CS271 assignment02.asm

assignment02.asm

TITLE Assignment 02    (huddya_assignment02.asm)

; Author: Addison Huddy
; Course / Project ID  CS271 / Assignment 2         Date: Oct 19, 2014
; Description:      1. Getting the user's name
;                   2. Displaying the user's name
;                   3. User enters the number of Fibonacci numbers they want
;                   4. Validates the input from the user
;                   5. Loops through to calculate Fibonacci numbers
;                   6. Displays Fibonacci numbers in groups of 5 per line
;                   7. Says goodbye to the user

INCLUDE Irvine32.inc
; (insert constant definitions here)

MAXFIB EQU 46 ;the maxinum number of fibanacci numbers the program can generate

.data
splash          BYTE "Lets count some fibonacci numbers by Addison Huddy", 0
namePrompt      BYTE "Please enter your name: ", 0
welcomeMessage  BYTE "Welcome, ", 0
numberPrompt    BYTE "Enter the number of fibonacci numbers to display (1 to 46): ", 0
numberError     BYTE "Please make sure to enter a number 1 to 46, inclusive. Try again: ", 0
goodByeMessage  BYTE "Thanks for hanging out. Goodbye ", 0
spacing         BYTE "     ", 0 ;this variable will provide easy access to spacing between numbers

; .data? ; some reason this was throughing a weird error
userName        DWORD 32 DUP(0) ; for storing the user's name
userNum         DWORD ? ; how many fib numbers they want to display
oldSum          DWORD ? ; this is needed to store the last sum
column          DWORD ? ; needed for incrementing through 5 columns

.code
main PROC
; ********************* Greet the user and get her name **********************

  ; splash message
  mov edx, OFFSET splash
  call WriteString
  call CrLf

  ; prompt user to enter in name and read it into userName
  mov edx, OFFSET namePrompt
  call WriteString
  mov edx, OFFSET userName
  mov ecx, SIZEOF userName
  call ReadString

  ; welcome the user
  mov edx, OFFSET welcomeMessage
  call WriteString
  mov edx, OFFSET userName
  call WriteString
  call CrLf

; *********************    Get fib numbers and check    **********************

  ; set of the user instructions
  mov edx, OFFSET numberPrompt
  call WriteString

  getUserNum:
    call ReadInt
    cmp eax, 1
    jl userError
    cmp eax, MAXFIB
    jg userError
    jmp goodUserNum

  ; prompting the user to enter in a good fib number
  userError:
    mov edx, OFFSET numberError
    call WriteString
    jmp getUserNum

  ; setting the fib number
  goodUserNum:
    mov userNum, eax
    call CrLf

; *********************    Get fib numbers and check    **********************

  ; first need to set everything up for the for loop
  mov ecx, userNum
  mov eax, 0
  mov ebx, 1
  mov oldSum, 0 ; starting a 0. It ensures that we get a proper fib sequence. 0 1 1 2 3 5 8 13 21
  mov column, 1

  ; main loop for iterating through fib numbers
  forLoop:
    mov oldSum, eax ; storing off the old sum
    add eax, ebx ; adding the old sum to the new
    mov ebx, oldSum ; getting the old sum to be ready for the next round
    call WriteDec ; print what was recently added ans stored in eax
    mov edx, OFFSET spacing
    call WriteString

    cmp column, 5 ; checking if a new line should be returned after 5 numbers to display
    je yesReturn
    jnz noReturn

    yesReturn:
      call CrLf ; new line after five numbers (e.g. columns)
      mov column, 0

    noReturn:
      mov edx, column
      inc edx
      mov column, edx

  loop forLoop


; *********************      Say goodbye to the user    **********************


  call CrLf
  mov edx, OFFSET goodByeMessage
  call WriteString
  mov edx, OFFSET userName
  call WriteString
  call CrLf

	exit	; exit to operating system
main ENDP

; (insert additional procedures here)

END main