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dec to hex
Subject: dec to hex  ·  Posted: 2006-10-12, 09:23pm
Rank: ? (4)
Member #: 28621
can anyone help me to convert dec to hex in assembler with 2 digit inputs from the user? please help i need it badly. thank you in advance

 
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Subject: Re: dec to hex  ·  Posted: 2006-10-13, 03:36am
Rank: ? (4821)
Member #: 3416
what part are you stuck on?

my mind is like a steel trap! it only hangs on to the big stuff. visit my forums at track7.org
 
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Subject: Re: dec to hex  ·  Posted: 2006-10-13, 12:25pm
Rank: ? (4)
Member #: 28621
specifically converting dec to hex...cant display the output..

 
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Subject: Re: dec to hex  ·  Posted: 2006-10-13, 10:30pm
Rank: ? (5)
Member #: 28723
Hi,

i just did a conversion for dec<->hex, maybe u can find some hints.
Basically i stored the entered value in a variable ( by multiplying each number with the right power ( *10/16 for hex)
Then i display the sum byte for byte by dividing with the right divisor ( again 10 for dec,16 (not h!) for hex)

greetz,

olli

Code:
  1. model tiny
  2. .data?
  3. estr            db 10 dup(?)
  4. e_len           dw ?
  5. hex_mode db ?
  6. summe dw ?
  7. .data
  8. msg_start db 13,10,'Enter value ( nnh for hex value, Enter=Ende) !',13,10,'$'
  9. msg_summe db 13,10,' equals: $'
  10. msg_hex db ' decimal ',13,10,'$'
  11. msg_dec db ' h',13,10,'$'
  12. msg_ende db 13,10,'Program ended normally',13,10,'$'
  14. .code
  15.        
  16. ; konstanten
  17. dos equ 021h
  19. print macro meldung
  20.         lea dx, meldung
  21.         mov ah,09
  22.         int dos
  23. endm
  25. putc macro
  26.         mov ah,02
  27.         int dos
  28. endm
  30. .startup
  31. b00_10:
  32.         call b10_read_input
  33.         cmp e_len,0
  34.         je main_ende
  35.         call b20_calc
  36.         call b40_print_summe
  37.         loop b00_10
  38. main_ende:
  39.         print msg_ende
  40. .exit
  42. b40_print_summe:
  43.         print msg_summe
  44.         mov ax,summe
  45.         xor bx,bx
  46.         xor cx,cx
  47.         mov bl,10
  48.         cmp hex_mode,1
  49.         je b40_10
  50.         mov bl,16
  51. b40_10:
  52.         inc cx
  53.         xor dx,dx
  54.         div bx
  55.         push dx
  56.         cmp ax,0
  57.         jne b40_10
  58. b40_20:
  59.         pop dx
  60.         add dl,30h ; auf asci erweitern
  61.         cmp dl,'9'
  62.         jna b40_25
  63.         add dl,27h
  64. b40_25:
  65.         putc
  66.         loop b40_20
  67.         cmp hex_mode,1
  68.         jne b40_30
  69.         print msg_hex
  70.         jmp b40_35
  71. b40_30:
  72.         print msg_dec
  73. b40_35:
  74. ret
  75. ;----------------------------------------------
  76. ; eingabe in summe umrechnen
  77. ; je stelle mal x 10 bzw.  x 16 fuer hexa
  78. ;----------------------------------------------
  79. b20_calc:
  80. mov summe,0
  81. lea si,estr
  82. mov bx,e_len
  83. b20_10:
  84.         mov ax,summe
  85.         cmp hex_mode,1 ; hex modus ?
  86.         je b20_15
  87.         mov cl,3
  88.         shl ax,cl
  89.         add ax,summe ;( x*8+x*2=x*10 
  90.         add ax,summe
  91.         jmp b20_17
  92. b20_15:
  93.         mov cl,4 ; fuer hexa * 2^4=*16
  94.         shl ax,cl
  95. b20_17:
  96.         mov summe,ax
  97.         mov al,[si]
  98.         sub al,30h ; asci->wert umrechnen
  99.         cmp al,10 ; wenn > 10 ists hexa a-f
  100.         jb b20_20
  101.         sub al,27h ;(49-39=10) 'a' -> 10d  umwandeln
  102. b20_20:
  103.         xor ah,ah
  104.         add summe,ax
  105.         inc si
  106.         dec bx
  107.         jnz b20_10
  108. ret
  109. ;------------------------------------------
  110. ; eingabe einlesen
  111. ;------------------------------------------
  112. b10_read_input:
  113.         print msg_start
  114.         mov hex_mode,0
  115.         mov e_len,0
  116.         lea di,estr
  117. b10_20:
  118.         mov ah,01       ; 1 byte einlesen
  119.         int dos
  120.         cmp al,13
  121.         je b10_30
  122.         inc e_len
  123.         mov [di],al
  124.         inc di  ; position to next character
  125.         jmp b10_20 ;naechstes zeichen einlesen
  126. b10_30:
  127.         dec di
  128.         mov al,[di]
  129.         cmp al,'h'      ; h last character ?
  130.         jne b10_50
  131.         mov hex_mode,1  ; hex modus setzen
  132.         dec e_len ; "h" sub 1 from length for "h"
  133. b10_50:
  134. ret
  135. end


» Post edited 2006-10-13, 10:32pm by kermit.
 
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Subject: Re: dec to hex  ·  Posted: 2006-10-17, 08:20pm
Rank: ? (4)
Member #: 28621
im using tasm, pls convert it into tasm.. thank you

 
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Subject: Re: dec to hex  ·  Posted: 2006-10-21, 09:14pm
Rank: ? (119)
Member #: 28292
Hm.. As far as I know Tasm supports Masm syntax

 
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