macro print description,number
{
   display description
   value=number
   pos=1000
   repeat 4
      digit=value/pos
      value=value-(digit*pos)
      pos=pos/10
      display ('0'+digit)
   end repeat
   display $d,$a
}    

PrintAX:
  ;
   ; Assumption: all segments are set to the same value (COM program)
      ;
   pusha

   sub     sp, 16          ; Reserve 16 character buffer on stack
      lea     di, [sp + 15]   ; DI = address of a last character
  mov     byte [di], '$'        ; This is for AH=9 INT 21H
  mov     cx, 10          ; Will be dividing DX:AX by this
@@:
     xor     dx, dx
      div     cx              ; Divide DX:AX by 10

        dec     di              ; Avoiding AGI
      add     dl, '0'               ; Convert to a digit
        mov     [di], dl        ; And store it into buffer

      test    ax, ax          ; Check if there is more to divide?
 jnz     @r              ; Yes. Divide again.

    mov     dx, di          ; Dump string to console
    mov     ah, 9
       int     21h

     add     sp, 16          ; Restore stack and return
  popa
        ret
    

;assumes ds=es
itoa:
;in: ax = value
;    bx = base
;    di -> buffer
 cmp bx,10
 jne utoa
 test ax,ax
 jns utoa
 neg ax
 mov byte[ds:di],'-'
 inc di
;jmp utoa

utoa:
;in: ax = value
;    bx = base
;    di -> buffer
 xor dx,dx
 div bx
 push dx
 test ax,ax
 jz .purge
 call utoa
.purge:
 pop ax
 and al,0x0F
 cmp al,0x0A
 sbb al,0x69
 das
 stosw
 dec di
 ret
    

Hello everyone

tried searching for the answer to this in the forums but I couldn't seem to find anything.. I have a number in EAX that I'd like to print

things in other forums about repeatedly dividing by 10 and printing digit by digit, but I was unsure if this is the way to do it in FASM

why theres no 'print number' interupt?

lamer wrote:

why theres no 'print number' interupt?

Because there are many many ways to format numbers of different forms. Do you want binary? Octal? Decimal? Hexadecimal? Other base (like phinary)? And what about integer, float, fixed point? What precision? How many bits? 8? 16? 32? 64? Arbitrary size? Signed or unsigned? etc. etc. etc.

It is usually easier just to program what you need for the job at hand, rather than have the OS/BOIS provide some sort of uber-mega-ultra-bloated-number-to-text conversion routine.

not so many. you just make it sound bad but you actually wrote all the cases of a basic number printing interupt. no need to go crazy about it making it phinary and whatevernary. if you point it that way theres no need for a string printing interupt because everything can be coded from scratch 'easier'

lamer wrote:

not so many. you just make it sound bad but you actually wrote all the cases of a basic number printing interupt. no need to go crazy about it making it phinary and whatevernary. if you point it that way theres no need for a string printing interupt because everything can be coded from scratch 'easier'

The printing of a string is a basic function that an OS/BIOS should support because the hardware is different and app programs shouldn't have to concern themselves with hardware differences. But printing a number is not a basic function. A number is formatted into a string and then the string print function is used.

Besides I didn't mention all cases above. There are plenty more, including, but not limited to, character set selection, internationalisation for digit grouping, negative representation (accounting requirements), leading/trailing zeros, left/right justification, out of scope numbers (infinity, NaNs, etc.), etc. etc. etc.

... according to you logic string printing interupt is useless because of that and should not be made.

Hello everyone. I tried searching for the answer to this in the forums but I couldn't seem to find anything.. I have a number in EAX that I'd like to print out. I've seen things in other forums about repeatedly dividing by 10 and printing digit by digit, but I was unsure if this is the way to do it in FASM. Thanks!

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