Write a program in assembly language that asks the user for

Write a program in assembly language that asks the user for two integers and calculates their product. You can only use shift, add or sub instructions to calculate the multiplication (not the mult instruction)

Solution

.model small

.data                                                                  

a db 09H

b db 02H

.code

      mov      ax, @data          

      mov      ds, ax

      mov      ah, 0

      mov      al, a                 

      mov      bl, b                 

      mul      bl                 

      mov      ch, 04h            

      mov      cl, 04h           

      mov      bx, ax             

l2:     rol      bx, cl             

      mov      dl, bl            

      and      dl, 0fH           

      cmp      dl, 09           

      jbe      l4

      add      dl, 07            

l4:     add      dl, 30H

      mov      ah, 02          

      int      21H

      dec      ch                 

      jnz      l2

      mov      ah, 4cH      

      int      21H

      end