A smart contract in seven lines of code

In this section you will learn to code your first smart contract in just seven lines of code (Loc), no hidden terms and conditions. And did I say that you do not need any special software, apart from your web browser, or to spend any real ethers from your pocket? Let's see. I am using Windows 7 (64 bit OS) and a Google Chrome browser:

1. Open your Google Chrome browser and type remix solidity in Google, as show in Figure 3.1:

1. Click the highlighted link in Figure 3.2. You can also type the following in your browser URL box to get to the website directly: http://remix.ethereum.org:

1. Click the plus sign as marked in Figure 3.3 to create a new untitled Solidity (.sol) file.

Rename it HelloWorld.sol and confirm the renaming, as shown in Figure 3.4:

1. Write the following seven lines of code in the HelloWorld.sol file, as shown in Figure 3.5:

Choose the JavaScript VM Environment option, as shown in Figure 3.6:

1. Click the Create button, as highlighted in Figure 3.7. Voila! You just created your smart contract. The only caveat is that we would be simulating it on our local machine using in-memory, which mimics an Ethereum blockchain:

1. To execute this contract, we press that myFirstHelloWorld button, as shown in Figure 3.8. We get the desired output: Hello World !

1. We can also explore the byte codes, which are generated as a result of this smart contract execution, by pressing the Launch debugger | Instructions or just by clicking the Contract details (bytecode, interface etc) link. Figure 3.9 depicts the 368 bytes of virtual machine code generated by the hello world smart contract execution: