class Animal

$\{$

public:

Animal$()$;

virtual void set$\_$speed$($double new$\_$speed$)$;

void accelerate$($double new$\_$speed$)$;

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

private:

double speed;

$\}$;

Animal::Animal$()$

$\{$

speed $=0$;

$\}$

void Animal::set$\_$speed$($double new$\_$speed$)$

$\{$

speed $=$ new$\_$speed;

$\}$

void Animal::accelerate$($double new$\_$speed$)$

$\{$

speed $=$ speed $+$ new$\_$speed;

$\}$

double Animal::get$\_$speed$()$ const

$\{$

return speed;

$\}$

class Cheetah : public Animal

$\{$

public:

Cheetah$()$;

void set$\_$speed$($double new$\_$speed$)$;

virtual void accelerate$($double new$\_$speed$)$;

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

$\}$;

Cheetah::Cheetah$()$

: Animal$()$

$\{\}$

void Cheetah::set$\_$speed$($double new$\_$speed$)$

$\{$

Animal::set$\_$speed$($Animal::get$\_$speed$()+$ new$\_$speed$)$;

$\}$

void Cheetah::accelerate$($double new$\_$speed$)$

$\{$

Animal::set$\_$speed$($new$\_$speed$)$;

$\}$

double Cheetah::get$\_$speed$()$ const

$\{$

return Animal::get$\_$speed$()$;

$\}$

int main$()$

$\{$

Cheetah ch$1$;

Cheetah$*$ ch$2=$ new Cheetah;

ch$1.$set$\_$speed$(100)$;

ch$1.$accelerate$(200)$;

ch$2->$set$\_$speed$(100)$;

ch$2->$accelerate$(200)$;

Animal$*$ c$1=$ new Animal;

c$1=$ ch$2$;

cout $<<$ "Cheetah Speed: $"<<$ ch$1.$get$\_$speed$()$

$<<"$; Animal Speed: $"<<$ c$1->$get$\_$speed$()$;

return $0$;

$\}$