Download Professional Symbian Programming: Mobile Solutions on the by Jonathan Allin, Visit Amazon's Martin Tasker Page, search PDF

By Jonathan Allin, Visit Amazon's Martin Tasker Page, search results, Learn about Author Central, Martin Tasker, , Jonathan Dixon, Mark Shackman, Tim Richardson, John Forrest

Considered one of few books on Symbain. The programming is really easy and this ebook takes you from newbie to improve.

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Global variables (such as ledPin in the preceding example) can be used from anywhere in the program. On the other hand, local variables such as parameters to functions (pin and n in this example) and even i inside the for loop are only accessible within the function in which they are defined. So, in setup(), the line blink(ledPin, 5) passes the global variable ledPin into the function blink, where it will be assigned to the local variable pin. You might wonder why you should do this. The answer is that by passing in the pin to blink, we make the blink function general purpose, so it can be used to flash any pin we tell it to, rather than just ledPin.

These are useful for attaching a keyboard and mouse, as well as other peripherals, such as printers, scanners, and Flash drives. Below the USB ports, you will find an RJ45 Ethernet socket that allows you to connect your Raspberry Pi to your home router via cable. You will need to get your Raspberry Pi connected to your network so that you can access the Internet and install software onto the Raspberrry Pi. It can be more convienent to cut out the cable and use a USB WiFi adapter. Such an adapter only costs a few dollars and can be plugged into a USB port.

So, you use setup() to do all the things you need to do just once when the program starts. In the case of Blink, this just means specifying that the LED pin is set to be an output. The commands inside the loop() function will be run over and over again—that is, as soon as the last of the command lines in loop() has done its business, it will start over on the first line again. I have skipped over what the commands inside setup() and loop() actually do in Blink, but don’t worry, I will discuss them soon.

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