Question

Write a NASM program that does the following:

1) Asks the user to enter three numbers (each is a byte) A,B, and C

2) Adds up the numbers and stores the sum in variable D

3) Outputs the sum

Answer 1

NASM PROGRAM!

INCLUDE io.h

Cr EQU 0ah

Lf EQU 0dh

data SEGMENT

p_a DB cr, lf, 'Enter a: ',0

p_b DB lf, 'Enter b: ',0

p_c DB lf, 'Enter c: ',0

p_sum DB cr, lf, 'The sum is: ',0

p_avg DB cr, lf, 'The avg is: ',0

tmpstr DW 40 DUP (?)

data ENDS

code SEGMENT

ASSUME cs:code, ds:data

start: mov ax, data

mov ds, ax

;input a

output p_a

inputs tmpstr, 10

atoi tmpstr

mov dx, ax

;input b

output p_b

inputs tmpstr, 10

atoi tmpstr

add dx, ax

;input c

output p_c

inputs tmpstr, 10

atoi tmpstr

add dx, ax

;find and print sum

output p_sum

mov ax, dx

itoa tmpstr, ax

output tmpstr

;find and print average

output p_avg

cwd

mov cx, 3

idiv cx

itoa tmpstr, ax

output tmpstr

quit: mov al, 00h

mov ah, 4ch

int 21h

code ENDS

END start