What is the output of the following code snippet?

class Car

$\{$

public:

Car$($double speed$)$;

void start$()$;

void accelerate$($double speed$)$;

void stop$()$;

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

private:

double speed;

$\}$;

Car::Car$($double speed$)$

$\{$

this$->$speed $=$ speed;

$\}$

void Car::start$()$

$\{$

speed $=1$;

$\}$

void Car::accelerate$($double speed$)$

$\{$

this$->$speed $=$ this$->$speed $+$ speed;

$\}$

void Car::stop$()$

$\{$

speed $=0$;

$\}$

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

$\{$

return speed;

$\}$

int main$()$

$\{$

Car$*$ c$1=$ new Car$(90)$;

c$1->$start$()$;

c$1->$accelerate$(90)$;

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

c$1->$stop$()$;

return $0$;

$\}$