检查数字是否可被2整除，如果是，则打印数字

好吧，这是我的ASM代码的一部分：

    MOV AH, 0 ;reset AH before division
    MOV AL,[myNum] ;move the inputed number to AL
    DIV two ;div 123 / 2;
    CMP AH,0
    JNE inputIsPrime

    ;If 123 % 2 = 0, output 123 / 2.
    DIV ten
    MOV DH,AH

    SUB AL,'0'
    MOV AH,2
    MOV DL, AL
    INT 21h

    MOV divisionCalc,DH

    MOV AH,2
    MOV DL,DH
    INT 21h
    JMP endProg

我要达到的目的是，在键盘上输入“ 60”并按Enter键后，输出错误。我想得到数字“ 30”，因为60/2 =30。如果输入42，我想得到21作为输出。

为什么我的代码失败的任何想法？

这是完整的代码：

.MODEL SMALL
.STACK 100h
.DATA

DisplayString DB 'Enter number up to 120:', 13,10,'$'
isPrimeNum DB 'is prime', 13,10,'$'
    goodMSG DB 'good', 13,10,'$'
        badMSG DB 'bad', 13,10,'$'
divisionCalc DB ?
myNum DB ?
two DB 2
three DB 3
five DB 5
seven DB 7
ten DB 10
eleven DB 11

    .CODE
Begin:
    MOV AX,@DATA
    MOV DS,AX

    MOV AH,9
    MOV DX,OFFSET DisplayString
    INT 21h

    MOV BL,0 ; Initialize BL to zero!

    ; //READ 3 DIGITS // ;
    ;read first digit for e.g. '1'
    MOV ah,1h
    INT 21h ;read into AL
    SUB AL,30h ; Convert the digit from ASCII to DECIMAL
    MOV myNum,AL

    MOV AH,1
    INT 21h

    CMP AL,13 ;is it Enter?
    JE endInput
    SUB AL,'0' ;Not enter, let's save this new char
    MOV CL, AL ; we save the 2nd char to CL
    MOV AL, myNum ; lets move our first char to AL
    MUL Ten ; multiply by 10 the first char
    MOV myNum,AL ;move that to myNum
    ADD myNum,CL ; add to AL the 2nd char.

    MOV AH,1
    INT 21h

    CMP AL,13 ; is it enter?
    JE endInput
    SUB AL,'0' ;Not enter, let's save this new char
    MOV CL, AL ; we save the 2nd char to CL
    MOV AL, myNum ; lets move our first char to AL
    MUL Ten ; multiply by 10 the first char
    MOV myNum,AL ;move that to myNum
    ADD myNum,CL ; add to AL the 2nd char.

    mov AH,1 ; if the number is 3 chars then this will be the enter now. 
    int 21h 

    ; // FINISH READING 3 DIGITS // ;
    endInput:

            ; AL = AX / two
        ; AH = AX % two
MOV AH, 0 ;reset AH before division
MOV AL,myNum ;move the inputed number to AL
DIV two ;div 123 / 2;
CMP AH,0
JNE inputIsPrime

;If 123 % 2 = 0, output 123 / 2.
DIV ten
MOV DH,AH

SUB AL,'0'
MOV AH,2
MOV DL, AL
INT 21h

MOV divisionCalc,DH

MOV AH,2
MOV DL,DH
INT 21h
JMP endProg

inputIsPrime:
MOV AH,9
MOV DX,OFFSET isPrimeNum
INT 21h

endProg:
MOV AH,4Ch
INT 21h
END Begin