Assembly Programming Question:

Add 1 or several new lines of code to the program below and tell me where and what it was that you'd added.

; ASCII Addition (ASCII_add.asm)

; This program performs ASCII arithmetic on digit strings having

; implied fixed decimal points.

INCLUDE Irvine32.inc

DECIMAL_OFFSET = 5 ; offset from right of string

.data

decimal_one BYTE "100123456789765" ; 1001234567.89765

decimal_two BYTE "900402076502015" ; 9004020765.02015

sum BYTE (SIZEOF decimal_one + 1) DUP(0),0

.code

main PROC

; Start at the last digit position.

mov esi,SIZEOF decimal_one - 1

mov edi,SIZEOF decimal_one

mov ecx,SIZEOF decimal_one

mov bh,0 ; set carry value to zero

L1: mov ah,0 ; clear AH before addition

mov al,decimal_one[esi] ; get the first digit

add al,bh ; add the previous carry

aaa ; adjust the sum (AH = carry)

mov bh,ah ; save the carry in carry1

or bh,30h ; convert it to ASCII

add al,decimal_two[esi] ; add the second digit

aaa ; adjust the sum (AH = carry)

or bh,ah ; OR the carry with carry1

or bh,30h ; convert it to ASCII

or al,30h ; convert AL back to ASCII

mov sum[edi],al ; save it in the sum

dec esi ; back up one digit

dec edi

loop L1

mov sum[edi],bh ; save last carry digit

; Display the sum as a string.

mov edx,OFFSET sum

call WriteString

call Crlf

exit

main ENDP

END main