x86 Assembly Data Types
x86 data types is a little bit different from MIPS assembly data type explained previously. 8086 data types have similar functionality but they are a little bit different in syntax.
These variable types are explained below:
See the table for the list of data type 8086 architecture offers.
|DT||Define Ten Byte|
In addition to these data types, there is variable representation against each data type.
Variable Types in 8086 Assembly
Variable play same role in assembly language as in high-level languages. Each variable has a data type and assigned a space in memory. Variable types in x86 are explained below:
Byte Variable in x86
|DECIMAL RANGE FOR BYTE VARIABLE|
|Signed Interpretation||-128 to 127|
|Unsigned Interpretation||0 to 255|
Byte variable has the following general form:
name DB initial_value
We have a variable name, DB stands for “Define Byte” and an initial value of a variable. See the example below in which a byte variable is initialized.
variable1 DB 23
In the above example, the variable name is “varibale1” and its value is “23”. when you only need to declare a variable use a question mark(?) instead of a value.
variable DB ?
Word Variable in x86
|DECIMAL RANGE FOR WORD VARIABLE|
|Signed Interpretation||-32768 to 32767|
|Unsigned Interpretation||0 to 65535|
DW is used for a word variable. Its Basic form is as follows:
name DW initial_value
It is 32 bit so you can also use signed value as given below:
variable DW -23
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