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Old February 4th, 2004, 10:59 AM
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Default Need some help in Aseembly Language programming

Hello Everybody

This is my first time writing on here so I will do my best to describe my two problems.

A) I have to make up a program that would change a hexadecimal number of length 4 (e.g. A10F) and change it into decimal form (e.g. 41231)

B) Using the addigits.asm file i have to change to read the string even if other characters are put in by the user (e.g. r6lk72É? would be equal to 15)

I have included the addigits.asm file below. If you could help or give me any clue on how to solve these i would really appreciate it.

TITLE Add individual digits of a number ADDIGITS.ASM
COMMENT |
        Objective: To find the sum of individual digits of
                   a given number. Shows character to binary
                   conversion of digits.
            Input: Requests a number from keyboard.
| Output: Prints the sum of the individual digits.
.MODEL SMALL
.STACK 100H
.DATA
number_prompt DB 'Please type a number (<11 digits): ',0
out_msg DB 'The sum of individual digits is: ',0
number DB 11 DUP (?)

.CODE
INCLUDE io.mac
main PROC
        .STARTUP
        PutStr number_prompt ; request an input number
        GetStr number,11 ; read input number as a string
        nwln
        mov BX,OFFSET number ; BX := address of number
        sub DX,DX ; DX := 0 -- DL keeps the sum
repeat_add:
        mov AL,[BX] ; move the digit to AL
        cmp AL,0 ; if it is the NULL character
        je done ; sum is done
        and AL,0FH ; mask off the upper 4 bits
        add DL,AL ; add the digit to sum
        inc BX ; increment BX to point to next digit
        jmp repeat_add ; and jump back
done:
        PutStr out_msg
        PutInt DX ; write sum
        nwln
        .EXIT
main ENDP
        END main
 
Old February 4th, 2004, 02:53 PM
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Default

See this thread.

Peter
------------------------------------------------------
Work smarter, not harder.
 
Old March 25th, 2004, 07:46 AM
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Default

I might be able to help. I took a course on Assembly and MIPS. I don't quite understand what you mean by having invalid input. What would you like it to do if they enter invalid characters? So you have to check and not assume they enter valid characters? Will the user enter 4 or can they do more or less?

you know the logic though right? Here's a little hint. starting with the least signinificant bit. Let 0 be represent that, by a variable. Raise 16 to that power and mulitply it by the number there. you need to convert letters A-F to be 10-15 respectively.

Seeing as this sounds like a homework, you might not be interested in getting back to me,since it was probably due. But if your still interested email me. I can help you out.

RAyRAy
Huh O i C

Program or Be Programmed!!!





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