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add_and_sub.asm
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SYS_EXIT equ 1
SYS_READ equ 3
SYS_WRITE equ 4
STDIN equ 0
STDOUT equ 1
segment .data
msg1 db "Enter a digit ", 0xa, 0xd
len1 equ $- msg1
msg2 db "Please enter a second digit ", 0xa, 0xd
len2 equ $- msg2
msg3 db "The sum is: "
len3 equ $- msg3
segment .bss
num1 resb 2
num2 resb 2
res resb 3
section .text
global _start
_start:
mov eax, SYS_WRITE
mov ebx, STDOUT
mov ecx, msg1
mov edx, len1
int 0x80
mov eax, SYS_READ
mov ebx, STDIN
mov ecx, num1
mov edx, 2
int 0x80
mov eax, SYS_WRITE
mov ebx, STDOUT
mov ecx, msg2
mov edx, len2
int 0x80
mov eax, SYS_READ
mov ebx, STDIN
mov ecx, num2
mov edx, 2
int 0x80
mov eax, SYS_WRITE
mov ebx, STDOUT
mov ecx, msg3
mov edx, len3
int 0x80
; moving the first number to eax register and the second to ebx
; and subtract ascii '0' to convert it into a decimal number
mov eax, [num1]
sub eax, '0'
mov ebx, [num2]
sub ebx, '0'
; add eax and ebx
add eax, ebx
; add ascii '0' to convert the sum from decimal to ascii
add eax, '0'
;storing the sum in memory location res
mov [res], eax
;print the sum
mov eax, SYS_WRITE
mov ebx, STDOUT
mov ecx, res
mov edx, 3
int 0x80
exit:
mov eax, SYS_EXIT
xor ebx, ebx
int 0x80