> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qu.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Solidity

> The Solidity smart contract programming language.

## Overview

Solidity is a contract-oriented, high-level programming language for creating smart contracts. It was influenced by C++, Python, and JavaScript and is designed to target the Ethereum Virtual Machine (EVM) environments. Solidity is statically typed, supports inheritance, and libraries. It allows developers to create smart contracts for a wide range of use cases and applications. Key features of Solidity include:

* Complex user-defined types
* Inheritance and complex user-defined contracts
* Error checking, including requirements and assertions
* Support for libraries and user-defined functions
* Strong security features that ensure contract integrity.

<Warning>
  The Quai Network EVM supports Solidity versions up to
  [0.8.19](https://github.com/ethereum/solidity/releases/tag/v0.8.19). Using a
  newer version of Solidity may result in errors when deploying smart contracts.
</Warning>

## Example Contract

The Greeter contract shown below is written with [Solidity v0.8.0](https://docs.soliditylang.org/en/v0.8.0/). Greeter serves two functions:

* Store a greeting on-chain.
* Return the greeting when the contract function is called.

It also contains a function for users to set a new greeting of their choice. While the Greeter contract may be simple, it showcases some of the unique functionality that smart contracts offer.

```solidity Greeter.sol theme={null}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Greeter {
    string private greeting;

    function greet() public view returns (string memory) {
        return greeting;
    }

    function setGreeting(string memory _greeting) public {
        console.log("Changing greeting from '%s' to '%s'", greeting, _greeting);
        greeting = _greeting;
    }
}
```

## Resources

|                                                                              |                                                                      |
| ---------------------------------------------------------------------------- | -------------------------------------------------------------------- |
| [Solidity Homepage](https://soliditylang.org/)                               | The official Solidity homepage.                                      |
| [Solidity Documentation](https://docs.soliditylang.org/en/v0.8.19/)          | The official Solidity documentation.                                 |
| [GitHub](https://github.com/ethereum/solidity)                               | The Solidity GitHub Repository.                                      |
| [Examples](https://docs.soliditylang.org/en/latest/solidity-by-example.html) | Solidity by Example - a collection of example contracts in Solidity. |