Ex: If the input is $4\mathrm{.}0,2*0,$ then the output is:

$y=4\mathrm{.}0$

int main$()\{$

double w;

double $x$;

double $y$;

cin $w$;

cin $x$;

I$*$ Your code goes here $*/$

cout y$="$;

cout $$ fixed $$ setprecision$(1)$; $//$ set,

cout $$ endl;

return $$;