A convenient way to find a free port is to pass in a null address, which automatically binds the socket to the local host address and USES a free ephemeral port.
找到空闲端口的便利方法是传递一个null地址，它会自动将套接字绑定到本地主机地址，并使用空闲的临时端口。
For example, if email address is null or only contains Spaces, the message "Enter your email" will be shown when the form is validated.
例如，如果email地址为空，或者只包含空格字符，那么在对表单进行验证时就会显示“Enteryour email”消息。
Data type specification: the ability to tell the UI to display the data at a given address as a specific data type - for example, this address represents the start of a null-terminated string.
数据类型规范：能够通知ui将特定地址的数据显示为具体的数据类型。例如，此地址表示以null结尾的字符串的开始。
Are these null Pointers, or are they Pointers to address 0?
这些是空指针，还是指针地址0 ？
Are these null Pointers, or are they Pointers to address 0?
这些是空指针，还是指针地址0 ？
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