How to Use If else in Assembly.

org 100h

.model small

.stack 100h

.data

  c db ? ; an undefined value

  a db "This is A$"

  b db "This is not A$"

  nl db 0ah,0dh,"$"

 

 

.code

    main proc

       

        ;move data to ds register

        mov dx,@data

        mov ds,dx

       

       

        ;input a char

        mov ah,1   ; use ah,1 for input single char

        int 21h

        mov c,al   ; save that value to c

         

       

        cmp c,'a'  ;compare c variable with char c

        je print   ; if            

        jmp wrongPrint  ;else if

;block

print:

     lea dx,nl

     mov ah,9

     int 21h

   

     lea dx,a

     mov ah,9

     int 21h

     jmp exit ;call exit block

   

wrongPrint:

     

     lea dx,nl

     mov ah,9

     int 21h

     lea dx,b

     mov ah,9

     int 21h

     jmp exit ;call exit block

   

exit:

     mov ah,4ch

     int 21h

    endp      ; end main function

    end main  ;end the file