= MAXPATIENTS)
   {
      // queue is full
      return 0;
   }
      // put in new patient
      else
      List[NumberOfPatients] = p;  NumberOfPatients++;
      return 1;
}


int queue::AddPatientAtBeginning (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 (NumberOfPatients >= MAXPATIENTS)
   {
      // queue is full
      return 0;
   }

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


int queue::RemoveDeadPatient (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<NumberOfPatients; 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
	 	NumberOfPatients--;
	 		for (j=i; j<NumberOfPatients; j++)
				{
	    				List[j] = List[j+1];
				}
		}
	}
   return found;
}


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

		for (i=0; i<NumberOfPatients; i++)
		{
			cout << "
" << List[i].FirstName;
	 		cout << " " << List[i].LastName;
	 		cout << " " << List[i].ID;
		}
	}
}


// declare functions used by main:

patient InputPatient (void)
{
   // this function asks user for patient data.
   patient p;
   cout << "

Please enter data for new patient
First name: ";
   cin.getline(p.FirstName, sizeof(p.FirstName));
   cout << "
Last name: ";
   cin.getline(p.LastName, sizeof(p.LastName));
   cout << "
Social security number: ";
   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 data:";
   cout << "

First name: " << p->FirstName;
   cout << "

Last name: " << p->LastName;
   cout << "

Social security number: " << p->ID;
}


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
      	   clrscr();
      	   // print menu
      	   cout << "


Welcome to department: " << q->DepartmentName;
      	   cout << "

Please enter your choice:";
      	   cout << "

1:  Add normal patient";
      	   cout << "
2:  Add critically ill patient";
      	   cout << "
3:  Take out patient for operation";
      	   cout << "
4:  Remove dead patient from queue";
      	   cout << "
5:  List queue";
      	   cout << "
6:  Change department or exit
";
      	   // get user choice
      	   choice = ReadNumber();
      		// do indicated action
      	switch (choice)
	  {
      		case 1:   // Add normal patient
	 	p = InputPatient();
	 	if (p.ID[0])
		   {
	    		success = q->AddPatientAtEnd(p);
	    		clrscr();
	    		  if (success)
			    {
	       			cout << "
Patient added:

";

			    }
	        else
		   {
	       		// error
	       		cout << "

Error: The queue is full. Cannot add patient:";
		   }
	    		OutputPatient(&p);
	    		cout << "

Press any key";
	    		getch();
	  }
	 break;

      case 2:   // Add critically ill patient
	 p = InputPatient();
	 if (p.ID[0])
	     {
	    	success = q->AddPatientAtBeginning(p);
	    	clrscr();
	    	  if (success)
			{
	       		  cout << "
Patient added:

";
	     		}
	 	  else
	     		{
	       		  // error
	       		  cout << "

Error: The queue is full. Cannot add 
patient:";
			}

			  OutputPatient(&p);
	    		  cout << "

Press any key";
	    		  getch();
	     }
	 break;

      case 3:   // Take out patient for operation
	 p = q->GetNextPatient();
	 clrscr();
	 if (p.ID[0])
	    {
	       cout << "
Patient to operate:

";
	       OutputPatient(&p);}
	 else
	    {
	       cout << "
There is no patient to operate.";
	    }
	       cout << "

Press any key";
	       getch();
	       break;

      case 4:   // Remove dead patient from queue
	 p = InputPatient();
	 if (p.ID[0])
	   {
	        success = q->RemoveDeadPatient(&p);
	        clrscr();
	          if (success)
		      {
	       		cout << "
Patient removed:

";
		      }
	    	  else
		      {
	       		// error
	       		cout << "

Error: Cannot find patient:

";
		      }
	   	OutputPatient(&p);
	    	cout << "

Press any key";
	    	getch();
	   }
	 break;

      case 5:   // List queue
	 clrscr();
	 q->OutputList();
	 cout << "

Press any key";
	 getch();  break;
	 }
      }
}


// main function defining queues and main menu
void main ()
{
   int i, MenuChoice = 0;
   // define three queues
   queue departments[3];
   // set department names
   strcpy (departments[0].DepartmentName, "Heart clinic");
   strcpy (departments[1].DepartmentName, "Lung clinic");
   strcpy (departments[2].DepartmentName, "Plastic surgery");

   while (MenuChoice != 4)
	{
      	   // clear screen
      	   clrscr();
      	   // print menu
      	   cout << "


Welcome to Software City Hospital";
      	   cout << "

Please enter your choice:
";
          for (i = 0; i < 3; i++)
		{
	 	   // write menu item for department i
	 	   cout << "
" << (i+1) << ":  " << departments[i].DepartmentName;
		}
      	  cout << "
4:  Exit
";
      	  // get user choice
      	  MenuChoice = ReadNumber();
      	  // is it a department name?
      		if (MenuChoice >= 1 && MenuChoice <= 3)
		    {
	 		// call submenu for department
	 		// (using pointer arithmetics here:)
	 		DepartmentMenu (departments + (MenuChoice-1));
		    }
	}
}