Question $3$ IN C$++$

Consider the class definition below and answer the questions that follow:

class InsurancePolicy

$\{$

public:

InsurancePolicy$()$;

InsurancePolicy$($int pNr$,$ string pHolder, double aRate$)$;

~InsurancePolicy$()$;

void setPolicy$($int pNr$,$ string pHolder, double aRate$)$;int

get$\_$pNr$()$const;

string get$\_$pHolder$()$const;

double get$\_$aRate$()$const;

private:

int policyNr; string

policyHolder;double

annualRate;

$\}$;

$($a$)$ Implement the class InsurancePolicy.

$($b$)$ Code the interface for a class CarInsurance derived from class

InsurancePolicy $($the base class$).$ This class has an additional member

variable, excess. Class InsurancePolicy also has member functions,

get$\_$excess$()$ and set$\_$excess$()$to return the value of member

variable excess and update the value of member variable excess

respectively. The class CarInsurance should override function

showPolicy$()$ in order to display the member variables of

CarInsurance and also override member function setPolicy$()$ in

order to update the member variables of CarInsurance.