Why is this code not working $??$#include

#include "Dog.h$"$

#include "Cat.h$"$

#include "Bird.h$"$

void displayMenu$()\{$

std::cout $<<"*****$Pet Program$*****$

$"$

$<<$ "Please enter $1$ for a Dog:

$"$

$<<$ "Please enter $2$ for a Cat:

$"$

$<<$ "Please enter $3$ for a Bird:

$"$

$<<$ "Please enter $4$ to exit:

$"$;

$\}$

int main$()\{$

int choice;

std::string fName, lName, pName;

int year;

std::string breed, color;

do $\{$

displayMenu$()$;

std::cin $>>$ choice;

switch $($choice$)\{$

case $1$:

$//$ Collect details for Dog and create Dog object, then print

break;

case $2$:

$//$ Collect details for Cat and create Cat object, then print

break;

case $3$:

$//$ Collect details for Bird and create Bird object, then print

break;

case $4$:

std::cout $<<$ "Exiting program.

$"$;

break;

default:

std::cout $<<$ "Invalid option. Please try again.

$"$;

$\}$

$\}$ while $($choice $!=4)$;

return $0$;

$\}$