Newby学习稳健性分析错误

Question

当我试图编译时，我会得到这个错误。

Airlines.sol:49:5: ParserError:预期“{”，但得到“非法”➥公开{

以下是代码：

pragma solidity ^0.6.0;    
//SPDX-License-Identifier: UNLICENSED for non-open-source code.  Please see https://spdx.org for more information
    contract Airlines  {
    address chairperson;
    struct details{
        uint escrow; // deposit for payment settlement
        uint status;
        uint hashOfDetails;
    }
    
    mapping (address=>details) public balanceDetails;
    mapping (address=>uint) membership;
    
    // modifiers or rules
    modifier onlyChairperson{
        require(msg.sender==chairperson);
        _;
    }
    modifier onlyMember{
        require(membership[msg.sender]==1);
        _;
    }
    
    // constructor function
    constructor () public payable  {
      
        chairperson=msg.sender;
        membership[msg.sender]=1; // automatically registered
        balanceDetails[msg.sender].escrow = msg.value;
    }
    
    function register ( ) public payable{
        
        address AirlineA = msg.sender;
        membership[AirlineA]=1;
        balanceDetails[msg.sender].escrow = msg.value;
    }
        
   function unregister (address payable AirlineZ) onlyChairperson public {
        if(chairperson!=msg.sender){
            revert(); }
        membership[AirlineZ]=0;
        // return escrow to leaving airline: verify other conditions 
        AirlineZ.transfer(balanceDetails[AirlineZ].escrow);
        balanceDetails[AirlineZ].escrow = 0; 
    }
    
    function request(address toAirline, uint hashOfDetails) onlyMember
    ➥ public{
        if(membership[toAirline]!=1){
            revert(); }
        balanceDetails[msg.sender].status=0;
        balanceDetails[msg.sender].hashOfDetails = hashOfDetails;
    }
    
    function  response(address fromAirline, uint hashOfDetails, uint done) 
                               onlyMember public{
      
        if(membership[fromAirline]!=1){
            revert();  }
        balanceDetails[msg.sender].status=done;
        balanceDetails[fromAirline].hashOfDetails = hashOfDetails;
    }
    
    
function settlePayment  (address payable toAirline) onlyMember payable     
                                       public{
        address fromAirline=msg.sender;
        uint amt = msg.value; 
        balanceDetails[toAirline].escrow = balanceDetails[toAirline].escrow 
                                                   + amt;
        balanceDetails[fromAirline].escrow =      
                balanceDetails[fromAirline].escrow - amt;
       
       // amt subtracted from msg.sender and given to toAirline
        toAirline.transfer(amt

Answer 1

尝试在一行中设置方法的签名。在代码中，使用以下内容更改request()函数：

function request(address toAirline, uint hashOfDetails) onlyMember public{
        if(membership[toAirline]!=1){
            revert(); }
        balanceDetails[msg.sender].status=0;
        balanceDetails[msg.sender].hashOfDetails = hashOfDetails;
}

Answer 2

如果从代码中删除➥，该问题将得到解决。

不管怎么说，我推荐你通过稳健编码的样式指南。它可能会使您更容易发现将来的问题，使代码更易读和更易于维护。