What is the output of this program?

#include

using namespace std;

int Add$($int X$,$ int Y$,$ int Z$)$

$\{$

return X $+$ Y;

$\}$

double Add$($double X$,$ double Y$,$ double Z$)$

$\{$

return X $+$ Y;

$\}$

int main$()$

$\{$

cout $<<$ Add$(5,6)<<"\backslash$t$"$;

cout $<<$ Add$(5\mathrm{.}5,6\mathrm{.}6)$;

return $0$;

$\}$