(Preliminary information: As a newbie I managed to do a one digit calculator finally, but to do a multi-digits calculator I had to get some 'inspiration' from the internet as it is seen in the code.) The problem is when I hardcoded the input numbers calculator works perfectly ok. But when I try to get inputs from the users results are totally chaotic. I am working on this issue to solve it for almost 3 days but no solution. If anyone can help me I d be really appreciated. Thank you everyone
section .data
msg2 db 'Enter the first number: ',0xA,0xD
lmsg2 equ $- msg2
msg3 db 'Enter the second number: ',0xA,0xD
lmsg3 equ $- msg3
msg9 db 10,'Result= ',0
lmsg9 equ $- msg9
section .bss
; Spaces reserved for storing the values provided by the user.
num1 resd 4 ;;;;;;;;;;;UPDATED
num2 resd 4 ;;;;;;;;;;;UPDATED
result resd 8 ;;;;;;;;;;;UPDATED
result_len resd 1 ;;;;;;;;;;;UPDATED
section .text
global _start
_start:
; Print on screen the message 2
mov eax, 4
mov ebx, 1
mov ecx, msg2
mov edx, lmsg2
int 80h
; We get num1 value.
mov eax, 3
mov ebx, 0
mov ecx, num1
mov edx, 4
int 80h
; Print on screen the message 3
mov eax, 4
mov ebx, 1
mov ecx, msg3
mov edx, lmsg3
int 80h
; We get num2 value.
mov eax, 3
mov ebx, 0
mov ecx, num2
mov edx, 4
int 80h
mov eax, 12 ;;;;;;;[num1] WHEN BEING PUT A NUMBER DIRECTLY IT WORKS
mov ebx, 55 ;;;;;;;;[num2] UPDATED- WHEN BEING PUT A NUMBER DIRECTLY IT WORKS
; Convert from ascii to decimal
sub eax, '0' ;;;;;;;;;;; UPDATED- COMMENTED OUT
sub ebx, '0' ;;;;;;;;;;; UPDATED- COMMENTED OUT
; Add
add eax, ebx
; Conversion from decimal to ascii
add eax, '0' ;;;;;;;;;;; UPDATED- COMMENTED OUT
; THIS IS THE AREA PROBLEMS HAPPEN
mov edi, result ; argument: Address of the target string
call int2str ; Get the digits of EAX and store it as ASCII
sub edi, result ; length of the string
mov [result_len], edi
; Output "The sum is: "
mov eax, 4
mov ebx, 1
mov ecx, msg9
mov edx, lmsg9
int 0x80
; Output sum
mov eax, 4
mov ebx, 1
mov ecx, result
mov edx, [result_len] ;;;;;;;;;;;UPDATED
int 0x80
; Exit code
mov eax, 1
mov ebx, 0
int 0x80
;LOOPS FOR DOING THE MULTI DIGITS OPERATION
int2str: ; Converts an integer in EAX to a string pointed to by EDI
xor ecx, ecx
mov ebx, 10
.LL1: ; First loop: Save the remainders
xor edx, edx ; Clear EDX for div
div ebx ; EDX:EAX/EBX -> EAX Remainder EDX
push dx ; Save remainder
inc ecx ; Increment push counter
test eax, eax ; Anything left to divide?
jnz .LL1 ; if Yes: loop once more.. jump if not zero
.LL2: ; Second loop: Retrieve the remainders
pop dx ; In DL is the value
or dl, '0' ; To ASCII
mov [edi], dl ; Save it to the string (
inc edi ; Increment the pointer to the string
loop .LL2 ; Loop ECX times
mov byte [edi], 0 ; Termination character
ret ; RET: EDI points to the terminating NULL
