Question

The following algorithm can be used to carry out multiplication of M and N by repeated addition:

initialize product to 0
REPEAT
add M to product
decrement N
UNTIL N == 0

Use this algorithm to multiply the contents of %ax by the contents of %bx and store the product in %dx.

Answer 1

.model small                  
.code                      
mov dx, 00h
mov ax, 02h
mov bx, 04h

lp:
cmp bx, 00h ; compare bx with 0
jbe final ; jump if bx is below or equal to 0
add dx, ax ; else dx <- dx+ax
sub bx, 01h ; bx<-bx-1

final:
mov ah,4ch
int 21H
end ; end of program