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Questions and Answers
What is the fundamental building block of Ethereum applications?
What is the fundamental building block of Ethereum applications?
A contract
What is the purpose of a version pragma in Solidity code?
What is the purpose of a version pragma in Solidity code?
To prevent issues with future compiler versions that would break the code
What is the minimum compiler version required for the code in this tutorial?
What is the minimum compiler version required for the code in this tutorial?
0.5.0
How do you declare an empty contract named HelloWorld in Solidity?
How do you declare an empty contract named HelloWorld in Solidity?
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What is the maximum compiler version that can be used to compile the code in this tutorial?
What is the maximum compiler version that can be used to compile the code in this tutorial?
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Study Notes
Contracts in Solidity
- In Solidity, code is encapsulated in contracts, which are the fundamental building blocks of Ethereum applications.
- A contract is the starting point of all projects in Solidity, and all variables and functions belong to a contract.
- A basic contract in Solidity, named HelloWorld, would be declared as:
contract HelloWorld { }
Version Pragma
- All Solidity source code should start with a "version pragma" to specify the version of the Solidity compiler to use.
- The purpose of the version pragma is to prevent issues with future compiler versions that might introduce changes that break the code.
- The version pragma for this tutorial is:
pragma solidity >=0.5.0 <0.6.0, which means the code can be compiled with any compiler version in the range of 0.5.0 (inclusive) to 0.6.0 (exclusive).
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Description
Learn the basics of Solidity contracts, the fundamental building block of Ethereum applications, including syntax and version pragma.
