Printing out a number in assembly language

Question

mov al 10 add al 15   How do I print the value of  al

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good example of      unlimited num print   model small   stack 100h   data  number word 6432  string db 10 dup        code   main proc  mov ax  data   mov ds ax    mov ax number  mov bx  10  mov cx 0  l1   mov dx 0  div bx  add dx 48  push dx  inc cx  cmp ax 0  jne l1   mov bx  offset string   l2   pop dx             mov  bx  dx  inc bx    loop l2    mov ah 09  mov dx offset string  int 21h mov ax 4c00h  int 21h   main endp  end main

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DOS Print 32 bit value stored in EAX with hexadecimal output  for 80386    on 64 bit OS use DOSBOX    code     mov ax  DATA          get the address of the data segment     mov ds ax             store the address in the data segment register  -----------------------     mov eax 0FFFFFFFFh    32 bit value  0 - FFFFFFFF  for example  -----------------------   convert the value in EAX to hexadecimal ASCIIs  -----------------------     mov di OFFSET ASCII   get the offset address     mov cl 8              number of ASCII P1  rol eax 4             1 Nibble  start with highest byte      mov bl al     and bl 0Fh            only low-Nibble     add bl 30h            convert to ASCII     cmp bl 39h            above 9      jna short P2     add bl 7               A  to  F  P2  mov  di  bl           store ASCII in buffer     inc di                increase target address     dec cl                decrease loop counter     jnz P1                jump if cl is not equal 0  zeroflag is not set   -----------------------   Print string  -----------------------     mov dx OFFSET ASCII   DOS 1  WRITE STRING TO STANDARD OUTPUT     mov ah 9              DS DX- gt    -terminated string     int 21h               maybe redirected under DOS 2  for output to file                            using pipe character  gt    or output to printer      terminate program      data ASCII DB  00000000  0Dh 0Ah       buffer for ASCII string   Alternative string output directly to the videobuffer without using software interupts    -----------------------   Print string  -----------------------     mov ax 0B800h         segment address of textmode video buffer     mov es ax             store address in extra segment register      mov si OFFSET ASCII   get the offset address of the string    using a fixed target address for example  screen page 0    Position on screen    Line number 80 2     Row number 2       mov di  10 80 2   10 2      mov cl 8              number of ASCII     cld                   clear direction flag  P3  lodsb    get the ASCII from the address in DS SI   increase si     stosb    write ASCII directly to the screen using ES DI   increase di     inc di   step over attribut byte     dec cl   decrease counter     jnz P3   repeat  print only 8 ASCII  not used bytes are  0Dh 0Ah         Hint  this directly output to the screen do not touch or move the cursor   but feel free to modify

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Call WinAPI function  if u are developing win-application

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PRINT SUM PROC NEAR  CMP AL  0  JNE PRINT AX  PUSH AX  MOV AL   0   MOV AH  0EH  INT 10H  POP AX  RET      PRINT AX       PUSHA  MOV AH  0  CMP AX  0  JE PN DONE  MOV DL  10  DIV DL      CALL PRINT AX  MOV AL  AH  ADD AL  30H  MOV AH  0EH  INT 10H         PN DONE   POPA    RET   PRINT SUM ENDP

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AH   09     DS DX   pointer to string ending in      returns nothing   - outputs character string to STDOUT up to     - backspace is treated as non-destructive - if Ctrl-Break is detected  INT 23 is executed   ref  http   stanislavs org helppc int 21-9 html     data    string db 2 dup        code   mov ax  data   mov ds ax  mov al 10   add al 15   mov si offset string 1   mov bl 10   div bl   add ah 48   mov  si  ah   dec si   div bl   add ah 48   mov  si  ah    mov ah 9   mov dx string   int 21h

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Assuming you are writing a bootloader or other application that has access to the BIOS  here is a rough sketch of what you can do    Isolate the first digit of the hex byte If it is greater than 9  i e  0x0A to 0x0F   subtract 10 from it  scaling it down to 0 to 5   and add  A   0x41    If it is less than or equal to 9  i e  0x00 to 0x09   add  0  to it  Repeat this with the next hex digit    Here is my implementation of this     Prints AL in hex  printhexb      push ax     shr al  0x04     call print nibble     pop ax     and al  0x0F     call print nibble     ret print nibble      cmp al  0x09     jg  letter     add al  0x30     mov ah  0x0E     int 0x10     ret  letter      add al  0x37     mov ah  0x0E     int 0x10     ret

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Assembly language has no direct means of printing anything  Your assembler may or may not come with a library that supplies such a facility  otherwise you have to write it yourself  and it will be quite  a complex function  You also have to decide where to print things - in a window  on the printer  In assembler  none of this is done for you

User · Answer

Have you tried int 21h service 2   DL is the character to print   mov dl  A    print  A  mov ah 2 int 21h   To print the integer value  you ll have to write a loop to decompose the integer to individual characters   If you re okay with printing the value in hex  this is pretty trivial   If you can t rely on DOS services  you might also be able to use the BIOS int 10h with AL set to 0Eh or 0Ah

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mov al 3  print     mov dl al   call print service 2  to print from dl   mov ah 2 int 21h   return to DOS   mov ah 76  76   4ch  int 21h  call interrupt

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You might have some luck calling the Win32 API s MessageBoxA  although whether Win16 supports that particular method is for someone else to answer

[assembly] Printing out a number in assembly language?

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