%macro print 4        ;macro for printing data
	mov rax,%1   ;func num for outputting data
	mov rdi,%2   ;file descriptor ID for output device(monitor)
	mov rsi,%3   ;starting address of the string
	mov rdx,%4   ;number of bytes to be displayed
	syscall
%endmacro

section .data            ;initialized variable declaration
msg db "Addition of the numbers is: "
msgLen equ $-msg
array db 12,3,4,2,1   ;declare the numbers in the array
newline db "",10

section .bss  ;uninitialized variable declaration
sum resb 4
temp resb 4

section .text

global _start          ;entry point of the program
_start:              

print 1,1,msg,msgLen
mov rsi, array           ;move the register source index to the first element in the array
mov ax, 00h              ;initialize contents of accumulator and register b to 0
mov bx, 00h
mov cx, 5              ;set the counter to 5
		
up2:
mov bl, byte[rsi]
add ax, bx
jnc skip
inc ah

skip:	 
inc rsi                 ;go to the next location
dec cx                  ;decrement the counter
jnz up2

mov word[sum],ax

mov bp, 4
mov ax, word[sum]

up:                                  ;simple hex to ascii conversion
rol ax, 4    ; rotate left ax by 4
mov bx, ax   ; store copy of ax in bx
and ax, 0fh   ; mask al to keep only 1 nibble
cmp al, 09    ; compare accumulator contents with 09
jbe down        ;if digit<= 9 go to 'down'
add al, 07      ;else add 07H and then go to 'down'

down: 
add al, 30h        ;add 30H to the accumulator contents
mov [temp], al
print 1, 1,temp, 1         ;print the sum stored in temp
mov ax, bx
dec bp
jnz up

print 1,1,newline,1           ;print the newline character
print 60,0,0,0               ;exit from the code(60 is the function number for sys_exit)