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a guest Mar 19th, 2019 60 Never
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  1. pragma solidity ^0.5.6;
  2.  
  3. contract Contract {
  4.    
  5.     struct transaction{
  6.         address buyerAddr;
  7.         address sellerAddr;
  8.         uint priceOfItem;
  9.     }
  10.    
  11.     mapping (address => uint) userBalances;
  12.    
  13.     mapping (address => transaction) transactions;
  14.    
  15.     function settlePayment(address transactionAddr) public {
  16.         address buyerAddr = transactions[transactionAddr].buyerAddr;
  17.         address sellerAddr = transactions[transactionAddr].sellerAddr;
  18.         uint itemPrice = transactions[transactionAddr].priceOfItem;
  19.        
  20.         userBalances[buyerAddr] = userBalances[buyerAddr] - itemPrice;
  21.         userBalances[sellerAddr] = userBalances[sellerAddr] + itemPrice;
  22.     }
  23.    
  24.     function buyItem(address buyerAddr, address sellerAddr, uint itemPrice) public {
  25.         address transactionAddr = msg.sender;
  26.        
  27.         transactions[transactionAddr] =
  28.         transaction(
  29.         {
  30.             buyerAddr : buyerAddr,
  31.             sellerAddr : sellerAddr,
  32.             priceOfItem : itemPrice
  33.         });
  34.     }
  35.    
  36.     function deposit(uint amount) public {
  37.         address user = msg.sender;
  38.         userBalances[user] += amount;
  39.     }
  40.    
  41.     function register() public {
  42.         address user = msg.sender;
  43.         userBalances[user] = 500;
  44.     }
  45.    
  46.     function unregister() public {
  47.         address user = msg.sender;
  48.         delete userBalances[user];
  49.     }
  50. }
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