Write a program to create a class named Employee_Info with data member Emp_Id and Emp_Name. Create another Class named Finance_Info from Employee_Info with data member Bas_sal and Ot_sal. Create an independent class Extra_allowances with data Member Tray_All, House_All and Dail_all. Now, derive another class named Total_Info from Finance_Info and Extra_allowances with data member Tot_sal. Make necessary function for the above and show the Gross Salary.

 Here's a program that implements the given problem statement:

#include <iostream>
#include <string>
using namespace std;

class Employee_Info {
protected:
    int Emp_Id;
    string Emp_Name;
public:
    void set_emp_info(int id, string name) {
        Emp_Id = id;
        Emp_Name = name;
    }
};

class Finance_Info : public Employee_Info {
protected:
    float Bas_sal;
    float Ot_sal;
public:
    void set_finance_info(float basic, float overtime) {
        Bas_sal = basic;
        Ot_sal = overtime;
    }
};

class Extra_allowances {
protected:
    float Tray_All;
    float House_All;
    float Dail_all;
public:
    void set_allowances(float tray, float house, float daily) {
        Tray_All = tray;
        House_All = house;
        Dail_all = daily;
    }
};

class Total_Info : public Finance_Info, public Extra_allowances {
private:
    float Tot_sal;
public:
    void calculate_salary() {
        Tot_sal = Bas_sal + Ot_sal + Tray_All + House_All + Dail_all;
    }
    void display_salary() {
        cout << "Employee ID: " << Emp_Id << endl;
        cout << "Employee Name: " << Emp_Name << endl;
        cout << "Gross Salary: " << Tot_sal << endl;
    }
};

int main() {
    Total_Info employee;
    employee.set_emp_info(1001, "John Doe");
    employee.set_finance_info(5000.00, 1000.00);
    employee.set_allowances(500.00, 1000.00, 100.00);
    employee.calculate_salary();
    employee.display_salary();
    return 0;
}

In this program, we have four classes:

Employee_Info with two data members Emp_Id and Emp_Name

Finance_Info derived from Employee_Info with two additional data members Bas_sal and Ot_sal

Extra_allowances with three data members Tray_All, House_All, and Dail_all

Total_Info derived from Finance_Info and Extra_allowances with an additional data member Tot_sal

We have also defined various member functions to set and get data members for each of these classes. In the main() function, we have created an object of Total_Info class, set values for all the data members using the member functions, calculated the gross salary using the calculate_salary() function, and displayed the employee information and gross salary using the display_salary() function.