Create a program for NASM that calculates the following expression: answer = (A

Question

Create a program for NASM that calculates the following expression: answer = (A + B) - (C + D) The answer must be stored in a variable of the correct data type given your data ( A, B, C, D) Values for your data ( A, B, C, D) must be stored in registers, not variables You must supply the initial values for the data ( A, B, C, D) Create a string that could accompany the answer in an output statement (example: The answer is:) ( you do not have to output the string) Comment on each line of code in NASM

Explanation / Answer

Solution :

NASM Program that calculates the given expression : answer = (A+B) - (C+D)

.data

A DWORD 200

B DWORD 300

C DWORD 400

D DWORD 500

Main PROC

; we will save integer values for the registers

mov nax, A ; NAX = 200

mov nbx , B ; NBX = 300

mov ncx , C ; NCX = 400

mov ndx , D ; NDX = 500

;We will calculate the value of the given expression

add nax,nbx ;NAX :(A+B)

add ncx,ndx ; NCX: (C+D)

sub nax,ncx ; NAX :(A+B) -(C+D)

move A,nax ; A =(A+B)-(C+D)

exit

main ENDP

END main

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