Edit this LC-3 program to make the user enter two numbers and add them This prog

Question

Edit this LC-3 program to make the user enter two numbers and add them

This program echoes a user's input.

; The code will begin in memory at the address
; specified by .orig <number>.

   .ORIG   x3000

START:
; clear all registers that we may use
   AND   R0, R0, 0
   AND   R1, R0, 0
   AND   R2, R0, 0
   AND   R3, R0, 0
   AND   R4, R0, 0
   AND   R5, R0, 0
   AND    R6, R0, 0
   AND   R7, R0, 0

; print out a greeting
   LEA   R0, GREETING
   PUTS

; get a user-entered character (result in R0)
; echo it back right away (otherwise it isn't visible)
   GETC
   PUTC

; store entered string (otherwise it may be overwritten)
   ST   R0, USERINPUT

; print out a newline and some other stuff
   LEA   R0, NEWLINE
   PUTS

; print out the user's input
   LD   R0, USERINPUT
   PUTC

; print out the rest of the sentance
   LEA   R0, USERSTRING
   PUTS

; stop the processor
   HALT

; data declarations follow below

; strings
GREETING:   .STRINGZ   "Welcome to the sample program. Please enter a letter: "
USERSTRING:   .STRINGZ   " <-- is the character you entered. "
NEWLINE:   .STRINGZ " --> ";

; variables
USERINPUT:   .FILL   0

; end of code
   .END

Explanation / Answer

LC-3 program to enter two numbers and add them:

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