; res = y1 / y2
; y1 = 12 if x < 12 else x+1
; y2 = 2  if x > 2  else a+x

   .386
   .model flat, stdcall
 option casemap :none   ; case sensitive
 include \masm32\include\windows.inc
 include \masm32\include\kernel32.inc
 include \masm32\include\user32.inc
 include \masm32\include\masm32.inc

 includelib \masm32\lib\kernel32.lib
 includelib \masm32\lib\user32.lib
 includelib \masm32\lib\masm32.lib

.data
    x  db 1
    a  db 2
    y1 dw ?
    y2 dw ?
    res dd ? 	         ; окончательный результат
    dest  db 10 dup (?)
    title_1 db "lab3",0

.code
start:
    cmp x, 12

    ; if x < 12
    jb assign_y1_12
    ; else
    jmp assign_y1_x_plus_1

assign_y1_12:
    mov y1, 12
    jmp done_1

assign_y1_x_plus_1:
    mov al, x
    inc al
    cbw
    mov y1, ax
    jmp done_1

done_1:
    cmp x, 2

    ; if x > 2
    ja assign_y2_2
    ; else
    jmp assign_y2_x_plus_a

assign_y2_2:
    mov y2, 2
    jmp done_2

assign_y2_x_plus_a:
    mov al, x
    cbw
    mov y2, ax
    mov bx, y2
    mov al, a
    cbw
    add bx, ax
    mov y2, bx
    jmp done_2

done_2:
    mov ax, y1
    cwd
    idiv y2
    cwde
    mov res, eax

    invoke dwtoa, res, addr dest

    invoke MessageBox,0,addr dest,addr title_1,MB_OK

    invoke  ExitProcess, 0

    end start