e have already discussed that the data definition directives to the assembler are used for allocating storage for variables. The variable could also be initialized with some specific value. The initialized value could be specified in hexadecimal, decimal or binary form. For example, we can define a word variable months in either of the following way: MONTHS DW 12 OCH 0110B ΜΟΝTHS DW MONTHS DW The data definition directives can also be used for defining a one dimensional array. Let us define a one dimensional array of numbers. NUMBERS DW 34, 45, 56, 67, 75, 89 The above definition declares an array of six words each initialized with the numbers 34, 45, 56, 67, 75, 89. This allocates 2x6 = 12 bytes of consecutive memory space. The symbolic address of the first number will be NUMBERS and that of the second number will be NUMBERS + 2 and so on. Let us take up another example. You can define an array named inventory of size 8, and initialize all the values with zero, as: INVENTORY DW DW DW DW DW DW DW DW Which, can be abbreviated as: INVENTORY DW 0, 0 , 0,0,0,0, 0, 0 The TIMES directive can also be used for multiple initializations to the same value. Using TIMES, the INVENTORY array can be defined as INVENTORY TIMES 8 DW O
e have already discussed that the data definition directives to the assembler are used for allocating storage for variables. The variable could also be initialized with some specific value. The initialized value could be specified in hexadecimal, decimal or binary form. For example, we can define a word variable months in either of the following way: MONTHS DW 12 OCH 0110B ΜΟΝTHS DW MONTHS DW The data definition directives can also be used for defining a one dimensional array. Let us define a one dimensional array of numbers. NUMBERS DW 34, 45, 56, 67, 75, 89 The above definition declares an array of six words each initialized with the numbers 34, 45, 56, 67, 75, 89. This allocates 2x6 = 12 bytes of consecutive memory space. The symbolic address of the first number will be NUMBERS and that of the second number will be NUMBERS + 2 and so on. Let us take up another example. You can define an array named inventory of size 8, and initialize all the values with zero, as: INVENTORY DW DW DW DW DW DW DW DW Which, can be abbreviated as: INVENTORY DW 0, 0 , 0,0,0,0, 0, 0 The TIMES directive can also be used for multiple initializations to the same value. Using TIMES, the INVENTORY array can be defined as INVENTORY TIMES 8 DW O
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:e have already discussed that the data definition directives to the assembler are used for allocating
storage for variables. The variable could also be initialized with some specific value. The initialized value could be
specified in hexadecimal, decimal or binary form.
For example, we can define a word variable months in either of the following way:
ΜΟΝΤHS
DW
12
MONTHS
DW
OCH
MONTHS
DW
0110B
The data definition directives can also be used for defining a one dimensional array. Let us define a one
dimensional array of numbers.
NUMBERS
DW
34,
45,
56,
67,
75, 89
The above definition declares an array of six words each initialized with the numbers 34, 45, 56, 67, 75, 89. This
allocates 2x6 = 12 bytes of consecutive memory space. The symbolic address of the first number will be
NUMBERS and that of the second number will be NUMBERS + 2 and so on.
Let us take up another example. You can define an array named inventory of size 8, and initialize all the values
with zero, as:
INVENTORY
DW
DW
DW
DW
DW
DW
DW
DW
Which, can be abbreviated as:
INVENTORY
DW 0, 0, 0, 0, 0 ,0,0, 0
The TIMES directive can also be used for multiple initializations to the same value. Using TIMES, the
INVENTORY array can be defined as
INVENTORY TIMES 8 DW O
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