help w/ 4x4 matrix

here's the code i have so far:

.model small
.stack 100h

.data
numberPrompt db "Enter a number between 0 and 999: ", 0
sumRow1Msg db "The sum of row 1 is: ", 0
sumCol2Msg db "The sum of column 2 is: ", 0
numGtr100Msg db "The number of values > 100 is: ", 0
matrix db 4 dup (?)
db 4 dup (?)
db 4 dup (?)
db 4 dup (?)
count = 16

.code
extrn Writestringroc, Readintroc, Writeintroc, Crlfroc

main proc
mov ax, @data
mov ds, ax

call GetNums
call DisplayMatrix
call sumRow1
call sumCol2
call Greater100
call Swap1W2
main endp

GetNums proc
mov si, offset matrix
mov cx, count
GetData:
mov dx, offset numberPrompt
call Writestring
call Readint
call Crlf
mov [si], ax
add si, 2
loop GetData
GetNums endp

DisplayMatrix proc
mov si, offset matrix
mov cx, 4
loop:
mov ax, [si]
mov bx, 10
call Writeint
DisplayMatrix endp

;get sum row 1
sumRow1 proc
mov si, offset matrix
mov bx, [si]
mov cx, 3
Sum1:
add si, 2
add bx, [si]
loop Sum1

mov dx,offset sumRow1Msg
call Writestring
mov ax,bx ; get the sum(in BX)
mov bx,10
call Writeint ; display it

sumRow1 endp

;get sum col 2
sumCol2 proc
mov si, offset matrix+1
mov bx, [si]
mov cx, 3
Sum2:
add si, 4
add bx, [si]
loop Sum2

mov dx, offset sumCol2Msg
call Writestring
mov ax,bx ; get the sum(in BX)
mov bx,10
call Writeint ; display it
sumCol2 endp

; count display number vals > 100
;while (cx < count)
;{
; if ([si] < 100)
; count = count + 1
; cx++
; si = si +2
;}
Greater100 proc
mov cx, 1
While:
cmp cx, count
jg Enddo
cmp [si], 100
jl L2
inc bx
L2:
inc cx
add si, 2
jmp While
Enddo:
mov dx, offset numGtr100Msg
call Writestring
mov ax,bx ; get the sum(in BX)
mov bx,10
call Writeint ; display it
Greater100 endp

;swap rows 1 and 2
Swap1W2 proc
mov si, offset matrix
mov di, offset matrix+4
mov cx, 3
rowSwap:
mov bx, [si]
xchg bx, [di]
mov [si], bx
add si, 2
add di, 2
loop rowSwap
Swap1W2 endp

end main

Hmm,

How sure are you that the Crlf routine will NOT trash the contents of ax?
After this.... you're not going to do a DisplayMatrix? Swap1W2 isn't going to display the matrix...


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