8086 program to determine subtraction of corresponding elements of two arrays

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In this program we will see how to subtract the contents of two different arrays.

Problem Statement

Write 8086 Assembly language program to subtract the contents to corresponding elements which are stored in two different arrays

Discussion

In this example there are two different arrays. The arrays are stored at location 501 onwards and 601 onwards. The size of these two arrays are stored at offset location 500. We are taking the array size to initialize the counter, then by using loops we are subtracting the elements one by one

Input

Address	Data
…	…
500	04
501	09
502	03
503	08
504	06
…	…
601	04
602	01
603	02
604	03
…	…

Flow Diagram

Program

    MOV SI, 500     ;Point Source index to 500
    MOV CL, [SI]    ;Load the array size into CL
    MOV CH, 00 ;Clear Upper half of CX
    INC SI   ;Increase SI register to point next location
    MOV DI, 601     ;Destination register points to 601
L1: MOV AL, [SI]    ;Load A with the data stored at SI
    SUB AL, [DI]    ;Subtract DI element from AL
    MOV [SI], AL    ;Store AL to SI address
    INC SI   ;SI Point to next location
    INC DI   ;DI Point to next location
    LOOP L1     ;Jump to L1 until the counter becomes 0
    HLT ;Terminate the program

Output

Address	Data
…	…
500	04
501	05
502	02
503	06
504	03
…	…

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