在計算和使用燃氣時使用函數

Question

爲什麼下面不起作用？

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

雖然這是工作：

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

您的代碼應該按預期工作，因爲有沒有搞錯。 確保您的limitTransactionCosts具有有效的返回類型（int/float）。 請添加功能代碼進一步分析。

Answer 2

發現我的錯誤。無論limitTransactionCosts如何，我都會發送交易費用和獎勵。

我的代碼知道是這樣的：

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

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

    uint receiverMoney = msg.value - transactionCosts;