This is an assembly program, we are tasked with converting a string to a int, th
ID: 3751099 • Letter: T
Question
This is an assembly program, we are tasked with converting a string to a int, the string has values base 14, and the integer will be base 10.
I have the following code but i get this error, error: label or instruction expected at start of line in line 49 with the jae 9lp. How do i fix this or why does it happen?
section .data
; -----
; Define constants
NULL equ 0
EXIT_SUCCESS equ 0
; successful operation
SYS_exit equ 60
SPACE equ " "
max_length dd 10
rsum dd 0
dig dd 0
ten db 10
intNum dd 0
fourteen dd 14
strNum db "1a7C",NULL
section .text
global _start
_start:
mov ecx, dword[max_length]
;; get string address
mov al , strNum
;; i = 0
mov rsi, 0
mov rbx, 0
Nxtchr: ;gets next character
mov al, byte[rbx + rsi *1] ; chr (ch = str[i])
cmp al, SPACE ;if (ch != " "), go to Nxtstp
jne Nxtstp
inc rsi ;i++
loop Nxtchr ;go to Nxtchr
mov ecx, dword[max_length]
mov r8d, 0
Nxtstp: ;next step to get int value
mov al, byte[rbx + rsi *1] ;chr (ch = str[i])
mov bl, NULL
cmp al ,bl
je Exitlp; if ( ch == NULL), exit l
cmp al , "0" ;if (ch is between "0" and "9")
jae 9lp
9lp:
cmp al , "9"
ja aLP
sub al, "0"
mov byte[ dig], al ; dig = ch - "0"
aLP:
cmp al ,"a" ;if (ch is between "a" and "d")
jae dLP
dLP:
cmp al, "d"
ja ALP
sub al, "a"
add al,byte[ ten] ;dig = ch -"a" +10
mov byte[ dig], al
ALP:
cmp al , "A" ;;if (ch is between "A" and "D"
jge DLP
DLP:
sub al, "A" ;;dig = ch -"A" +10
add al,byte [ ten]
mov byte[dig], al
mov eax, dword [ rsum] ;running sum = rsum * 14
mul fourteen
movzx eax, byte[dig]
add eax,byte[ dig] ;running sum = rsum +dig
mov dword[ rsum], eax
inc r8d
loop Nxtstp
Exitlp:
mov eax,dword[ rsum]
mov dword[intNum], eax
last:
mov rax, SYS_exit
mov rdi, EXIT_SUCCESS
syscall
Explanation / Answer
Everything is fine in Code.
Change name of 9lp to something else like elp and then exeute.
You will not face the error