sum.asm

section .data
fmtin: db "%d%d", 0
fmtout: db "%d", 10, 0
section .bss
a: resd 1
b: resd 1
section .text
extern _printf
extern _scanf
global _main
_main:
push b
push a
push fmtin
call _scanf
add esp, 12
mov eax, [a]
add [b], eax
push dword [b]
push fmtout
call _printf
add esp, 8
xor eax, eax
xor ecx, ecx
ret