Mastering Blockchain Programming with Solidity

The layout of a Solidity source file

A Solidity source file can contain any number of contracts/library definitions in a single file. It is recommended that the developer should maintain the different source files for each contract/library definition to have the readability and code maintainability. The Solidity contract/library file extension is .sol, for example, SampleContract.sol.

The basic layout of the Solidity source file contains following in order:

• The Solidity version to use
• Experimental pragma if any
• Import statements to import other contracts/libraries
• Contract definition covered in the Structure of Contract section in this chapter