交易所App开发功能｜交易所系统开发源码（demo）

什么是智能合约 从技术角度来说，智能合约可以看作一种计算机程序，这种程序可以自主地执行全部或部分和合约相关的操作，并产生相应的可以被验证的证据，来说明执行合约操作的有效性。 Web3.0的底层技术是分布式账本技术和分布式数据库技术，这就好比操作系统里的文档系统（Filing）和I/O（输出入系统），也像是区块链里的Layer-1数据处理结构。分布式存储就像是操作系统里的文档系统，分布式计算就像是操作系统里的CPU（中央处理器），分布式数据传输（分布式通信）也就好比I/O。CPU、文档系统和I/O都是操作系统的基本要素，类比到Web3.0的底层技术亦是如此。I8O量化2857交易8624系统开发 What is a smart contract From a technical point of view,a smart contract can be seen as a computer program that can independently perform all or part of contract-related operations,and generate corresponding verifiable evidence to illustrate the effectiveness of contract operations. pragma solidity^0.8.0; contract SimpleStorage{ uint public storedData; address public owner= uint256 public money; address public thisAddress=address(this); address public thisAddress2=msg.sender; uint public etherTest=1 gwei; mapping(address=>uint256)public balances; event Set(uint x); enum State{Created,Locked,InValid} State public state; modifier onlyOwner(){ require(owner==msg.sender,"only owner can call this function"); _; } struct Voter{//结构体 uint weight; bool voted; } Voter[]public voter; function set(uint x)public onlyOwner{ storedData=x;// emit Set(storedData); } function setState(State _state)public{ state=_state; } function f(uint len)public pure{ uint[]memory a=new uint[](7); bytes memory b=new bytes(len); assert(a.length==7); assert(b.length==len); a[6]=8; } function setVoter(uint _weight,bool _voted)public{ voter.push(Voter(_weight,_voted)); } function bal()public view returns(uint){//返回余额 return msg.sender.balance; } function testPure(uint x)public pure returns(uint){//纯 return x*2; } function buy()public payable{ assert(msg.value>0);//必须大于0，不然不执行下面的 money+=msg.value; } function mint(address account,uint256 amount)public onlyOwner{//铸币，当前账号才有权限 balance