$5-$ What is the output of this C code?

int $i=0$;

char $c={?}^{\text{'}}a\text{'}$;

while

i$++$;

switch $($c$)\{$

case $\text{'}a\text{'}$:

printf$("\%$c $",$ c$)$;

break;

$\}$

$\}$

printf$("$by

$")$;