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Questions and Answers
Solidity's code is encapsulated in ______.
contracts
A ______ is the fundamental building block of Ethereum applications.
contract
All variables and functions belong to a ______.
contract
An empty contract named HelloWorld would look like this: ______ HelloWorld { }
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All solidity source code should start with a ______ pragma — a declaration of the version of the Solidity compiler.
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Study Notes
Solidity Basics
- Solidity code is organized into contracts, which are the fundamental building blocks of Ethereum applications.
- A contract is the starting point of all projects, and all variables and functions belong to a contract.
Contract Structure
- A basic empty contract in Solidity is defined using the
contractkeyword followed by the contract name, e.g.,contract HelloWorld { }.
Version Pragma
- Version pragma is a declaration of the Solidity compiler version that the code should use.
- The purpose of version pragma is to prevent issues with future compiler versions that might break the code.
- Thepragma statement specifies the compatible compiler version range, e.g.,
pragma solidity >=0.5.0indicates the code can compile with any compiler version from 0.5.0 (inclusive) to 0.6.0 (exclusive).
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Description
Learn the basics of Solidity, including contracts and version pragmas, the fundamental building blocks of Ethereum applications. Understand how to write a simple contract and the importance of version declarations.
