program AddAndSub;

#include("stdlib.hhf")

static
    eight_bit_integer: 		int8	:= 7;

begin AddAndSub;

    stdout.put
    (
	nl,
	"Initialized values: eight_bit_integer=", 
	eight_bit_integer,
	nl
    );

    mov( 0, dh ); // `al` is an eight-bit register
    sub( eight_bit_integer, dh ); // `al` minus `eight_bit_integer` 
    mov( dh, eight_bit_integer ); // this should be -7

    stdout.put(nl, "Now eight_bit_integer = ", eight_bit_integer, nl);
    // add( 135, eight_bit_integer);
    // stdout.put(nl, "Now eight_bit_integer = ", eight_bit_integer, nl);
   
end AddAndSub;