Multiply Two 8 Bit Numbers by Successive Addition Method
Write a Program to Multiply Two 8 Bit Numbers Successive Addition Method in Assembly language . Program should take first number and counter as input for the program and after implementing given below logic it should produce desired result .
Consider that a byte is present in the AL register and second byte is present in the BL register.
We have to multiply the byte in AL with the byte in BL.
We will multiply the numbers using successive addition method.
In successive addition method, one number is accepted and other number is taken as a counter. The first number is added with itself, till the counter decrements to zero.
Result is stored in DX register. Display the result, using display routine.
For example : AL = 12 H, BL = 10 H
Result = 12H + 12H + 12H + 12H + 12H + 12H + 12H + 12H + 12H + 12H
Result = 0120 H
Algorithm to Multiply Two 8 Bit Numbers Successive Addition Method
Step I : Initialize the data segment.
Step II : Get the first number.
Step III : Get the second number as counter.
Step IV : Initialize result = 0.
Step V : Result = Result + First number.
Step VI : Decrement counter
Step VII : If count ¹ 0, go to step V.
Step VIII : Display the result.
Step IX : Stop.
Program to Multiply Two 8 Bit Numbers Successive Addition Method
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.model small <br/> .data <br/> a db 12H <br/> b db 10H <br/> .code <br/> mov ax, @data ; Initialize data section <br/> mov ds, ax <br/> mov al, a ; Load number1 in al <br/> mov bl, b ; Load number2 in bl <br/> mov ah, 0 <br/> mov dx, 0 ; intialize result <br/> ad: add dx, ax ; add numbers. Result in dx <br/> dec bl ; dec number <br/> cmp bl, 0 Flowchart 11 <br/> jnz ad <br/> mov ch, 04h ; Count of digits to be displayed <br/> mov cl, 04h ; Count to roll by 4 bits <br/> mov bx, dx ; 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 |
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 succmul.asm
Turbo Assembler Version 3.0 Copyright (c) 1988, 1991 Borland International
Assembling file: succmul.asm
Error messages: None
Warning messages: None
Passes: 1
Remaining memory: 438k
C:\programs>tlink succmul
Turbo Link Version 3.0 Copyright (c) 1987, 1990 Borland International
Warning: No stack
C:\programs>succmul
0120
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