Write a program to Subtract Two 16 Bit Numbers in Assembly language . Program logic should ask for two numbers to be substrated and the should implement required logic to the numbers to get desired output.
Consider that a word of data is present in the AX register and second word of data is present in the BX register.
We have to subtract the word in BX with the word AX. Please find more Assembly language codes on this page.
Using subtract (SUB) instruction, subtract the contents of two registers.
Result will be stored in the AX register.
Display the result using display routine.
AX = 1234 H
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1234 H
|
|
BX = 0100 H
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–
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0100 H
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1134 H
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Algorithm to Subtract Two 16 Bit Numbers :
Step I : Initialize the data segment.
Step II : Get the first number in AX register.
Step III : Get the second number in BX register.
Step IV : Add the two numbers.
Step V : Display the result.
Step VI : Stop
Program to Subtract Two 16 Bit Numbers :
1 |
<span style="font-size: 14pt; font-family: arial, helvetica, sans-serif;"> .model small <br/> .data <br/> a dw 1234H <br/> b dw 0100H <br/> .code <br/> mov ax, @data ; Initialize data section <br/> mov ds, ax <br/> mov ax, a ; Load number1 in ax <br/> mov bx, b ; Load number2 in bx <br/> sub ax, bx ; subtract numbers. Result in ax <br/> mov ch, 04h ; Count of digits to be displayed <br/> mov cl, 04h ; Count to roll by 4 bits <br/> mov bx, ax ; Result in reg bx <br/> l2: rol bx, cl ; roll bl so that msb comes to lsb <br/> mov dl, bl ; load dl with data to be displayed <br/> and dl, 0fH ; get only lsb <br/> cmp dl, 09 ; check if digit is 0-9 or letter A-F <br/> jbe l4 <br/> add dl, 07 ; if letter add 37H else only add 30H <br/> l4: add dl, 30H <br/> mov ah, 02 ; Function 2 under INT 21H (Display character) <br/> int 21H <br/> dec ch ; Decrement Count <br/> jnz l2 <br/> mov ah, 4cH ; Terminate Program <br/> int 21H <br/> end</span> |
How to Run this Program :
For Running this program you should have installed Tasm on you computer . If you have not installed Tasm yet please install from Here .
C:\programs>tasm 16-sub.asm
Turbo Assembler Version 3.0 Copyright (c) 1988, 1991 Borland International
Assembling file: 16-sub.asm
Error messages: None
Warning messages: None
Passes: 1
Remaining memory: 438k
C:\programs>tlink 16-sub.obj
Turbo Link Version 3.0 Copyright (c) 1987, 1990 Borland International
Warning: No stack
C:\programs>16-sub
1134
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