What is wrong with this code in C$++,$ meant to use user defined function $($no recursion$)$ to calculate fibonacci sequence?

#include

using namespace std;

int x;

int fibonacci$($int$)\{$

int new$\_$number $=($x $-1)+($x $-2)$;

cout $<<$ new$\_$number;

return new$\_$number;

$\}$

int main$()$

$\{$

int n $=0$;

int new$\_$number $=0$;

int x $=0$;

cout $<<"$

Enter number up to which you would like a fibonacci sequence for $"<<$ endl;

cin $>>$ x;

for $($int i $=0$; i $=$ x; i$++)\{$

if $($x $==0)$

cout $<<$ x $<<$ endl;

else if $($x $==1)$

cout $<<$ x $<<$ endl;

else $\{$

i $=$ x;

x$++$;

fibonacci$($x$)$;

$\}$

cout $<<$ new$\_$number $<<$ endl;

$\}$

$\}$