Answer to Question #177281 in Assembler for Kent

Question #177281

Write an assembly language program that moves the number 2 to BL and 0 to AL. Add BL to AL ECX many times having AL as the destination. Move 10 into ECX before the loop. What will the value of AL when the loop is done?


1
Expert's answer
2021-03-31T15:40:48-0400

global _start


section .data

   str:   DB 30,30,30,10   

   strLen:   EQU $-str


section .text


_start:

   mov   bl,2   ; move the number 2 to BL

   xor   al,al   ; move 0 to AL


   mov   ecx,10

M1:   add   al,bl   ; Add BL to AL

   loop   M1   ; loop ECX many times


   ; convert byte AL to decimal string

   mov   ecx, str


   ; first decimal digit

   xor   ah,ah

   mov   bl,100

   div   bl

   add   al,30h

   mov   [ecx],al


   ; second decimal digit   

   inc   ecx

   mov   al,ah

   xor   ah,ah

   mov   bl,10

   div   bl

   add   al,30h

   mov   [ecx],al


   ; third decimal digit   

   inc   ecx

   mov   al,ah

   add   al,30h

   mov   [ecx],al


   ; output result in AL

   mov   eax, 4

   mov   ebx, 1

   mov   ecx, str

   mov   edx, strLen

   int   80h


   ; exit

   mov   eax, 1

   mov   ebx, 0

   int   80h


; Answer: AL=20





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