Assembly language, program to check if a number is divideable by 2 and print numbers in a loop

Question

I've a macro that's working, and getting big numbers in assembly language. I've been trying to make a program that'd print numbers divideable by 2. It seems to me that something's wrong with the comparison script I've written.

mov cx, number1 
check:
mov dx, cx
mov bx, 2
div bx
cmp ax, 0
je divide
add ax, 1

loop:
divide:
printNumber ax
add ax, 2
cmp ax, number2
je end
jmp loop

Answer 1

If the number for which you want to test if it's divisible by 2 is in number1 and you know that the word division div bx actually divides DX:AX then you need to move the number to AX and zero DX .

check:
mov ax, number1 
xor dx, dx
mov bx, 2
div bx

The actual determination then comes from inspecting the remainder from this division by 2. The remainder is in the DX register!

cmp dx, 0
je  divisible

---

But all of this is overkill since testing to see if a number is even aka divisible by 2, is a simple matter of looking at its lowest bit:

test number1, 1
jz   divisible

Answer 2

Hi what if I want a program to check if a number is divisble by 2 and 8? and the code written in the question is not done?