爲什麼我得到一個錯誤？ （語法錯誤，意想不到的keyword_true）

Question

這是我收到的錯誤：

banking.rb：110：語法錯誤，意想不到的keyword_true，期待 keyword_then或 ';'或 '\ n' 如果transfer_valid = true，那麼 ^ banking.rb：115：警告：沒有別的搶救也沒用

這裏是我的代碼：

#---------------BANK ACCOUNT CLASS---------------# 
class BankAccount 
    def initialize(name, balance=1000, status="open") 
    @name=name 
    @balance=balance 
    @status=status 
    end 

#Change name 
    def name=(name) 
    @name=name 
    end 

#Returns account name 
    def name 
    @name 
    end 

#Sets account status 
    def status=(status) 
    @status=status 
    end 

#Method lets you deposit money to account 
    def deposit(amount) 
    @balance+=amount.to_i 
    end 

#Method lets you set your balance 
    def balance=(balance) 
    @balance=balance 
    end 

#Returns your balance 
    def balance 
    @balance 
    end 

#Method displays the balance 
    def display_balance 
    return "Your Balance is $#{@balance}." 
    end 

#Method checks if account is valid 
    def valid? 
    if balance>0 and status=="open" then 
     return true 
    else 
     return false 
    end 
    end 

#Method closes the account 
    def close_account 
    @status="closed" 
    end 

#Method returns the status of the account 
    def status 
    return "@status"  
    end 

#---------------TRANSFER CLASS---------------# 
class Transfer 
    def initialize(sender, receiver, funds) 
    @sender=sender 
    @receiver=receiver 
    @funds=funds 
    @status="pending" 

#WILL NEED TO FIGURE OUT A WAY FOR IT TO WORK FOR EVERY ACCOUNT 
    @sender_funds=sender_account_name.balance 
    @sender_account_status=sender_account_name.status 

    @receiver_funds=receiver_account_name.funds 
    @receiver_account_status=receiver_account_name.status 
    end 

#Returns sender account name 
    def sender 
    @sender 
    end 

#Change receiver 
    def receiver=(receiver) 
    @receiver=receiver 
    end 

#Returns receiver account name 
    def receiver 
    @receiver 
    end 

#Returns tranfer status 
    def status 
    @status 
    end 

#Returns if accounts are valid for transfer 
    def transfer_valid? 
    if @sender_account_status=="open" && @receiver_account_status=="open" && @sender_funds-@funds>=0 
     return true 
    else 
     return false 
    end 
    end 

#Transfers the money 
    def transfer 
    if transfer_valid?=true then 
     @receiver_funds+=@funds 
     @sender_funds-=@funds 
    else 
     @status="failed" 
    end 
    end 

#Returns sender account funds after transfer 
    def sender_funds_after_transfer 
    @sender_funds 
    end 
#Returns receiver account funds after transfer 
    def receiver_funds_after_transfer 
    @receiver_funds 
    end 
end 


#------------FOR TEST-------------# 
puts "Enter the sender_account_name" 
sender_account_name=gets.chomp.lowcase 
sender_account_name=BankAccount.new(sender_account_name) 

puts "Enter the receiver_account_name" 
receiver_account_name=gets.chomp.lowcase 
receiver_account_name=BankAccount.new(receiver_account_name) 

puts "Sender has #{sender_account_name.balance}$ in his account." 
puts "Receiver has #{receiver_account_name.balance}$ in his account." 

#Makes the transfer 
first_transfer=Transfers.new(sender_account_name, receiver_account_name, 20) 

#Return account funds 
puts "Sender has #{sender_account_name.sender_funds_after_transfer}$ in his account." 
puts "Receiver has #{receiver_account_name.receiver_funds_after_transfer}$ in his account." 

我可能會調用方法不正確。我是新來的班級，所以我不完全知道我該怎麼做。

非常感謝您的回答和幫助。

Answer 1

if transfer_valid?=true then 

變化

if transfer_valid?