var x;
{
	read(x);
	write(x);
}

use var x(y) to bind variable x to address of y

use var x to declare variable x with auto-assign address

a just use it

*a use it as address

you can use if-else(no elseif), while, break, continue

you can use a = expression, a++, a--

you can use +, -

you can use >, <, >=, <=, ==, !=

build-in function read(x), write(x)