I posted a topic similar to this some time ago and received the help I needed to get me started on a project that I was having trouble with. I am currently in a similar situation and need some help getting started with a second project that I have been assigned by my professor. An image of the first of several requirements for the project is pasted below.
(http://puu.sh/o4Xh8/593f24fd1e.png)
My current code is the following:
INCLUDE c:\irvine\irvine32.inc
INCLUDELIB c:\irvine\irvine32.lib
INCLUDELIB c:\masm32\lib\user32.lib
INCLUDELIB c:\masm32\lib\kernel32.lib
.data
theSINTArray BYTE 25 dup(?)
prompt BYTE "Please enter a value: ",0
MAX = 10 ;max chars to read from input
stringIn BYTE MAX+1 DUP (?) ;room for null
.CODE
main PROC
push TYPE theSINTArray
push LENGTHOF theSINTArray
push OFFSET theSINTArray
call requestInput
exit
main ENDP
requestInput PROC
push edx
push ecx
mov edx,OFFSET prompt
call WriteString
mov edx,OFFSET stringIn
mov ecx,MAX ;buffer size - 1
call ReadString
pop ecx
pop edx
ret
requestInput ENDP
END main
The first thing I would like assistance with is altering my current code so that it stores the input signed integers into theSINTArray, like it says to in the requirement. This is where I'm stuck. Is there anybody who can provide assistance on how to do this? As a sidenote, I am using the masm32 assembler (as you probably guessed) as well as Irvine's library.
With array, you have :
1) A Base pointer that points to the beginning of the array
2) an index which points to any member of the array (you control this)
So You'll be looking at something like
ThisArray DD 25 DUP (0) ; An array of 25 Dwords
ThisIndex DD 0 ; Index pointer into the array
You'll need a BASE address of the array..
mov EDI, OFFSET ThisArray ; Both these lines give you a Base address
LEA EDI, ThisArray ; but are used in different circumstances
XOR EBX,EBX ;Resets the index pointer
MOV ThisIndex, EBX
So as you enter values into the array - EAX is usually the workhorse register and you now want to place the values (EAX) onto the array index (EBX)
MOV [EDI + EBX*4], EAX ; Have a look at [Index addressing] with regard to the formats (Final Address = Base + Index * Scale)
Don't forget your limit checks on the Index numbers
:biggrin:
Thank you for your assistance, K_F. I do not have time to work on the project currently, but I will be using your post for assistance when I work on it over the weekend.