December 2018
Intermediate to advanced
222 pages
6h 6m
English
Content preview from Blockchain Quick Start Guide
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Introduction to smart contracts
Let's begin with the most basic smart contract example, HelloWorld.sol, shown as follows:
pragma solidity ^0.4.24;contract HelloWorld { string public greeting; constructor() public { greeting = 'Hello World'; } function setNewGreeting (string _newGreeting) public { greeting = _newGreeting; }}
Solidity's file extension is .sol. It is similar to .js for JavaScript files, and .html for HTML templates.
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