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Learning C for Arduino

You're reading from   Learning C for Arduino A comprehensive guide that will help you ace C's fundamentals using the powerful Arduino board

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781787120099
Length 378 pages
Edition 1st Edition
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Author (1):
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Syed Omar Faruk Towaha Syed Omar Faruk Towaha
Author Profile Icon Syed Omar Faruk Towaha
Syed Omar Faruk Towaha
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Table of Contents (11) Chapters Close

Preface 1. Getting Started FREE CHAPTER 2. Our First Program! 3. Exploring C with Arduino IDE 4. Blinking with Operations and Loops 5. Functions and Files with Arduino 6. Arduino and C++ 7. Using Pointers and Structure 8. Working with Arduino Libraries 9. Lets Build Something Awesome 10. Few Error Handlings

Undeclared functions or undeclared types error


The Arduino environment attempts to automatically generate prototypes for your functions, so that you can order them how you like in your sketch. This process, however, isn't perfect, and sometimes leads to obscure error messages.

If you declare a custom type in your code, and create a function that accepts or returns a value of that type, you'll get an error when you try to compile the sketch. This is because the automatically generated prototype for that function will appear above the type definition.

If you declare a function with a two-word return type (for example, unsigned int), the environment will not realize it's a function and will not create a prototype for it. That means you need to provide your own, or place the definition of the function above any calls to it.

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