Book Image

C Programming for Arduino

By : Julien Bayle
Book Image

C Programming for Arduino

By: Julien Bayle

Overview of this book

Physical computing allows us to build interactive physical systems by using software & hardware in order to sense and respond to the real world. C Programming for Arduino will show you how to harness powerful capabilities like sensing, feedbacks, programming and even wiring and developing your own autonomous systems. C Programming for Arduino contains everything you need to directly start wiring and coding your own electronic project. You'll learn C and how to code several types of firmware for your Arduino, and then move on to design small typical systems to understand how handling buttons, leds, LCD, network modules and much more. After running through C/C++ for the Arduino, you'll learn how to control your software by using real buttons and distance sensors and even discover how you can use your Arduino with the Processing framework so that they work in unison. Advanced coverage includes using Wi-Fi networks and batteries to make your Arduino-based hardware more mobile and flexible without wires. If you want to learn how to build your own electronic devices with powerful open-source technology, then this book is for you.
Table of Contents (21 chapters)
C Programming for Arduino
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Operators, operator structures, and precedence


We have already met a lot of operators. Let's first check the arithmetic operators.

Arithmetic operators and types

Arithmetic operators are:

  • + (plus sign)

  • - (minus)

  • * (asterisk)

  • / (slash)

  • % (percent)

  • = (equal)

I'm beginning with the last one: = . It is the assignment operator. We have already used it a lot to define a variable, which just means to assign a value to it. For instance:

int oscillatorFrequency = 440;

For the other operators, I'm going to distinguish two different cases in the following: character types, which include char and String, and numerical types. Operators can change their effect a bit according to the types of variables.

Character types

char and String can only be processed by +. As you may have guessed, + is the concatenation operator:

String myString = "Hello ";
String myString2 = "World";

String myResultString = myString + myString2;
myString.concat(myString2);

In this code, concatenation of myResultString and myString results...