CODEWITHSUNDEEP
assemblynasm
DavidN.
DavidN.

Reputation: 125

print number to screen assembly

I want to print a number in a register to the screen. Furthermore I want to save it as a string of characters (bytes). So if I had a number like 150, I would want to save it at a certain address as

'1', '5', '0'

mov ebx, dword ptr[ebp+8]
; eax contains value
; ebx contains address to store characters

; here is where conversion would take place

Since it's in a register, would you have to convert it to decimal value and then separate each place?

Upvotes: 1

Views: 1064

Answers (1)

Dirk Wolfgang Glomp
Dirk Wolfgang Glomp

Reputation: 194

I´am not sure how to print the ASCII's and how to separate each place. And so i only like to show how to convert the value of EAX to decimal ASCII's and store it to the address of DS:EBX. For a 32 bit value of maximum 0FFFFFFFFh we need a place for ten decimal ASCII's (4294967295). And for example if the value is decimal 150, then we get the ASCII's of "0000000150" with some "0" at the beginning.

      mov     cl, 0Ah             ; counter for ten decimal ASCII's
      mov     edi, 1000000000
P1:   xor     edx, edx
      div     edi
      add     al, 30h             ; convert to ASCII
      mov     esi, edx            ; save remainder
      mov     [ebx], al           ; store ASCII to the address of DS:EBX
      inc     ebx
      mov     eax, edi
      mov     edi, 0Ah
      xor     edx, edx
      div     edi
      mov     edi, eax
      mov     eax, esi
      dec     cl
      jnz P1

Upvotes: 1

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