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Solidity Programming Essentials

Solidity Programming Essentials

3.6 (10)
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Solidity Programming Essentials

Solidity Programming Essentials

3.6 (10)

Overview of this book

Solidity is a contract-oriented language whose syntax is highly influenced by JavaScript, and is designed to compile code for the Ethereum Virtual Machine. Solidity Programming Essentials will be your guide to understanding Solidity programming to build smart contracts for Ethereum and blockchain from ground-up. We begin with a brief run-through of blockchain, Ethereum, and their most important concepts or components. You will learn how to install all the necessary tools to write, test, and debug Solidity contracts on Ethereum. Then, you will explore the layout of a Solidity source file and work with the different data types. The next set of recipes will help you work with operators, control structures, and data structures while building your smart contracts. We take you through function calls, return types, function modifers, and recipes in object-oriented programming with Solidity. Learn all you can on event logging and exception handling, as well as testing and debugging smart contracts. By the end of this book, you will be able to write, deploy, and test smart contracts in Ethereum. This book will bring forth the essence of writing contracts using Solidity and also help you develop Solidity skills in no time.
Table of Contents (12 chapters)
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Integers


Integers help in storing numbers in contracts. Solidity provides the following two types of integer:

  • Signed integers: Signed integers can hold both negative and positive values. 
  • Unsigned integers: Unsigned integers can hold only positive values along with zero. They can also hold negative values apart from positive and zero values.

There are multiple flavors of integers in Solidity for each of these types. Solidity provides uint8 type to represent 8 bit unsigned integer and thereon in multiples of 8 till it reaches 256. In short, there could be 32 different declarations of uint with different multiples of of 8, such as uint8, uint16, unit24, as far as uint256 bit. Similarly, there are equivalent data types for integers such as int8, int16 till int256.

Depending on requirements, an appropriately sized integer should be chosen. For example, while storing values between 0 and 255 uint8 is appropriate, and while storing values between -128 to 127 int8 is more suitable. For higher values...

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