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Vedant Chainani
Vedant Chainani

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Day 1 - Licenses and Pragma

#100daysofcode #solidity #web3 #blockchain

This is Day 1 of 30 in Solidity Series.

Today I Learned About Licenses and Pragma Keyword in Solidity

Licenses 

// SPDX-License-Identifier: License Name
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SPDX license identifiers should be added to the top of contract files.
The license should be from one of the following: https://spdx.org/licenses/.

⚠️ If the license identifier isn’t included in the contract file the compiler will now show a warning.

❗ If there are multiple license identifiers in the contract file the compiler will now show an error.

eg -

// SPDX-License-Identifier: MIT
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Pragma

In Solidity the pragma keyword is used to configure compiler features and checks. The pragma directive is always local to the current file and is not global. Hence to make it applicable in your entire project of Solidity you have to include pragma directive in every file to work.

The first line is a pragma directive which tells that the source code is written for which Solidity version.

pragma solidity ^0.8.7;
// Anything above 0.8.7

pragma solidity >=0.8.0 <0.9.0;
// Anything between 0.8.0 to 0.9.0 where 0.9.0 is not included.

pragma solidity 0.8.7;
// Only Version 0.8.7
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GitHub logo envoy1084 / 30-Days-of-Solidity

30 Days of Solidity step-by-step guide to learn Smart Contract Development.

Solidity

WARNING: This repository is currently undergoing updates and revisions to incorporate the latest information and advancements in Solidity programming. Please be advised that the content may not be up-to-date or accurate during this time. We expect the updates to be completed within the next 30 days, and appreciate your patience during this process. Thank you for your understanding.

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