Answer:
section .data
prompt db "Enter a number: ", 0
result db "Result: ", 0
formatin db "%d", 0
formatout db "%d", 10, 0
section .bss
num resd 1
section .text
global _start
_start:
; Display prompt
mov eax, 4
mov ebx, 1
mov ecx, prompt
mov edx, 15
int 0x80
; Read integer from standard input
mov eax, 3
mov ebx, 0
mov ecx, num
mov edx, 4
int 0x80
; Multiply by 2
mov eax, [num]
add eax, eax
mov [num], eax
; Display result
mov eax, 4
mov ebx, 1
mov ecx, result
mov edx, 8
int 0x80
mov eax, 4
mov ebx, 1
mov ecx, [num]
mov edx, 4
int 0x80
; Exit program
mov eax, 1
xor ebx, ebx
int 0x80
Step-by-step explanation:
Here's how the code works:
The code defines several data sections, including a prompt string, a result string, and a space in memory to store the input integer.
The _start label indicates the beginning of the program.
The program displays the prompt string to ask the user to input a number.
The program reads the integer from standard input and stores it in the num memory location.
The program multiplies the integer by 2 by adding it to itself.
The program displays the result string and the multiplied integer to standard output.
The program exits.