为什么 getResults 给我“0”

Question

我从其他项目复制了一份智能合约，并尝试从那里做我自己的，我了解可靠性，但我还不够好，无法从头开始制定合约。

因此，在这份合同中我有 6 个计划，值是天数和每日利润百分比。这个每日利润百分比在所有 6 个计划中每天增加 0.5%。

指数 (0) 中的第一个计划有 14 天和 8% 的每日基本利润。

当我使用 getResults 函数时，它会检索更新的每日利润并进行计算，让用户知道如果投资 X 数量的代币将获得多少利润，但不知何故，当我输入 deposit:10 plan:0 给我的利润是 0，如果我输入 deposit:100，plan:0 我得到正确的数学，这让我发疯。

这是智能合约（不得不把它放到一个片段中，因为它破坏了 Whosebug 页面中的 bb 代码）：

pragma solidity >=0.4.22 <0.9.0;

contract testing {
    using SafeMath for uint256;

    uint256 constant public INVEST_MIN_AMOUNT = 10 ether;
    uint256[] public REFERRAL_PERCENTS = [60, 40, 20];
    uint256 constant public PROJECT_FEE = 100;
    uint256 constant public PERCENT_STEP = 5;
    uint256 constant public WITHDRAW_FEE = 1000; //In base point
    uint256 constant public PERCENTS_DIVIDER = 1000;
    uint256 constant public TIME_STEP = 1 days;

    uint256 public totalStaked;
    uint256 public totalRefBonus;

    struct Plan {
        uint256 time;
        uint256 percent;
    }

    Plan[] internal plans;

    struct Deposit {
        uint8 plan;
        uint256 percent;
        uint256 amount;
        uint256 profit;
        uint256 start;
        uint256 finish;
    }

    struct User {
        Deposit[] deposits;
        uint256 checkpoint;
        address referrer;
        uint256[3] levels;
        uint256 bonus;
        uint256 totalBonus;
    }

    mapping (address => User) internal users;

    uint256 public startUNIX;
    address payable public commissionWallet;

    event Newbie(address user);
    event NewDeposit(address indexed user, uint8 plan, uint256 percent, uint256 amount, uint256 profit, uint256 start, uint256 finish);
    event Withdrawn(address indexed user, uint256 amount);
    event RefBonus(address indexed referrer, address indexed referral, uint256 indexed level, uint256 amount);
    event FeePayed(address indexed user, uint256 totalAmount);

    constructor(address payable wallet, uint256 startDate) public {
        require(!isContract(wallet));
        require(startDate > 0);
        commissionWallet = wallet;
        startUNIX = startDate;

        plans.push(Plan(14, 80));
        plans.push(Plan(21, 65));
        plans.push(Plan(28, 50));
        plans.push(Plan(14, 80));
        plans.push(Plan(21, 65));
        plans.push(Plan(28, 50));
    }

    function invest(address referrer, uint8 plan) public payable {
        require(msg.value >= INVEST_MIN_AMOUNT);
        require(plan < 6, "Invalid plan");

        uint256 fee = msg.value.mul(PROJECT_FEE).div(PERCENTS_DIVIDER);
        commissionWallet.transfer(fee);
        emit FeePayed(msg.sender, fee);

        User storage user = users[msg.sender];

        if (user.referrer == address(0)) {
            if (users[referrer].deposits.length > 0 && referrer != msg.sender) {
                user.referrer = referrer;
            }

            address upline = user.referrer;
            for (uint256 i = 0; i < 3; i++) {
                if (upline != address(0)) {
                    users[upline].levels[i] = users[upline].levels[i].add(1);
                    upline = users[upline].referrer;
                } else break;
            }
        }

        if (user.referrer != address(0)) {

            address upline = user.referrer;
            for (uint256 i = 0; i < 3; i++) {
                if (upline != address(0)) {
                    uint256 amount = msg.value.mul(REFERRAL_PERCENTS[i]).div(PERCENTS_DIVIDER);
                    users[upline].bonus = users[upline].bonus.add(amount);
                    users[upline].totalBonus = users[upline].totalBonus.add(amount);
                    emit RefBonus(upline, msg.sender, i, amount);
                    upline = users[upline].referrer;
                } else break;
            }

        }

        if (user.deposits.length == 0) {
            user.checkpoint = block.timestamp;
            emit Newbie(msg.sender);
        }

        (uint256 percent, uint256 profit, uint256 finish) = getResult(plan, msg.value);
        user.deposits.push(Deposit(plan, percent, msg.value, profit, block.timestamp, finish));

        totalStaked = totalStaked.add(msg.value);
        emit NewDeposit(msg.sender, plan, percent, msg.value, profit, block.timestamp, finish);
    }

    function withdraw() public {
        User storage user = users[msg.sender];

        uint256 totalAmount = getUserDividends(msg.sender);
        uint256 fees = totalAmount.mul(WITHDRAW_FEE).div(10000);
           totalAmount = totalAmount.sub(fees);

        uint256 referralBonus = getUserReferralBonus(msg.sender);
        if (referralBonus > 0) {
            user.bonus = 0;
            totalAmount = totalAmount.add(referralBonus);
        }

        require(totalAmount > 0, "User has no dividends");

        uint256 contractBalance = address(this).balance;
        if (contractBalance < totalAmount) {
            totalAmount = contractBalance;
        }

        user.checkpoint = block.timestamp;
        

        msg.sender.transfer(totalAmount);

        emit Withdrawn(msg.sender, totalAmount);

    }

    function getContractBalance() public view returns (uint256) {
        return address(this).balance;
    }

    function getPlanInfo(uint8 plan) public view returns(uint256 time, uint256 percent) {
        time = plans[plan].time;
        percent = plans[plan].percent;
    }

    function getPercent(uint8 plan) public view returns (uint256) {
        if (block.timestamp > startUNIX) {
            return plans[plan].percent.add(PERCENT_STEP.mul(block.timestamp.sub(startUNIX)).div(TIME_STEP));
        } else {
            return plans[plan].percent;
        }
    }

    function getResult(uint8 plan, uint256 deposit) public view returns (uint256 percent, uint256 profit, uint256 finish) {
        percent = getPercent(plan);

        if (plan < 3) {
            profit = deposit.mul(percent).div(PERCENTS_DIVIDER).mul(plans[plan].time);
        } else if (plan < 6) {
            for (uint256 i = 0; i < plans[plan].time; i++) {
                profit = profit.add((deposit.add(profit)).mul(percent).div(PERCENTS_DIVIDER));
            }
        }

        finish = block.timestamp.add(plans[plan].time.mul(TIME_STEP));
    }

    function getUserDividends(address userAddress) public view returns (uint256) {
        User storage user = users[userAddress];

        uint256 totalAmount;

        for (uint256 i = 0; i < user.deposits.length; i++) {
            if (user.checkpoint < user.deposits[i].finish) {
                if (user.deposits[i].plan < 3) {
                    uint256 share = user.deposits[i].amount.mul(user.deposits[i].percent).div(PERCENTS_DIVIDER);
                    uint256 from = user.deposits[i].start > user.checkpoint ? user.deposits[i].start : user.checkpoint;
                    uint256 to = user.deposits[i].finish < block.timestamp ? user.deposits[i].finish : block.timestamp;
                    if (from < to) {
                        totalAmount = totalAmount.add(share.mul(to.sub(from)).div(TIME_STEP));
                    }
                } else if (block.timestamp > user.deposits[i].finish) {
                    totalAmount = totalAmount.add(user.deposits[i].profit);
                }
            }
        }

        return totalAmount;
    }

    function getUserCheckpoint(address userAddress) public view returns(uint256) {
        return users[userAddress].checkpoint;
    }

    function getUserReferrer(address userAddress) public view returns(address) {
        return users[userAddress].referrer;
    }

    function getUserDownlineCount(address userAddress) public view returns(uint256, uint256, uint256) {
        return (users[userAddress].levels[0], users[userAddress].levels[1], users[userAddress].levels[2]);
    }

    function getUserReferralBonus(address userAddress) public view returns(uint256) {
        return users[userAddress].bonus;
    }

    function getUserReferralTotalBonus(address userAddress) public view returns(uint256) {
        return users[userAddress].totalBonus;
    }

    function getUserReferralWithdrawn(address userAddress) public view returns(uint256) {
        return users[userAddress].totalBonus.sub(users[userAddress].bonus);
    }

    function getUserAvailable(address userAddress) public view returns(uint256) {
        return getUserReferralBonus(userAddress).add(getUserDividends(userAddress));
    }

    function getUserAmountOfDeposits(address userAddress) public view returns(uint256) {
        return users[userAddress].deposits.length;
    }

    function getUserTotalDeposits(address userAddress) public view returns(uint256 amount) {
        for (uint256 i = 0; i < users[userAddress].deposits.length; i++) {
            amount = amount.add(users[userAddress].deposits[i].amount);
        }
    }

    function getUserDepositInfo(address userAddress, uint256 index) public view returns(uint8 plan, uint256 percent, uint256 amount, uint256 profit, uint256 start, uint256 finish) {
        User storage user = users[userAddress];

        plan = user.deposits[index].plan;
        percent = user.deposits[index].percent;
        amount = user.deposits[index].amount;
        profit = user.deposits[index].profit;
        start = user.deposits[index].start;
        finish = user.deposits[index].finish;
    }

    function isContract(address addr) internal view returns (bool) {
        uint size;
        assembly { size := extcodesize(addr) }
        return size > 0;
    }
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;

        return c;
    }
}

Answer 1

我想我找到了问题所在。由于我们只处理整数，所以没有双精度类型的变量，在 division 中它四舍五入为 0，然后乘以仍然为 0。

我已将 div 更改为操作的最后一部分。

替换为：

profit = deposit.mul(percent).div(PERCENTS_DIVIDER).mul(plans[plan].time);

对此：

profit = deposit.mul(percent).mul(plans[plan].time).div(PERCENTS_DIVIDER);

为什么 getResults 给我“0”

Why is getResults giving me "0"

solidity