Unijeti dva broja i znak

; multi-segment executable file template.

data segment
    a db ?
    b db ?
    zn db ?
    rez db ?
    razmak db " ", "$"
    jednako db " = ", "$"
    nr db 10, 13, "$"
    pkey db "press any key...$"
ends

stack segment
    dw   128  dup(0)
ends

code segment
start:
; set segment registers:
    mov ax, data
    mov ds, ax
    mov es, ax

    mov ah,1
    int 21h
    sub al, 48
    mov a, al

    int 21h
    sub al, 48
    mov b, al

    int 21h
    mov zn, al

    lea dx, nr
    mov ah, 9
    int 21h


    cmp zn, '+'
    je saberi
    jmp d1

    saberi:
    mov al, a
    add al, b
    mov rez, al
    add rez, 48

    lea dx, nr
    mov ah, 9
    int 21h

    mov dl, a
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, zn
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, b
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, jednako
    mov ah, 9
    int 21h

    mov dl, rez
    mov ah, 2
    int 21h


    jmp kraj

    d1:
    cmp zn, '-'
    je oduzmi
    jmp d2

    oduzmi:
    mov al, a
    sub al, b
    mov rez, al
    add rez, 48

    lea dx, nr
    mov ah, 9
    int 21h

    mov dl, a
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, zn
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, b
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, jednako
    mov ah, 9
    int 21h

    mov dl, rez
    mov ah, 2
    int 21h

    jmp kraj

    d2: cmp zn, '*'
    je pomnozi
    jmp d3

    pomnozi:
    mov al, a
    mul b
    mov bl, 10
    div bl
    mov ch, al
    mov cl, ah

    lea dx, nr
    mov ah, 9
    int 21h

    mov dl, a
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, zn
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, b
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, jednako
    mov ah, 9
    int 21h

    mov dl, ch
    add dl, 48
    mov ah, 2
    int 21h


    mov dl, cl
    add dl, 48
    mov ah, 2
    int 21h

    jmp kraj

    d3: cmp zn, '/'
    je podijeli
    jmp kraj

    podijeli:
    mov al, a
    mov bl, 1
    mul bl

    mov cl, b
    div b
    mov rez, al
    add rez, 48
    lea dx, nr
    mov ah, 9
    int 21h

    mov dl, a
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, zn
    mov ah, 2
    int 21h

    lea dx, razmak
    mov ah, 9
    int 21h

    mov dl, b
    add dl, 48
    mov ah, 2
    int 21h

    lea dx, jednako
    mov ah, 9
    int 21h

    mov dl, rez
    mov ah, 2
    int 21h

    kraj:


    lea dx, pkey
    mov ah, 9
    int 21h        ; output string at ds:dx

    ; wait for any key....
    mov ah, 1
    int 21h

    mov ax, 4c00h ; exit to operating system.
    int 21h
ends

end start ; set entry point and stop the assembler.