#include

#include

using namespace std;

$/**$

A simulated traffic light.

$*/$

class TrafficLight

$\{$

public:

$/**$

Constructs a green traffic light.

$*/$

TrafficLight$()$;

$/**$

Constructs a traffic light.

@param initial$\_$color the initial color "green", "yellow", or "red"

$*/$

TrafficLight$($string initial$\_$color$)$;

$/**$

Moves this traffic light to the next color.

$*/$

void next$()$;

$/**$

Returns the current color of this traffic light.

@return the current color

$*/$

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

$/**$

Counts how often this traffic light has been red.

@return the number of times this traffic light has been red

$*/$

int get$\_$reds$()$ const;

private:

int steps;

$\}$;

TrafficLight::TrafficLight$()$

$\{$

$/*$ Your code goes here $*/$

$\}$

TrafficLight::TrafficLight$($string initial$\_$color$)$

$\{$

$/*$ Your code goes here $*/$

$\}$

void TrafficLight::next$()$

$\{$

$/*$ Your code goes here $*/$

$\}$

string TrafficLight::get$\_$color$()$ const

$\{$

$/*$ Your code goes here $*/$

$\}$

int TrafficLight::get$\_$reds$()$ const

$\{$

$/*$ Your code goes here $*/$

$\}$

int main$()$

$\{$

TrafficLight tl$1$;

cout $$ tl$1.$get$\_$color$()$ endl;

cout $$ "Expected: green" $$ endl;

cout $$ tl$1.$get$\_$reds$()$ endl;

cout $$ "Expected: $0$

$"$ endl;

tl$1.$next$()$;

cout $$ tl$1.$get$\_$color$()$ endl;

cout $$ "Expected: yellow" $$ endl;

cout $$ tl$1.$get$\_$reds$()$ endl;

cout $$ "Expected: $0$

$"$ endl;

tl$1.$next$()$;

cout $$ tl$1.$get$\_$color$()$ endl;

cout $$ "Expected: red" $$ endl;

cout $$ tl$1.$get$\_$reds$()$ endl;

cout $$ "Expected: $1$

$"$ endl;

tl$1.$next$()$;

cout $$ tl$1.$get$\_$color$()$ endl;

cout $$ "Expected: green" $$ endl;

cout $$ tl$1.$get$\_$reds$()$ endl;

cout $$ "Expected: $1$

$"$ endl;

TrafficLight tl$2("$red$")$;

cout $$ tl$2.$get$\_$color$()$ endl;

cout $$ "Expected: red" $$ endl;

cout $$ tl$2.$get$\_$reds$()$ endl;

cout $$ "Expected: $1$

$"$ endl;

tl$2.$next$()$;

cout $$ tl$2.$get$\_$color$()$ endl;

cout $$ "Expected: green" $$ endl;

cout $$ tl$2.$get$\_$reds$()$ endl;

cout $$ "Expected: $1$

$"$ endl;

tl$2.$next$()$;

tl$2.$next$()$;

cout $$ tl$2.$get$\_$color$()$ endl;

cout $$ "Expected: red" $$ endl;

cout $$ tl$2.$get$\_$reds$()$ endl;

cout $$ "Expected: $2"$ endl;

return $0$;

$\}$ Reimplement the TrafficLight class using a simple counter that is advanced in each call to next. If the traffic light was

initially green, the counter has values $0123456$dots. If the traffic light was initially red, the counter has values $2345678...$

Compute the current color and the number of reds, using integer division and remainder.