What does assembly language A DW M mean? How do I store it on my computer?

dw m is to define a variable named a, the value is m, and when it is actually stored, there is only the data m in the corresponding memory area, and there is no name a. The name is equivalent to an offset that describes the property.

2.Define the string, :$ represents the end of the string.

3, es and ds are almost used, but when you use it, you generally need to add the register name, such as es:[di], if you don't add it, [di] will become ds:[di] meaning. ES can be assigned an address value in the same way as DS.

4.What is the difference between a data segment and a stack segment? Think about it: what is the difference between "public infrastructure" and "schools"?

The stack segment itself is a data segment, except that the method of manipulating it is to subtract the top pointer of the stack and add the top pointer of the stack to the stack out of the stack. In the ordinary sense, the data segment is whatever you want......It's like you can't yell at school, but you can yell at KTV.

The two also serve different purposes, and data segments are typically used to store long-term data or specific variables.

Stack segments are generally used to store temporary data and address information (for example, the data used by RET is the top-of-stack data).

But who says it has to be used this way?

DS is used to describe data segments and SS is used to describe stack segments, but sometimes the two can be the same.

Programming languages are dead, people are living ......

A dw m has its corresponding ASCII code, and a corresponds to 65. You'll find out the rest by looking up the ASCII corresponding lookup. Converting the complement to binary means converting the complement and the original code to each other in the computer.

dw is the definition of 2 bytes of space. dw is a pseudo-instruction of the assembly, dw defines the word type variable, a word data occupies 2 byte units, read one, the offset plus 2.

db defines a byte type variable, one byte of data occupies one byte unit, and after reading one, the offset is increased by 1.

dd defines a double-word type variable, a double-word data occupies 4 byte units, and after reading one, the offset is increased by 4.

Assembly instructions neither control nor are assembled into machines**, but can only be identified by the assembler and guide how the assembly is to proceed.

db is a byte.

dw is a word, and a word is two bytes.

It is mainly used to enter data.

For example, DW 28, 47

Define one of the pseudo-directives for commonly used data.

db defines the byte type, dw defines the word type, and dd defines the two-word type.

For details, please refer to the relevant compilation books.

The data definition directive format is as follows:

Format: Symbol name db dw dd df dq dt initial value sequence db defines byte type, dw defines word type, dd defines double word type, df is long word type, dq is four-word type, dt is cross type, this command defines 8-bit, 16-bit, 32-bit, 48-bit, 64-bit, 80-bit data.

dw is the storage space that allocates one word to the data, i.e. 16 bits, for example: array dw 3 dup(1) allocates 3 words to the array array, and the initial value is 1

Define a variable named partn, the type of the variable is word type --- word type (16bit = 2b for 16-bit computers), and no value (?) is assigned to the variableMeaning of expression).

Is there such a command, I don't remember the ring shift instruction having this.

Strings must be stored in db (single-byte order), not dw (double-byte order), and should be separated. Corresponds to low-to-low bytes and high-to-high bytes).

code segment

assume cs:code

org 100h

start:

jmp bbb

nopmsg1 dw 'he','ll','o ','wo','rl','d ',' $'

bbb:push cs

pop ds

lea dx,msg1

mov ah,9

int 21h

mov ah,4ch

int 21h

code ends

end start

The example above outputs "ehll oowlr d" instead of "hello world".

dw defines a (or a continuous number of 16-bit) data in memory (define a word) (in the past, computers were mostly 16 bits long, not 32 or 64 bits now) (which can be understood as a variable in high-level languages).

db 8-bit (define byte).

.n1 dw 1234h

n2 db 12h

.mov ax,n1

mov bh,n2...

1st Floor Lauey Drink Tonight? byte=16bits？ word=32bits？

Please correct.

b, w, and d represent bytes, double bytes, and 4 bytes, respectively.

The prefix is preceded by d, which means data in the assembly, and the formed db, dw, and dd represent single-byte data, double-byte data, and 4-byte data, respectively.

It's just an impression of understanding, not too sure, and I hope to weigh it.

var1 db 00h

Assign a memory cell to the variable var1, with an initial value of 00h (the size of the memory cell is one byte d-date, b-byte) var2 dw 1

Assign a storage unit to the variable var2 with an initial value of 1 (the size of the storage unit is one word d-date, w-word).

DW is double-byteed, and when it is taken out, it is taken 2 bytes in a row

In assembly language, the order in which the db dw instruction input data ab is stored is different.

1、db 'ab'The storage order is a b

2、dw 'ab', the storage order is the low byte first and then the high byte, that is: b a

flag1 storage is 41h 42h

flag2 storage is 42h 41h

Pseudo-directives other than db allow a maximum of two characters to be defined and stored in reverse order in the unit starting with the lower address.

Take a good look at the book yourself, there must be it in the book, and then give a link.