pragma solidity ^0.4.0;
contract Ballot {
pragma solidity ^0.4.23;

contract shop {
    struct user {
        int balance;
        address ip;
    }

    struct tovar {
        string name;
        int cost;
        address seller;
    }

    address kap;
    user[] users;
    tovar[] tovars;

    function check_costumer(address _ip) private returns(bool){
        bool flag = 0;
        for (i := 0; i < users.length; i++) {
            if (usres[i].ip == _ip) {
                flag = 1;
            }
        }
        return flag;
    }

    function init_user() public {
        bool flag = check_costumer(msg.sender);
        if (!flag) {
            users.length = users.length + 1;
            users[users.length - 1].ip = msg.sender;
            users[users.length - 1].balance = 10000;
        }
        else {
            //пользователь зареган - обработать
        }
    }

    function add_tovar(string _name, int _cost) public {
        bool flag = check_costumer(msg.sender);
        tovars.length = tovars.length + 1;
        tovars[tovars.length - 1].name = _name;
        tovars[tovars.length - 1].cost = _cost;
        tovars[tovars.length - 1].seller = msg.sender;
    }

    function bye_tovar(string _id) public {
        address buy = msg.sender;

    }
}