section .data
    prompt db 'Please input a number from 1 to 9, or type 0 to exit', 0Ah
    prompt_len equ $-prompt
    total db 0    ;Initialize total to 0
    
section .bss
    input resb 1
    
section .text
global _start
_start:
repeat: 
   ;SYS_WRITE (Display Prompt)
   mov eax, 4       ;Tell computer what call we are doing (4 represents SYS_WRITE)
   mov ebx, 1       ;Tell computer where to send output (send to STDOUT, console/window)
   mov ecx, prompt  ;Tell computer where the data is that we want to print
   mov edx, prompt_len  ;Tell computer how long out prompt string is
   int 80h          ;Trigger interrupt, syscall happens, read our input
   
   ;SYS_READ (Read user input)
    mov eax, 3      ;Tell computer what call we're doing (3 represents sys_read)
    mov ebx, 0      ;Tell computer to read data from STDIN (console/input window)
    mov ecx, input  ;Tell computer to put the data it reads into the input variable
    mov edx, 1      ;Tell computer how long our input will be
    int 80h         ;Trigger interrupt, syscall happens, read our input
    
    ;Get our input into a register, then convert from ASCII into an integer
    mov al, [input]     ;Put our 1 byte of data into the lower half of the AX register (AL)
    sub ebx, '0'        ;Convert our ASCII char to an integer -- subtract 48 (char 0) from the value
    movzx ebx, al       ;Move with Zero Extend, put AL's value into EBX (extend 8 bit value, fill the rest of bits with 0s in EBX)
    
    ;Check conditions to see if we should leave our loop
    ;Check if our input is == 0
    cmp al, 0
    je exit_loop
    mov al, [total]
    add al, [input]
    cmp al, 9
    jg exit_loop
    
    ;If not exiting, add input to total
    mov al, [total]
    add al, [input]
    
    ;Repeat loop until conditions are met
    jmp repeat
    
exit_loop:
    ;Before you print and exit, you MUST convert your total back into ASCII from an integer
    ;To do that, add ASCII 0's value (48, '0') to the total.
    
   mov al, [total]     ;Put our 1 byte of data into the lower half of the AX register (AL)
   movzx ebx, al       ;Move with Zero Extend, put AL's value into EBX (extend 8 bit value, fill the rest of bits with 0s in EBX)
   add ebx, '0'        ;Convert our ASCII char to an integer -- subtract 48 (char 0) from the value
    
    ;SYS_WRITE syscall (Print the result)
   mov eax, 4       ;Tell computer what call we are doing (4 represents SYS_WRITE)
   mov ebx, 1       ;Tell computer where to send output (send to STDOUT, console/window)
   mov ecx, [total]   ;Tell computer where the data is that we want to print    *********CHANGE TO TOTAL!!!!!!*********
   mov edx, 1       ;Tell computer how long out prompt string is
   int 80h
   
   ;Exit the program
   ;Your program will stop running after this executes!
   mov eax, 1          ;sys_exit system call number
   mov ebx, 0          ;sys_exit, return 0 status on exit - 'No Errors'
   int 80h             ;interrupt to invoke a system call (and exit the program)