CODEWITHSUNDEEP
assemblymasmirvine32
Faris AL-baitouni
Faris AL-baitouni

Reputation: 13

Getting symbols instead of int

I'm getting symbols instead of int when I ask the user to enter the rown & coln with the readint and writestring afterward. How can I get the int entered to show up?

.686
.MODEL FLAT, STDCALL
.STACK
INCLUDE Irvine32.inc

.Data
txt1 byte "ENTER NUM OF ROWS:",0dh,0ah,0
txt2 byte "ENTER NUM OF COLUMNS:",0dh,0ah,0
txt3 byte "ENTER AN ARRAY OF"

rown byte 0,"x"                             ;rows number
coln byte 0,":",0dh,0ah,0                   ;columns number


.CODE
main PROC
mov edx,offset txt1
call writestring                            ;asks the user to enter the rows number
call readint
mov rown,al
mov edx,offset txt2
call writestring
call readint                                ;asks the user to enter the columns number
mov coln,al

mov edx, offset txt3
call writestring  ;;;;; here is the problem !!!!!
call waitmsg
       exit
main ENDP
END main

Upvotes: 0

Views: 806

Answers (2)

rkhb
rkhb

Reputation: 14409

Irvine's ReadInt converts the inputted number into the CPU internal format "DWORD". To write it as ASCII (WriteString) it must be converted. Since in the posted program is reserved only one byte for each number and only stored AL, I assume that only the range 0..9 has to be converted. Hence, just one number has to be converted to one ASCII character. A conversion table looks like this:

CPU -> ASCII
 0  ->  48
 1  ->  49
 2  ->  50
 3  ->  51
 4  ->  52
 5  ->  53
 6  ->  54
 7  ->  55
 8  ->  56
 9  ->  57

Tl;dr: Just add 48 to AL:

;.686                                       ; Included in Irvine32.inc
;.MODEL FLAT, STDCALL                       ; Included in Irvine32.inc
;.STACK                                     ; Not needed for .MODEL FLAT
INCLUDE Irvine32.inc

.DATA
    txt1 byte "ENTER NUM OF ROWS:",0dh,0ah,0
    txt2 byte "ENTER NUM OF COLUMNS:",0dh,0ah,0
    txt3 byte "ENTER AN ARRAY OF "

    rown byte 0,"x"                             ;rows number
    coln byte 0,":",0dh,0ah,0                   ;columns number

.CODE
main PROC
    mov edx,offset txt1
    call WriteString                        ;asks the user to enter the rows number
    call ReadInt
    add al, 48
    mov rown, al
    mov edx, offset txt2
    call WriteString
    call ReadInt                            ;asks the user to enter the columns number
    add al, 48
    mov coln, al
    mov edx, offset txt3
    call WriteString
    call WaitMsg
    exit
main ENDP
END main

Some caveats:

1) Irvine's ReadInt "reads a 32-bit signed decimal integer". Thus, the number in EAX can be out of the range 0..9 and in AL is anything else than a valid number. To convert the whole value in EAX take a look `here.

2) At rown and coln are now ASCII characters. They eventually have to be converted to integer before further processing.

3) A conversion of a DWORD that would lead to two decimal digits or more is a little bit more complicated.The single digits must be isolated by repeatedly divide by 10 and store the remainder.

Upvotes: 0

BlackBear
BlackBear

Reputation: 22979

I'm juts guessing since the important part of the code is missing.
Since readInt read and returns a number, you should probably re-convert it to a string before writing.
Just to be sure, try to enter 97 (decimal) as the number of columns and rows. If I am not mistaken, the output message will be "ENTER AN ARRAY OF axa:"

Upvotes: 2

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