SPDX license and pragma version in Blockchain / Solidity - Mini Project: Build & Apply

SPDX License and Pragma Version in Solidity

📖 Scenario: You are creating a simple smart contract for a blockchain project. To make your code clear and compatible with tools, you need to add a license identifier and specify the Solidity compiler version.

🎯 Goal: Learn how to add the SPDX license identifier and the pragma version statement at the top of a Solidity contract.

📋 What You'll Learn

Add the SPDX license identifier comment at the top of the file

Add the pragma solidity version statement below the license

Use the exact license identifier MIT

Use the exact pragma version ^0.8.0

💡 Why This Matters

🌍 Real World

Adding SPDX license identifiers and pragma versions is a standard practice in Solidity smart contract development to ensure legal clarity and compiler compatibility.

💼 Career

Understanding these basics is essential for blockchain developers to write professional and maintainable smart contracts.

1

Add SPDX License Identifier

Add the SPDX license identifier comment // SPDX-License-Identifier: MIT as the very first line of your Solidity file.

Blockchain / Solidity

// Your code here

Need a hint?

The SPDX license identifier is a comment that starts with // SPDX-License-Identifier: followed by the license name.

2

Add Pragma Solidity Version

Below the SPDX license identifier, add the pragma solidity version statement pragma solidity ^0.8.0; to specify the compiler version.

Blockchain / Solidity

// SPDX-License-Identifier: MIT
// Your code here

Need a hint?

The pragma statement tells the compiler which Solidity versions are allowed.

3

Create a Simple Contract

Create a simple contract named MyContract below the pragma statement using contract MyContract { }.

Blockchain / Solidity

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
// Your code here

Need a hint?

A contract is defined using the keyword contract followed by its name and curly braces.

4

Output the Contract Code

Print the entire contract code as a string using console.log in JavaScript or just display the code as output. For this exercise, just print the SPDX line, pragma line, and contract declaration exactly as written.

Blockchain / Solidity

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract MyContract {

}

// Your code here

Need a hint?

Use a print statement to show the full contract code exactly as it appears.