What is the output?

#include

using namespace std;

const double LB$\_$PER$\_$KG $=2\mathrm{.}2$;

double KgsToLbs$($double kilograms$)\{$

$$ double pounds;$$

$$ pounds $=$ kilograms $*$ LB$\_$PER$\_$KG;$$

$$ return pounds;

$\}$

int main$()\{$

$$ double pounds;$$

$$ pounds $=$ KgsToLbs$(10)$;

$$ cout $<<$ pounds;

$$ return $0$;

$\}$