Problem $2$: Trace the execution of the following program line$-$by$-$line and record the value of each variable and any change in value.

$20$ Points

void main$()$

int $x=0$;

int $v[4]=\{2,1,4,3\}$;

for $($int $n=0$;$n<mn>3</mn>$;$n++)$

if $)\}$

$v[n]=v[n+1]$;

$v[n+1]=\{\{x$;$,$