汇编语言数据库问题 [英] Assembly Language DB Question

问题描述

最近，我一直在学习某种汇编语言，我对汇编应用程序.Data段上的DB声明有疑问.

直到现在，我总是这样声明一个字节:

Hi,

Lately I have been Studying some Assembly language, I have a question about the DB Decleration on the .Data Segment of an Assembly Application.

Till Now, I always declared a Byte by doing So:

Number db "Please enter a number : ",0

(名称)db(字符串)，0

今天，我找到了一个具有如下字符串声明的示例:

(Name) db (String), 0

Today, I found an example which had the String Declaration as Follows:

Hello db "Hello World!",13,10, 0

我对13、10有疑问.

谁能指出这些意思.

谢谢

安德鲁·伯格(Andrew Borg)

I Have a Question Regarding the 13, 10.

Can anybody point out what these mean.

Thank You,

Andrew Borg

推荐答案

:笑:
它们是添加到字符串末尾的字节值，无法通过常规键入添加.在这种情况下，回车符，换行符和终止的空字符.
在C型语言中，这相当于写作:

:laugh:
They are bytes values added to the end of the string, that cannot be added by normal typing. In this case a carriage return, a line feed and a terminating null character.
In C-type languages, this would be the equivalent of writing:

char* Hello = "Hello World!\n";

不过，最好将它们声明为助记符，因此您可以使用可读的名称代替数字:

It is a good idea to declare these as mnemonics though, so you can use readable names instead of numbers:

Hello db "Hello World!", AS_CR, AS_LF, 0

(我可能不会将AS_NULL用作零，因为它很可能是字符串终止符，而不是一个要显示的字符)

(I probably wouldn''t use AS_NULL for the zero, as it would most likely be a string terminator, rather than a character to display)

它们表示CR LF，Carriage_Return(13)，Line_Feed(10).对于Microsoft系统，这两个字节一起以ASCII(或每个字符一个字节)编码定义了标准的行尾定界符.

(通常，行尾定界符取决于平台；并且这一事实曾经是造成众多混乱的根源，这种混乱并不经常出现，但有时甚至是最近.)

—SA

They mean CR LF, Carriage_Return (13), Line_Feed (10). These two bytes together define standard end-of-line delimiter in ASCII (or any one-byte-per-character encodings) in case of Microsoft systems.

(Generally, the end-of-line delimiter is platform-dependent; and this fact used to be a source on numerous confusions, which appear not often, but from time to time even these days.)

—SA

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