For 4x4 keyboards, use the Case Switch method to program the 4x4<br>Keyboard. First, we use an array to build the keyboard, enter it, and then set<br>In some cases, depending on the conditions under which you are using the keyboard. By setting up sixteen cases, each<br>The cause of the case is a button, which means that after pressing the button, a case<br><br>will run. For example, when the button "1" is pressed, the program will run "1",<br>Wait a minute. Before we do, we need to check if any buttons are pressed.
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