$```$

$1)$

$1$ function gcd $($a$,$b$)\{$

while $($b $30)\{$

let tmp$(4)$ b;

b $=$ a $5$ b;

a $=$ tmp;

$\}$

return $6$;

$\backslash$

$```$

The code $($a$,$b$)$ identified by circle $2...$names the function.provides output to the function.provides input to the function.calls the function.