Hospital Patient Management System (C++)

This is a console-based Hospital Patient Management System implemented in C++.

It manages:

• Patient registration (admission)
• Room allocation (General / ICU)
• Tracking critical patients
• Discharge with automatic bill calculation
• Patient stay duration
• Persistent storage in a text file (hospital_records.txt)

The system uses a doubly linked list (DLL) to store patients in memory and saves/loads all data to/from a file.

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1. Features

🏥 Core Features

1. Add Patient

   • Assigns a unique Patient ID automatically.
   • Stores:
     • Name
     • Age
     • Gender
     • Disease
     • Critical status (priority: 1 = Critical, 0 = Normal)
   • Automatically sets:
     • Admission date & time (current system time)
     • Status = Admitted
   • Patient is inserted in the linked list:
     • Critical patients → near the head
     • Normal patients → near the tail

2. Discharge Patient

   • Marks the patient as discharged.
   • Stores discharge date & time.
   • Calculates:
     • Number of days stayed (based on admission & discharge timestamps)
     • Total bill = days * room charge
   • Room charge:
     • General Ward → ₹1000 per day
     • ICU → ₹5000 per day

3. Search Patient

   • Search by Patient ID.
   • Shows:
     • Personal details (name, age, gender, disease)
     • Priority (Critical / Normal)
     • Room & ward type
     • Admission & discharge time
     • Status (Admitted / Discharged)
     • Total bill (if discharged)

4. Display All Patients

   • Lists every patient in the system in current DLL order:
     • ID, Name, Age, Gender, Disease
     • Priority, Room No, Ward Type
     • Status

5. Room Allocation System

   • Automatically allocates rooms based on priority:
     • Normal patients → General Ward (rooms: 101, 102, 103, …)
     • Critical patients → ICU (rooms: 201, 202, 203, …)
   • Prevents:
     • Allocating rooms to discharged patients
     • Allocating again if room is already assigned

6. Track Critical Patients

   • Submenu:
     1. Show all critical patients
     2. Mark a patient as critical & move to head of DLL
     3. Remove critical status & move to tail of DLL
   • Demonstrates priority management using doubly linked list operations.

7. Patient Stay Duration

   • Shows approximate days stayed in hospital for a given patient:
     • Uses admission time and:
       • Discharge time, if already discharged
       • Current time, if still admitted

8. Bill Menu

   • Displays detailed bill for discharged patients:
     • Name, Ward Type, Room No
     • Admission & Discharge time
     • Days stayed
     • Room charge per day
     • Total bill

9. Data Persistence

   • All data is stored in hospital_records.txt.
   • On program start → loads data from file.
   • On updates → saves data to file.

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2. Data Structures & File Format

2.1 In-Memory Structure

Each patient is stored as a struct Patient node in a doubly linked list:

struct Patient {
    int id;
    string name;
    int age;
    string gender;
    string disease;
    int priority;        // 1 = critical, 0 = normal
    int roomNo;
    string wardType;     // "General", "ICU", or "NA"
    int status;          // 0 = admitted, 1 = discharged

    long long admissionEpoch;
    long long dischargeEpoch;
    string admissionDateTime;
    string dischargeDateTime;

    double totalBill;

    Patient* prev;
    Patient* next;
};