Question

The machine has a small keypad with keys 0 to 9, OK and CANCEL. It also has a small LCD screen, which can display a short message. To get a drink, users select an item number between 1 and 20 with the keypad and confirm their choice by pressing OK. If they make a mistake they can press the CANCEL button and start again. If the selection is valid and the drink is available it dispenses the drink. What is the purpose of the OK button on the machine's keypad?

1) To confirm the selected item number
2) To cancel the selection
3) To display a short message on the LCD screen
4) To start the machine again

Answer 1

The purpose of the OK button is to confirm the selected item number on the machine's keypad.

Step-by-step explanation:

The purpose of the OK button on the machine's keypad is to confirm the selected item number. When users select an item number between 1 and 20 using the keypad, they press the OK button to finalize their choice. If they make a mistake, they can press the CANCEL button to start again.