python

Question

我写了以下代码：

def addInterest(balance, rate):
    newBalance = balance * (1+rate)
    return newBalance


def test():
    amount=1000
    rate=0.05
    addInterest(amount, rate)
    print("" ,amount)

test()

我预计输出为1050，但仍然打印1000.有人能告诉我我做错了什么吗？

Answer 1

您没有从AddInterest分配任何值：

amount = addInterest(amount, rate)

Answer 2

函数addInterest（）返回值1050，但不应用amount变量的更改，因为你没有作为引用变量传递（我认为python doenst支持引用的变量）。您必须将返回的值存储到新变量中：

UILocalNotification* localNotification = [[UILocalNotification alloc] init];

    localNotification.fireDate = [[NSDate date] dateByAddingTimeInterval:100];

     localNotification.timeZone = [NSTimeZone defaultTimeZone];

    localNotification.soundName = UILocalNotificationDefaultSoundName;

    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];