.386
.model flat,stdcall
option casemap:none
 
include     \masm32\include\windows.inc
include     \masm32\include\kernel32.inc
include     \masm32\include\msvcrt.inc
 
includelib  \masm32\lib\kernel32.lib
includelib  \masm32\lib\msvcrt.lib
includelib  \masm32\lib\windows.lib
 
system PROTO C, :PTR BYTE
 
.data
 
hola1 db "por favor digite un numero:",0
hola2 db "por favor digite otro numero:",0
pedir db "%d",0
 
menu1 db "escoja 1 para sumar 2 resta 3 multiplicar 4 para dividir",0
command BYTE "echo; & pause",0
limpiar BYTE "cls",0
 
resultado db "%d",0
 
.data?
x dd ?
x2 dd ?
x3 dd ?
menu dd ?
 
 
.code
start:
invoke system,ADDR limpiar
invoke crt_printf,ADDR hola1
invoke crt_scanf,ADDR pedir,ADDR x
 
invoke crt_printf,ADDR hola2
invoke crt_scanf,ADDR pedir,ADDR x2
 
mov eax,x
mov ebx,x2
 
invoke crt_printf,ADDR menu1
invoke crt_scanf,ADDR pedir,ADDR menu
 
cmp menu,1
je suma
 
cmp menu,2
je resta
 
cmp menu,3
je multiplicacion
 
cmp menu,4
je division
 
 
 
jmp start
invoke ExitProcess,0
 
suma:
add eax,ebx
invoke crt_printf,ADDR resultado,eax
invoke system,ADDR command
jmp start
 
 
resta:
SUB eax,ebx
invoke crt_printf,ADDR resultado,eax
invoke system,ADDR command
jmp start
 
multiplicacion:
mul ebx
invoke crt_printf,ADDR resultado,eax
invoke system,ADDR command
jmp start
 
division:
sub edx,edx
div ebx
invoke crt_printf,ADDR resultado,eax
invoke system,ADDR command
jmp start
 
 
end start

import binascii
 
cadena="soy una cadena en un fichero binario"
codigo=binascii.hexlify(cadena)
print codigo
print binascii.unhexlify(codigo)