armstrong.asm

section .data
msg1 db "Given number is Armstrong Number", 0xa, 0xc
len1 equ $ - msg1
msg2 db "Given Number is not an Armstrong Number", 0xa, 0xc
len2 equ $ - msg2
num dq 1634 ;input your number
sum dq 0
digits dq 3
it dq 0

section .text
global _start

power:
mov ecx, [digits]
mov esi, eax
mov eax, 1
p_loop:
dec ecx

mul esi
cmp ecx, 0
jg p_loop
ret

_start:
mov eax, [num]
xor ecx, ecx
div_loop:
inc ecx
mov esi, 10
xor edx, edx
idiv esi
push edx
cmp eax, 0
jnz div_loop
mov [digits], ecx
mov [it], ecx

sum_it:
mov ecx, [it]
dec ecx
mov [it], ecx
pop eax
call power
add [sum], eax
mov ecx, [it]
cmp ecx, 0
jnz sum_it
mov eax, [sum]

check:
mov eax, [sum]
mov ebx, [num]
cmp eax, ebx
jne non_armstrong

armstrong:
mov eax, 4
mov ebx, 1
mov ecx, msg1
mov edx, len1
int 0x80
jmp exit

non_armstrong:
mov eax, 4
mov ebx, 1
mov ecx, msg2
mov edx, len2
int 0x80

exit:
mov eax, 1
mov ebx, 0
int 0x80