Examine this code snippet. When will the letter R be printed?

$$ int d;

$$ while $(-1)$

$\{$

$$ printf$("$Enter a number:"$)$;

$$ scanf$("\%$d$",$ &d$)$;

$$ if $($d $==4)$

$$ break;

$$ else

$$ continue;

$$ printf$("$R$")$;

$\}$