task2.cpp

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <iomanip>

using namespace std;

struct Employee {
    int id;
    string name;
    string department;
    double basicSalary;
    double allowance;
    double deduction;
};

vector<Employee> employees;

// Save employee data
void saveEmployees() {
    ofstream file("employees.dat");

    for (const Employee &emp : employees) {
        file << emp.id << '\n';
        file << emp.name << '\n';
        file << emp.department << '\n';
        file << emp.basicSalary << '\n';
        file << emp.allowance << '\n';
        file << emp.deduction << '\n';
    }

    file.close();
}

// Load employee data
void loadEmployees() {
    ifstream file("employees.dat");

    if (!file) {
        return;
    }

    Employee emp;

    while (file >> emp.id) {
        file.ignore();

        getline(file, emp.name);
        getline(file, emp.department);

        file >> emp.basicSalary;
        file >> emp.allowance;
        file >> emp.deduction;

        employees.push_back(emp);
    }

    file.close();
}

// Calculate net salary
double calculateNetSalary(const Employee &emp) {
    return emp.basicSalary + emp.allowance - emp.deduction;
}

// Add employee
void addEmployee() {
    Employee emp;

    cout << "\nEnter Employee ID: ";
    cin >> emp.id;

    // Check duplicate ID
    for (const Employee &e : employees) {
        if (e.id == emp.id) {
            cout << "Employee ID already exists!\n";
            return;
        }
    }

    cin.ignore();

    cout << "Enter Employee Name: ";
    getline(cin, emp.name);

    cout << "Enter Department: ";
    getline(cin, emp.department);

    cout << "Enter Basic Salary: ";
    cin >> emp.basicSalary;

    cout << "Enter Allowance: ";
    cin >> emp.allowance;

    cout << "Enter Deduction: ";
    cin >> emp.deduction;

    employees.push_back(emp);

    saveEmployees();

    cout << "\nEmployee added successfully!\n";
}

// Display employees
void displayEmployees() {
    if (employees.empty()) {
        cout << "\nNo employee records found.\n";
        return;
    }

    cout << "\n========== EMPLOYEE PAYROLL ==========\n";

    cout << fixed << setprecision(2);

    for (const Employee &emp : employees) {

        double netSalary = calculateNetSalary(emp);

        cout << "\nEmployee ID     : " << emp.id;
        cout << "\nName            : " << emp.name;
        cout << "\nDepartment      : " << emp.department;
        cout << "\nBasic Salary    : Rs. " << emp.basicSalary;
        cout << "\nAllowance       : Rs. " << emp.allowance;
        cout << "\nDeduction       : Rs. " << emp.deduction;
        cout << "\nNet Salary      : Rs. " << netSalary;

        cout << "\n--------------------------------------\n";
    }
}

// Search employee
void searchEmployee() {
    int id;

    cout << "\nEnter Employee ID: ";
    cin >> id;

    for (const Employee &emp : employees) {

        if (emp.id == id) {

            double netSalary = calculateNetSalary(emp);

            cout << fixed << setprecision(2);

            cout << "\nEmployee Found!\n";
            cout << "Employee ID  : " << emp.id << '\n';
            cout << "Name         : " << emp.name << '\n';
            cout << "Department   : " << emp.department << '\n';
            cout << "Basic Salary : Rs. " << emp.basicSalary << '\n';
            cout << "Allowance    : Rs. " << emp.allowance << '\n';
            cout << "Deduction    : Rs. " << emp.deduction << '\n';
            cout << "Net Salary   : Rs. " << netSalary << '\n';

            return;
        }
    }

    cout << "\nEmployee not found!\n";
}

// Delete employee
void deleteEmployee() {
    int id;

    cout << "\nEnter Employee ID to delete: ";
    cin >> id;

    for (auto it = employees.begin(); it != employees.end(); ++it) {

        if (it->id == id) {

            employees.erase(it);
            saveEmployees();

            cout << "\nEmployee deleted successfully!\n";
            return;
        }
    }

    cout << "\nEmployee not found!\n";
}

// Salary summary
void salarySummary() {

    if (employees.empty()) {
        cout << "\nNo employee records available.\n";
        return;
    }

    double totalSalary = 0;

    for (const Employee &emp : employees) {
        totalSalary += calculateNetSalary(emp);
    }

    cout << fixed << setprecision(2);

    cout << "\n========== SALARY SUMMARY ==========\n";
    cout << "Total Employees : " << employees.size() << '\n';
    cout << "Total Payroll    : Rs. " << totalSalary << '\n';
    cout << "====================================\n";
}

// Main function
int main() {

    loadEmployees();

    int choice;

    do {

        cout << "\n\n====================================\n";
        cout << "         EMPLOYEE PAYROLL TOOL\n";
        cout << "====================================\n";
        cout << "1. Add Employee\n";
        cout << "2. Display Employees\n";
        cout << "3. Search Employee\n";
        cout << "4. Delete Employee\n";
        cout << "5. Salary Summary\n";
        cout << "6. Exit\n";
        cout << "====================================\n";

        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {

            case 1:
                addEmployee();
                break;

            case 2:
                displayEmployees();
                break;

            case 3:
                searchEmployee();
                break;

            case 4:
                deleteEmployee();
                break;

            case 5:
                salarySummary();
                break;

            case 6:
                cout << "\nThank you for using Employee Payroll Tool!\n";
                break;

            default:
                cout << "\nInvalid choice! Try again.\n";
        }

    } while (choice != 6);

    return 0;
}