PRG$-3.$ Assume we have he following classes in a polymorphic relationship.

The Employee class is an abstract class. An employee has a first name, an

initial, and a last name. A salary employee receives a fixed salary per month.

An hourly employee receives wages based on the number of hours worked

per month and a fixed rate$/$hour$.$ Write the interface files, the implementation

files for all three classes and then test them in an application file.

$($The sample int main$()$ is stated as follows$/)$

int main $()$

$\{$

$//$ Instantiation of Employee$1$

SalaryEmployee employee$1("$John$",\text{'}$A$\text{'},$ "Pape", $2500)$;

employee$1.$print$()$;

$//$ Instantiation of Employee$2$

HourlyEmployee employee$2("$Lucie$",\text{'}$C$\text{'},$ "Bush" $,70,20\mathrm{.}0)$;

employee$2.$print $()$;

return $0$ ;

$\}$

Run:

Salary Employee:

John A$.$ Pape

Salary : $2500$

Payment: $2500$

Hourly Employee:

Lucie C$.$ Bush

Hours worked: $70$

Rate: $20$

Payment: $1400$