The layout of a Solidity source code file

In the following subsections, we will look at the components of a Solidity source code file, which is important to cover before we move on to writing smart contracts in the next section.

Version pragma

In order to address compatibility issues that may arise from future versions of the solc version, pragma can be used to specify the version of the compatible compiler as in the following example:

pragma solidity ^0.5.0

This will ensure that the source file does not compile with versions lower than 0.5.0 and versions starting from 0.6.0.

Import

Import in Solidity allows the importing of symbols from the existing Solidity files into the current global scope. This is similar to import statements available in JavaScript, as in the following:, for example:

import "module-name";

Comments

Comments can be added to the Solidity source code file in a manner similar to the C language. Multiple...