Question

3. Write a program in assembly language that reads a number from the keyboard and displays it on the screen.

4. Write a program in assembly language to ask two digits from the user, store the digits in the EAX and EBX register, respectively, add the values, store the result in a memory location 'res' and finally display the result.

Answer 1

3)

section .text

global _start

_start:

mov ecx, msg
mov edx, msg_len
mov ebx, 1
mov eax, 4
int 0x80
  
mov eax,3
mov ebx,0
mov ecx,sum
int 80h

mov ecx, res_prompt
mov edx, res_len
mov ebx, 1
mov eax, 4
int 0x80

mov ecx, sum
mov edx, 2
mov ebx, 1
mov eax, 4
int 0x80

mov eax, 1
int 0x80

section .data
msg db "Enter a number ", 0xA
msg_len equ $ - msg

res_prompt db "The input number is "
res_len equ $ - res_prompt

segment .bss
sum resb 2

Output :-

4)

section .text

global _start

_start:

mov ecx, msg
mov edx, msg_len
mov ebx, 1
mov eax, 4
int 0x80
  
mov eax,3
mov ebx,0   
mov ecx,dig_1
mov edx,2
int 80h

mov ecx, msg
mov edx, msg_len
mov ebx, 1
mov eax, 4
int 0x80
  
mov eax,3
mov ebx,0   
mov ecx,dig_2
mov edx,2
int 80h

mov ecx, res_prompt
mov edx, res_len
mov ebx, 1
mov eax, 4
int 0x80

mov eax, [dig_1]
sub eax, '0'
mov ebx, [dig_2]
sub ebx, '0'

add eax, ebx
add eax, '0'

mov [res],eax

mov ecx, res
mov edx, 1
mov ebx, 1
mov eax, 4
int 0x80

mov eax, 1
int 0x80

section .data
msg db "Enter a digit ", 0xA,0xD
msg_len equ $ - msg

res_prompt db "The sum of two digits is "
res_len equ $ - res_prompt

segment .bss
dig_1 resb 2
dig_2 resb 2
res resb 1

Output :-