Assembly Language Program To Read A String And Display

Posted By admin On 17.08.21
Assembly language comment begins with a semicolon (;). It may contain any printable character including blank. It can appear on a line by itself, like −; This program displays a message on screen or, on the same line along with an instruction, like −. Add eax, ebx; adds ebx to eax Assembly Language Statements. We specify the character to be displayed. This is done by storing the character’s ASCII code in a specific 8086 register. In this case we use the dl register, i.e. We use dl to pass a parameter to the output subprogram.
Assembly Language Program To Read A String And Display Key
Assembly Language Program To Read A String And Display The Image
Write an Assembly Language Program to Display a String

Object:

Write an Assembly Language Program to Display a String / Text / Hello World.
Code:

.MODEL SMALL
.STACK 64
.DATA
MSG DB ‘Welcome to codeboks.com’,’$’
.CODE
MAIN PROC FAR
MOV AX,@DATA
MOV DS,AX
CALL D
MOV AH,4CH
INT 21H
MAIN ENDP
D PROC
MOV AH,09
MOV DX,OFFSET MSG
INT 21H
RET
D ENDP
END MAIN
</div><table><tbody><tr><td><div><div>2</div><div>4</div><div>6</div><div>8</div><div>10</div><div>12</div><div>14</div><div>16</div><div>18</div><div>20</div><div>22</div><div>24</div></div></td><td><div><div><span>.</span><span>STACK</span><span>64</span></div><div><span>MSG </span><span>DB</span><span>'Welcome to codeboks.com'</span><span>,</span><span>'$'</span></div><div><span>.</span><span>CODE</span></div><div><span>MAIN </span><span>PROC </span><span>FAR</span></div><div><span>MOV </span><span>AX</span><span>,</span><span>@</span><span>DATA</span></div><div><span>CALL</span><span>D</span></div><div><span>INT</span><span>21H</span></div><div><span>MAIN </span><span>ENDP</span></div><div><span>D</span><span>PROC</span></div><div><span>MOV </span><span>DX</span><span>,</span><span>OFFSET </span><span>MSG</span></div><div><span>RET</span></div><div><span>END </span><span>MAIN</span></div></div></td></tr></tbody></table><h2><span>Command Prompt:</span></h2><h2><span>DOSBOX:</span></h2><h2><span><br /></span><b><span>Character Output</span></b></h2><span><br /></span><br><div><span>The task here is to display a single character on the screen. There are three elements involved in carrying out this operation using the int instruction:</span></div><span><br /></span><br><div><span>1. We specify the character to be displayed. This is done by storing the character’s ASCII code in a specific 8086 register. In this case we use the <b>dl</b> register, i.e. we use dl to pass a parameter to the output subprogram.</span></div><span><br /></span><br><div><span>2. We specify which of MS-DOS’s I/O subprograms we wish to use. The subprogram to display a character is subprogram number <b>2h</b>. This number is stored in the ah register.</span></div><span><br /></span><br><div><span>3. We request MS-DOS to carry out the I/O operation using the int instruction. This means that we <b>interrupt</b> our program and transfer control to the MS-DOS subprogram that we have specified using the ah register.</span></div><span><br /></span><br><div><span><br /></span></div><br><div><span><b>Example 1: </b>Write a code fragment to display the character ’a’ on the screen:</span></div><span><br />mov dl, ‘a‘ ; dl = ‘a‘</span><br><span>mov ah, 2h ; character output subprogram<br />int 21h ; call ms-dos output character</span><br><div><span>As you can see, this simple task is quite complicated in assembly language.</span></div><br><div><span><br /></span></div><div>The task here is to read a single character from the keyboard. There are also three elements involved in performing character input:</div><br><div><span>1. As for character input, we specify which of MS-DOS’s I/O subprograms we wish to use, i.e. the character input from the keyboard subprogram. This is MS-DOS subprogram number <b>1h</b>. This number must be stored in the ah register.</span></div><span><br /></span><br><div><span>2. We call MS-DOS to carry out the I/O operation using the int instruction as for character input.</span></div><span><br /></span><br><div><span>3. The MS-DOS subprogram uses the al register to store the character it reads from the keyboard.</span></div><span><br /></span><img src='https://image.slidesharecdn.com/session3and4programs-130501053524-phpapp01/95/ignou-assembly-language-programming-1-638.jpg?cb=1543065023' alt='Assembly Language Program To Read A String And Display' title='Assembly Language Program To Read A String And Display' /><br><div><span><b>Example 2: </b>Write a code fragment to read a character from the keyboard:</span></div><br><div><span><br /></span><span>mov ah, 1h ; keyboard input subprogram</span></div><span>int 21h; character input<br />; character is stored in al<br />mov c, al ; copy character from al to c</span><br><div><span>The following example combines the two previous ones, by reading a character from the keyboard and displaying it.</span></div><div><b><br /></b><b>Example 3: </b>Reading and displaying a character:</div><div><br />mov ah, 1h ; keyboard input subprogram</div>int 21h ; read character into al<br />mov dl, al ; copy character to dl<br />mov ah, 2h ; character output subprogram<img src='https://samsclass.info/127/proj/p12-64asm26.png' alt='Assembly Language Program To Read A String And Display' title='Assembly Language Program To Read A String And Display' /><br />int 21h ; display character in dl<br><h2><span><b>String output</b></span></h2><br /><span><br /></span><span><br /></span><br /><div><span>The task here is to display a string(Array of characters) on the screen. There are four elements involved in carrying out this operation using the INT instruction:</span></div><div><span><br /></span><span>1.Under the data segment, we define a variable to serve as the starting address for the string, array of characters or ASCII codes ending with '$'.</span><br /><span>e.g message DB 'Your text goes here','$'</span><br /><span>OR message DB 'Y','o','u','r',' ','t','e','x','t',' ','g','o','e','s',' ','h','e','r','e','$' ;Pretty long huh?</span><br /><span>OR message DB 89,111,117,114, ... ,$ ;In ASCII codes.</span><br /><span>where</span><br /><span> message is the name of the variable,</span><br /><span> DB means 'Define byte',</span><br /><span> '$' indicates end of string, and </span><br /><span> the digits are the ASCII code of the characters.</span><br /><span><br /></span><span><br /></span><span>2. Under the code segment(also explained in next post), enter</span><br /><span>MOV AX, @data</span><br /><span>MOV DS, AX</span><br />to initialize the DS register</div><div><br /><span>This moves the address of your data in memory to register DS.</span><br /><span>then, offset the variable to DX for display</span><br /><span>i.e MOV DX, OFFSET message </span><br /><span><br /></span></div><div><span>3. We specify which of MS-DOS’s I/O subprograms we wish to use. The subprogram to display a string is subprogram number <b>9</b><b>h</b>. This number is stored in the ah register.</span></div><div><span>4. We request MS-DOS to carry out the I/O operation using the int instruction. This means that we <b>interrupt</b> our program and transfer control to the MS-DOS subprogram that we have specified using the ah register.</span></div><span><br /></span><span>Example 4</span><br /><span>.data</span><br /><img src='https://i.ytimg.com/vi/l3IN82jLRGI/maxresdefault.jpg' alt='Program' title='Program' /><span>notice DB 'Hello world',13,10,'$'</span><br /><span>.code</span><br /><span>start: MOV AX, @data</span><br /><span> MOV DS, AX</span><br /><span><br /> MOV DX, offset notice ;Copies notice address to DX for display</span><br /><span> MOV AH, 09H</span><br /><span> INT 21H ;Calls MS-DOS to display string</span><br /><span><br /> MOV AH, 4C00H ;Returns control to MS-DOS</span><br /><span> INT 21H</span><br /><span>END start</span><br /><span><br /></span><br /><h2><span>String input</span></h2><br /><div><span>The task here is to input a string(Array of characters) from the keyboard. There are four elements involved in carrying out this operation using the int instruction:</span></div><div><span><br /></span><span>1.Under the data segment, we define the variable to contain the string.</span><br /><span>e.g message DB ?</span><br /><span>where</span><br /><span> message is the name of the variable,</span><br /><span> DB means 'Define byte',</span><br /> ? indicates the memory created should be empty.<br /><span><br /></span><span>2. Under the code segment(also explained in next post), enter</span><br /><span>MOV AX, @data</span><br /><span>MOV DS, AX</span><br /><span>to initialize the DS register</span><br /><span><br />This moves the address of your data in memory to register DS.</span><br /><span>then, offset the variable to DX</span><br /><span>i.e MOV DX, OFFSET message </span><br /><span><br /></span></div><div><span>3. We specify which of MS-DOS’s I/O subprograms we wish to use. The subprogram to display a string is subprogram number <b>3FH</b>. This number is stored in the ah register.</span></div><div><span>4. We request MS-DOS to carry out the I/O operation using the int instruction. This means that we <b>interrupt</b> our program and transfer control to the MS-DOS subprogram that we have specified using the ah register.</span></div><span><br /></span><span>Example 4</span><br /><span>.data</span><br /><span><span> valu</span>e DB ?</span><br /><span>.code</span><br /><span>start: MOV AX, @data</span><br /><span> MOV DS, AX</span><br /><span><br /> MOV DX, OFFSET value ;Copies notice address to DX for display</span><br /><h3 id='assembly-language-program-to-read-a-string-and-display-key'>Assembly Language Program To Read A String And Display Key</h3><span> MOV AH, 3FH</span><br /><span> INT 21H ;Calls MS-DOS to input string</span><br /><span><br /> MOV AH, 4C00H ;Returns control to MS-DOS</span><br /><span> INT 21H</span><br /><span>END start ;End of program.</span><br /><span>;The program will simply prompt you to enter a string and exits.</span><h3 id='assembly-language-program-to-read-a-string-and-display-the-image'>Assembly Language Program To Read A String And Display The Image</h3><img src='https://venturebeat.com/wp-content/uploads/2018/11/IMG_20181127_045154.jpg?w=800' alt='Language' title='Language' /><br /><span>;The string will be stored in memory starting from the address of the variable you declared(value).</span><br /><span>;Note: in this case, CARRIAGE-RETURN (ASCII code 13) or LINE-FEED (ASCII code 10) indicates the end of the string.</span><br /><span><br /></span><br /><div><span>References:</span></div><div><span><span>1. 'Character output' retrieved from </span>http://www.csi.ucd.ie</span><br /><span>2. 'Character input' retrieved from http://www.csi.ucd.ie</span></div></p>
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