If you've ever used a vending machine, you already understand the core idea of a function. You put in a dollar, press a code, and out comes a snack. Every time you do that same action, you expect the ......
Division by zero seems like it should work. After all, you can divide by one, by ten, by a million. But try dividing by zero on your calculator and you'll get an error message. Some calculators say "u...
