Starter at assembly : add 2 numbers

[irnix]

How do i add 2 numbers in assembly. i tried something like this

Code Select Expand


.386
.model flat,stdcall
option casemap:none

.data
      db msg "Result is: ",0
.code
start :
      mov eax,200
      add eax,200
      add eax,400
      sub eax,100

    invoke StdOut msg,0

end start


Still getting some errors, how do i go from there?

[hutch--]

OK, you are not including any system files so you can do it a number of ways,

Add this line at the top.

include \masm32\include\masm32rt.inc


This means you can remove the following as the runtime INCLUDE file already has them but more importantly you can now use the Windows API functions and the MASM32 library with its macro support.

.386
.model flat,stdcall
option casemap:none


The following has added a bit to your code but your mnemonics were done correctly.


include \masm32\include\masm32rt.inc

.data
      msg db "Result is: ",0
      lf  db 13,10,13,10,0
      buffer db 64 dup (0)      ; 64 byte bufffer
      pbuf dd buffer            ; pointer to buffer
.code

start:

    mov eax,200
    add eax,200
    add eax,400
    sub eax,100

    mov pbuf, ustr$(eax)        ; convert EAX result to string

    invoke StdOut,OFFSET msg    ; display your text mesage
    invoke StdOut,pbuf          ; display the result
    invoke StdOut,OFFSET lf     ; append the 2 line feeds so it displays OK

    inkey
    exit

end start

[Vortex]

Hi irnix,

Code Select Expand

include     \masm32\include\masm32rt.inc

.data

msg         db 'Result is: %d',0

.code

start:

    mov     eax,200
    add     eax,200
    add     eax,400
    sub     eax,100

    invoke  crt_printf,ADDR msg,eax

    invoke  ExitProcess,0

END start