in c plus #include

using namespace std;

$/**$

A simulated lock with digit buttons.

$*/$

class Lock

$\{$

public:

$/**$

Simulates a digit button push.

@param button a digit $0...9$

$*/$

void push$($int button$)$;

$/**$

Simulates a push of the open button.

@return true if the lock opened

$*/$

bool open$()$;

private:

int combination $=1729$;

int input $=0$;

$\}$;

void Lock::push$($int button$)$

$\{$

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

$\}$

bool Lock::open$()$

$\{$

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

$\}$

int main$()$

$\{$

Lock my$\_$lock;

my$\_$lock.push$(1)$;

my$\_$lock.push$(7)$;

my$\_$lock.push$(3)$;

my$\_$lock.push$(9)$;

cout $<<$ "Combination: $1739"<<$ endl;

cout $<<$ boolalpha;

cout $<<$ "Expected: false" $<<$ endl;

cout $<<$ "Your output: $"<<$ my$\_$lock.open$()<<$ endl $<<$ endl;

my$\_$lock.push$(1)$;

my$\_$lock.push$(7)$;

my$\_$lock.push$(2)$;

my$\_$lock.push$(9)$;

cout $<<$ "Combination: $1729"<<$ endl;

cout $<<$ "Expected: true" $<<$ endl;

cout $<<$ "Your output: $"<<$ my$\_$lock.open$()<<$ endl $<<$ endl;

my$\_$lock.push$(1)$;

my$\_$lock.push$(7)$;

my$\_$lock.push$(2)$;

cout $<<$ "Combination: $172"<<$ endl;

cout $<<$ "Expected: false" $<<$ endl;

cout $<<$ "Your output: $"<<$ my$\_$lock.open$()<<$ endl $<<$ endl;

my$\_$lock.push$(9)$;

cout $<<$ "Combination: $9"<<$ endl;

cout $<<$ "Expected: false" $<<$ endl;

cout $<<$ "Your output: $"<<$ my$\_$lock.open$()<<$ endl $<<$ endl;

my$\_$lock.push$(1)$;

my$\_$lock.push$(7)$;

my$\_$lock.push$(2)$;

my$\_$lock.push$(9)$;

cout $<<$ "Combination: $1729"<<$ endl;

cout $<<$ "Expected: true" $<<$ endl;

cout $<<$ "Your output: $"<<$ my$\_$lock.open$()<<$ endl;

return $0$;

$\}$