Does the following program have some functional side effects?

#include

void increment$($int $*$num$)\{$

$(*$num$)++$;

$\}$

int main$()\{$

int number $=5$;

printf$("$Before increment: $\%$d

$",$ number$)$;

increment$($&number$)$;

printf$("$After increment: $\%$d

$",$ number$)$;

return $0$;

$\}$