在计算和使用燃气时使用函数

Question

为什么下面不起作用？

uint transactionFee = (msg.value * 2)/100; 
uint transactionReward = (msg.value * 2)/100; 
uint receiverMoney = msg.value - limitTransactionCosts(transactionFee - transactionReward); 

The contract won't allow this transaction to be executed

虽然这是工作：

uint transactionFee = (msg.value * 2)/100; 
uint transactionReward = (msg.value * 2)/100; 
transactionFee = limitTransactionCosts(transactionFee); 
transactionReward = limitTransactionCosts(transactionReward); 

uint receiverMoney = msg.value - transactionFee - transactionReward; 

50.002 Gas

Answer 1

您的代码应该按预期工作，因为有没有搞错。 确保您的limitTransactionCosts具有有效的返回类型（int/float）。 请添加功能代码进一步分析。

Answer 2

发现我的错误。无论limitTransactionCosts如何，我都会发送交易费用和奖励。

我的代码知道是这样的：

// Calculate costs 
    uint transactionCosts = (msg.value * 4)/1000; 
    transactionCosts = limitTransactionCosts(transactionCosts); 

    uint transactionFee = transactionCosts/2; 
    uint transactionReward = transactionCosts/2; 

    uint receiverMoney = msg.value - transactionCosts;