Write in 80x86 assembly language code. Comment each line of instruction. 1) Decl

Question

Write in 80x86 assembly language code. Comment each line of instruction.

1) Declare two arrays of size 5 and initialize the first one to odd numbers 1, 3, 5, 7 and 9. Initialize the second one to even numbers 2, 4, 6, 8 and 10. Add the corresponding elements of the two arrays and place the result into the third array called result.

2) Write a program to declare an array containing a string (character array). Write a function to check if this string is palindrome or not. The function should return 1 in al if it is palindrome. An example of palindrome string is racecar. Place zero in al if it is not palindrome.

Explanation / Answer

code 1:-

data segment
arr1 db 01h,03h,05h,07h,09h #declare odd array
arr2 db 02h,04h,06h,08h,10h #declare even std::array
arr3 db 5 dup (0) #declareresult array
data ends

code segment
assume cs:code , ds:data

start:

mov ax,data
mov ds,ax

lea si,arr1 #load arr1 into si
lea di,arr2 #load arr2 into di
lea bx,arr3 #load arr3 into bx

mov cl,5 #intialised c1 to the no. of elements of array

l1:
mov al,[si] #load arr1 into al
add al,[di] #add arr1+arr2
mov [bx],al #move the result into arr3 i.e. arr1+arr2 = bx
inc si #increament arr1 index
inc di #increament arr2 index
inc bx #increament arr3 index
dec cl #decreament c1
jnz l1 #loop

mov ah,4ch
int 21h
code ends
end start

code 2:-

DATA SEGMENT

BLOCK1 DB 'racecar'
MSG1 DB "IT IS PALINDROME $"
MSG2 DB "IT IS NOT PALINDROME $"
PAL DB 00H

DATA ENDS

PRINT MACRO MSG

MOV AH,09H
LEA DX,MSG
INT 21H
INT 3H

ENDM

EXTRA SEGMENT

BLOCK2 DB 7 DUP(?)
EXTRA ENDS

CODE SEGMENT
ASSUME CS:CODE,DS:DATA,ES:EXTRA
START: MOV AX,DATA
MOV DS,AX
MOV AX,EXTRA
MOV ES,AX
LEA SI,BLOCK1
LEA DI,BLOCK2+6
MOV CX,00007H
BACK: CLD
LODSB
STD
STOSB
LOOP BACK
LEA SI,BLOCK1
LEA DI,BLOCK2
MOV CX,0007H
CLD
REPZ CMPSB
JNZ SKIP
PRINT MSG1
SKIP: PRINT MSG2
CODE ENDS
END START

Output::-

C:TASM>debug AMPN7.exe
-g
IT IS PALINDROM

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