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Apr 26th, 2007
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Help on Storing Strings from Keyboard...

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Hey I am doing a program in palindromes.


Don't worry, I dont want any code (I read the sticky). But this is my first semester using it, and my second program. I am having trouble in storing the word from the user. Right now it only stores one character. How can I make it save the entire word? What am I doing wrong?



Should I save the word one letter at a time in a loop so I can make it go in reverse order? Using Pops and Pushes?

I am using Tasm. Here is my code for reference

[code = language][inline code]
MSG1 DB ' Enter a word $'
theword db 20 dup( ' '), 0
ItIs DB 'The word is a Palindrome $'
ItIsNot DB 'The word is not a Palindrome $'

....
....
GetPut:

lea dx,MSG1 ;addr. of 1st msg
mov ah,9 ;set for str. displ.
int 21H ;call DOS to displ.

;DISPLAY MESSAGE ABOVE;


mov ah,1 ;set func. to Get
int 21H ;call DOS (val-AL)

;USER ENTERS STRING ABOVE;

mov theword,al ;move input to theword




lea dx,theword ;move the word to dx register
mov ah,9 ;move 9 to ah signaling output
int 21h ;call the interrupt

[/inlinecode]
[\code]
The current output is that it only allows me to type in one letter. Then the letter is echo'd (with no space in between). And the string that the word is a palindrome


If someone can show me how to have the user entered a string from they keyboard, and how I store it, that will be a big help.
Last edited by gparadox; Apr 26th, 2007 at 3:09 pm.
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Re: Help on Storing Strings from Keyboard...

OK I figured out how to store string input.
but the output disappears, I want it to stay.
Assembly Syntax (Toggle Plain Text)
  1. TITLE Proj2
  2.  
  3. PAGE 56,90
  4. ;  file:      Proj2.asm
  5. ;  author:    xxxxx
  6. ;  date:      04/26/07
  7. ; Based on: xxxxx
  8. ;    
  9. ; ----------------------------------------
  10.  
  11. ; ----------------------------------------
  12.  
  13.  
  14.  
  15. .MODEL   SMALL
  16. .STACK   100H
  17. .DATA
  18. CR       EQU     0DH ; Carriage Return Code
  19. LF       EQU     0AH ; Line Feed Control Code
  20. DOSEXIT  EQU     4CH ; DOS exit code for 21h int
  21.  
  22.  
  23. para_list LABEL BYTE
  24. max_len db 20
  25. act_len db ?
  26. theword db 20 DUP(' ')
  27. MSG1     DB      'Enter a word $'
  28.  
  29. ItIs    DB    'The word is a Palindrome $'
  30. ItIsNot DB    'The word is not a Palindrome $'
  31.  
  32.  
  33. ; --------- End of Data Segment ----------
  34. .CODE  
  35. Main   PROC
  36.  
  37. ;------------------------------------------
  38. ;   The routine performs basic 
  39. ;   "housekeeping" operations necessary in
  40. ;   any Assembly Language Program running
  41. ;   under DOS or Windows...
  42. ;     1 - Establish Addressability to the
  43. ;         Data Segment of the program.
  44. ;------------------------------------------
  45.  
  46. HouseKeeping:
  47.  
  48.        mov  ax,@data   ;get addr. of DSeg.
  49.        mov  ds,ax      ;set in DS Reg.
  50.  
  51. ;------------------------------------------
  52. ;   Routine "GetPut" will...
  53. ;     1 - Display prompt message.
  54. ;     2 - capture user provided ASCII
  55. ;         letter (located in AL register).
  56. ;     3 - Convert the letter to it's decimal
  57. ;      equivalent.
  58. ;     4 - Display the converted letter within
  59. ;     an "echoing" message.
  60. ;------------------------------------------
  61. Prompt:
  62.  
  63.  
  64.        lea  dx,MSG1    ;addr. of 1st msg
  65.        mov  ah,9h       ;set for str. displ.
  66.        int  21H        ;call DOS to displ.
  67.  
  68.        ;DISPLAY MESSAGE ABOVE;
  69.  
  70.  
  71. GetWord:
  72.          mov  ah,0Ah       ;set func. to Get String
  73.          lea DX,Para_list    ;load address of para list
  74.          int  21H        ;call DOS (val-AL)
  75.  
  76.  
  77.  
  78.          mov theword,al   ;move input to theword
  79.      lea dx,theword
  80.            mov ah,9
  81.             int 21h
  82.  
  83.  
  84.  
  85.  
  86.  
  87.  
  88.  
  89.  
  90.  
  91.  
  92.  
  93.  
  94.  
  95. ;------------------------------------------
  96. ;   The routine sets the exit code and 
  97. ;   calls DOS.  This is the appropriate
  98. ;   technique for terminating a non-
  99. ;   resident program running under DOS.
  100. ;------------------------------------------
  101.  
  102. PgmExit:
  103.        mov  ah,DOSEXIT ;set Exit code
  104.        int  21H        ;and call DOS
  105. Main EndP
  106.        End  Main

Now I need an idea of how to check if it is an palindrome or not.
Last edited by gparadox; Apr 26th, 2007 at 7:12 pm. Reason: to put it in code format
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Re: Help on Storing Strings from Keyboard...

For some reason it is writing it backwards, but it skips the first letter. If I enter georgios, it will display 'soigroe'.
Any idea why it is skipping the first letter?
Assembly Syntax (Toggle Plain Text)
  1. TITLE Proj2
  2.  
  3. PAGE 56,90
  4. ;  file:      Proj2.asm
  5. ;  date:      04/26/07
  6. ; ----------------------------------------
  7. ;
  8. ;  
  9. ;    This program will take a name entered by the user
  10. ;    and display it backwards. It will also tell the
  11. ;    user whether the word is a palindrome or not.
  12. ; ----------------------------------------
  13.  
  14.  
  15.  
  16. .MODEL   SMALL
  17. .STACK   100H
  18. .DATA
  19. CR       EQU     0DH ; Carriage Return Code
  20. LF       EQU     0AH ; Line Feed Control Code
  21. DOSEXIT  EQU     4CH ; DOS exit code for 21h int
  22.  
  23.  
  24. para_list LABEL BYTE
  25. max_len db 20
  26. act_len db ?
  27. theword db 20 DUP(' ')
  28. MSG1     DB      'Enter a word $'
  29.  
  30. ItIs    DB    'The word is a Palindrome $'
  31. ItIsNot DB    'The word is not a Palindrome $'
  32. MSG2    DB     'The word backwards is $'
  33. wordbw DB 12 DUP(20H),'$'          
  34.  
  35.  
  36. ; --------- End of Data Segment ----------
  37. .CODE  
  38. Main   PROC
  39.  
  40. ;------------------------------------------
  41. ;   The routine performs basic 
  42. ;   "housekeeping" operations necessary in
  43. ;   any Assembly Language Program running
  44. ;   under DOS or Windows...
  45. ;     1 - Establish Addressability to the
  46. ;         Data Segment of the program.
  47. ;------------------------------------------
  48.  
  49. HouseKeeping:
  50.  
  51.        mov  ax,@data   ;get addr. of DSeg.
  52.        mov  ds,ax      ;set in DS Reg.
  53.  
  54. ;------------------------------------------
  55. ;   Routine "GetPut" will...
  56. ;     1 - Display prompt message.
  57. ;     2 - capture user provided ASCII
  58. ;         letter (located in AL register).
  59. ;     3 - Convert the letter to it's decimal
  60. ;      equivalent.
  61. ;     4 - Display the converted letter within
  62. ;     an "echoing" message.
  63. ;------------------------------------------
  64. Prompt:
  65.  
  66.  
  67.        lea  dx,MSG1    ;addr. of 1st msg
  68.        mov  ah,9h       ;set for str. displ.
  69.        int  21H        ;call DOS to displ.
  70.  
  71.            mov ah, 06h
  72.            mov al,00h
  73.         int 10h
  74.        ;DISPLAY MESSAGE ABOVE;
  75.  
  76.  
  77. GetWord:
  78.          mov  ah,0Ah       ;set func. to Get String
  79.          lea DX,Para_list    ;load address of para list
  80.          int  21H        ;call DOS (val-AL)
  81.  
  82.             mov theword,al   ;move input to theword
  83.  
  84.    ;Clear Screen         
  85.      mov ax,0600h
  86.      mov bh,07
  87.      mov cx,0000
  88.      mov dx,184fh
  89.      int 10h
  90.      ;Clear Screen
  91.  
  92.  
  93.  ChangeWord:
  94.  
  95.  CLD
  96.  
  97.  
  98.  MOV CX,20
  99.  LEA SI,theword
  100.  LEA DI,wordbw+11
  101.  
  102.  L20:
  103.      LODSB
  104.      MOV [DI],AL
  105.      DEC DI
  106.      LOOP L20
  107.  
  108.  
  109.  
  110. ;Clear Screen
  111.        mov ax,0600h
  112.        mov bh,07
  113.        mov cx,0000
  114.        mov dx,184fh
  115.        int 10h
  116. ;Clear Screen
  117.  
  118.        lea dx, wordbw
  119.        mov ah,9
  120.        int 21h
  121.  
  122.  
  123.  
  124. ;------------------------------------------
  125. ;   The routine sets the exit code and 
  126. ;   calls DOS.  This is the appropriate
  127. ;   technique for terminating a non-
  128. ;   resident program running under DOS.
  129. ;------------------------------------------
  130.  
  131. PgmExit:
  132.        mov  ah,DOSEXIT ;set Exit code
  133.        int  21H        ;and call DOS
  134.  
  135.  
  136.  
  137.  
  138.  
  139.  
  140. Main EndP
  141.        End  Main
Last edited by ~s.o.s~; Jan 8th, 2011 at 3:06 am. Reason: snipped out personal information as per user request
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