OUTDEC PROC
   ; this procedure will display a decimal number
   ; input : AX
   ; output : none
   ; uses : MAIN

   PUSH BX                        ; push BX onto the STACK
   PUSH CX                        ; push CX onto the STACK
   PUSH DX                        ; push DX onto the STACK

   CMP AX, 0                      ; compare AX with 0
   JGE @START                     ; jump to label @START if AX>=0

   PUSH AX                        ; push AX onto the STACK

   MOV AH, 2                      ; set output function
   MOV DL, "-"                    ; set DL='-'
   INT 21H                        ; print the character

   POP AX                         ; pop a value from STACK into AX

   NEG AX                         ; take 2's complement of AX

   @START:                        ; jump label

   XOR CX, CX                     ; clear CX
   MOV BX, 10                     ; set BX=10

   @OUTPUT:                       ; loop label
     XOR DX, DX                   ; clear DX
     DIV BX                       ; divide AX by BX
     PUSH DX                      ; push DX onto the STACK
     INC CX                       ; increment CX
     OR AX, AX                    ; take OR of Ax with AX
   JNE @OUTPUT                    ; jump to label @OUTPUT if ZF=0

   MOV AH, 2                      ; set output function

   @DISPLAY:                      ; loop label
     POP DX                       ; pop a value from STACK to DX
     OR DL, 30H                   ; convert decimal to ascii code
     INT 21H                      ; print a character
   LOOP @DISPLAY                  ; jump to label @DISPLAY if CX!=0

   POP DX                         ; pop a value from STACK into DX
   POP CX                         ; pop a value from STACK into CX
   POP BX                         ; pop a value from STACK into BX

   RET                            ; return control to the calling procedure
 OUTDEC ENDP

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