Page 247 -

test drive

Test Drive

Let’s try running the new program and buy a $1.20 muffin without
a discount card.

00001085413765853576543 MUFFIN
But what if you try to buy a $2.20 latte using a
Starbuzz card? It cost $1.08 = 90% of $1.20. It's a muffin.

00001885413765835766543 LATTE
The code works! With the Starbuzz card, it applies
two discounts. Without a Starbuzz card, your code
just applies one. 90% of $2.20 = $1.98. It's a latte.
5% Starbuzz discount
212 Chapter 6 of that gives $1.88!