#include

using namespace std;

void displayFibonacci$($int n$)\{$

int a $=0,$ b $=1,$ next;

for $($int i $=1$; i $<=$ n; $++$i$)\{$

cout $<<$ b $<<""$;

next $=$ a $+$ b;

a $=$ b;

b $=$ next;

$\}$

cout $<<$ endl;

$\}$

int factorial$($int n$)\{$

if $($n $<=1)$ return $1$;

return n $*$ factorial$($n $-1)$;

$\}$

int main$()\{$

char choice;

do $\{$

int option;

cout $<<$ "Menu:

$"$;

cout $<<"1.$ Display Fibonacci Series

$"$;

cout $<<"2.$ Compute Factorial

$"$;

cout $<<$ "Enter your choice: $"$;

cin $>>$ option;

if $($option $==1)\{$

int num;

cout $<<$ "Enter a Number: $"$;

cin $>>$ num;

displayFibonacci$($num$)$;

$\}$ else if $($option $==2)\{$

int num;

cout $<<$ "Enter a Number: $"$;

cin $>>$ num;

cout $<<$ "Factorial of $"<<$ num $<<"$ is $"<<$ factorial$($num$)<<$ endl;

$\}$ else $\{$

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

$"$;

$\}$

cout $<<$ "Return to Main Menu? $[$Y$/$N$]$: $"$;

cin $>>$ choice;

$\}$ while $($choice $==\text{'}$Y$\text{'}||$ choice $==\text{'}$y$\text{'})$;

return $0$;

$\}$