Question

NASM ASSEMBLY WINDOWS DOSBOX:

5) Write assembly program that asks the user to enter a number ( the user should input any integer number, say N), then the program outputs N if N is even; or N+3 if N is odd ( note: the output is always even) Example: Enter any number: 25 Even output is: 28 Another example: Enter any number: 32 Even output is: 32.

Answer 1

.LC0:
.string "Enter any number: "
.LC1:
.string "%d"
.LC2:
.string "Even output is: %d"
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov edi, OFFSET FLAT:.LC0
mov eax, 0
call printf
lea rax, [rbp-4]
mov rsi, rax
mov edi, OFFSET FLAT:.LC1
mov eax, 0
call __isoc99_scanf
mov eax, DWORD PTR [rbp-4]
and eax, 1
test eax, eax
jne .L2
mov eax, DWORD PTR [rbp-4]
mov esi, eax
mov edi, OFFSET FLAT:.LC2
mov eax, 0
call printf
jmp .L3
.L2:
mov eax, DWORD PTR [rbp-4]
add eax, 3
mov esi, eax
mov edi, OFFSET FLAT:.LC2
mov eax, 0
call printf
.L3:
mov eax, 0
leave
ret