如果要将特定数量的值出列，可以使用循环：

If you want to dequeue a specific number of values, you can use a loop:

int count_to_dequeue = 3; // choose a number
while (count_to_dequeue > 0) {
    queue.dequeue();
    count_to_dequeue--;
}

如何工作：首先，初始化变量 count_to_dequeue 。在示例中，它是 3 ，以使三个值出列。然后有一个while循环。这意味着当count_to_dequeue大于零时，执行块中的代码。在块中，一个值出列并且count_to_dequeue减少一个。



运行时发生的所有步骤的完整列表：

How this works: first, you initialize a variable count_to_dequeue. In the example, it's 3, to dequeue three values. Then there is a while loop. It means "while count_to_dequeue is greater than zero, execute the code in the block". In the block, a value is dequeued and count_to_dequeue is decreased by one.

Full list of all steps that happen on runtime:

1. count_to_dequeue设置为3.
2. （进入循环时）
3. 值已出列。
4. count_to_dequeue减少 - >它的值为2.
5. 一个值出列。
6. count_to_dequeue减少 - >它的值为1.
7. 一个值出列。
8. count_to_dequeue减少 - >它的值为0.
9. （while循环存在：count_to_dequeue不再大于零）