Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
  • Print first 2 Fib values (0, 1) before starting
    • These are hard-coded since they are starting values...no calculations required
  • Enter MainLoop
    • Loop and call subroutines to calculate each subsequent value in the sequence
    • Exit the loop once all single-digit values in the sequence have been printed
  • USE 3 subroutines
    • calcNextFib Uses R1 and R2 to calc next value in Fibonacci sequence
    • printNum Outputs single-digit number to the display
    • printCommaSpace Outputs a comma and a spaceCalculate all the single-digit Fibonacci numbers in order
    • Start with the first 2 values in the sequence (0, 1)
    • Calculate the next value by adding together the two largest values
  • Print each number in the sequence
    • With a comma and space after each
    • No comma after the last number
  • Use LC-3 I/O device to print number, commas, and spaces
    • NO numbers printed using Trap Routine
    • should check ddr, dsr , load and store

modify the code to work using ALL Guidelines

For each Calculation:

; Fib2 = Fib1 + Fib2 ; Fib1 = previous Fib2

; R0 used for PUTS messages

; R1 contains current Fib1 value

; R2 contains current Fib2 value

; R6 is loop counter for main loop

; R7 is not used by this program. Used by Simulate for TRAP and Subroutines

.ORIG x3000

Setup

LEA R0, Info

PUTS

ADD R6, R6, #5; Init Main Loop counter (loop 5 times)

;Print first 2 Fib values before starting

;----- Your Code Here -----;

;----- End Your Code Here -----;

;Loop and call subroutines to calculate each subsequent value in the sequence

;Exit the loop once all single-digit values in the sequence have been printed

MainLoop

;----- Your Code Here -----;

;----- End Your Code Here -----;

Done

HALT

;----------------------------------- ;Subroutines ;-----------------------------------

;Uses R1 and R2 to calc next value in Fibonacci sequence

;When complete, Fib2 (R2) will contain the new Fib number

;and Fib1 (R1) will contain the previous value of Fib2 (R2)

calcNextFib

;----- Your Code Here -----;

;----- End Your Code Here -----;

RET

;Outputs single-digit number to the display

;R2 contains number to

print printNum

;----- Your Code Here -----;

;----- End Your Code Here -----;

RET

;Outputs a comma and a space

;No data is passed in and no data is returned

printCommaSpace

;----- Your Code Here -----;

;----- End Your Code Here -----;

RET

;End of Program

;Data Declarations-------------

DSR .FILL xFE04

DDR .FILL xFE06

Info .STRINGZ "This program will print the first 6 characters of the Fibboncci Sequence\n"

ASCIIOFSET .FILL x0030

NegASCIIOFSET .FILL xFFD0

ASCIINewline .FILL x000d ; Newline ascii code

ASCIISpace .FILL x0020 ; Space ascii code

ASCIIComma .FILL x002C ; Comma ascii code

; Memory slots for subrountines to store/restore registers

; You may or may not need to use all of these

SaveR3 .BLKW 1

SaveR4 .BLKW 1

SaveR5 .BLKW 1

SaveR6 .BLKW 1 .

.END

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