Fib Program2

TITLE Simple Calculations (Program1.asm)
;Author: Jared Hughes
;Email: hughesja@onid.oregonstate.edu
;Class#: CS271-400
;Program Assignment 2
;Due: 7/12/2015
;Description: This program will take string input from the user
;             Take in a number from the user
;             Validate user input
;             Calculate and display all Fibonacci numbers up to the number given by user
;             Display a good bye message to the user and terminate the program

INCLUDE Irvine32.inc

    UPPER = 46
    LOWER = 1
    STRINGMAX = 80

.data

    outsideRange    BYTE    "Out of range.  Please enter a number within (1 - 46).", 0
    myName          BYTE    "Fibonacci Numbers by Jared Hughes", 0
    explain         BYTE    "This program will take a number specified by you (n), and give the nth number in the Fibonacci sequence.", 0
    yourName        BYTE    "What is your name? ", 0
    helloU          BYTE    "Hello, ", 0
    good_bye        BYTE    "That's it!  See ya later, ", 0
    numberQ         BYTE    "Enter a number between 1 and 46 to calculate the Fibonacci sequence: ", 0
    ;userName       BYTE    STRINGMAX+1 DUP (?)
    fibNth          DWORD   ?
    sequence        BYTE    "Here is the Fibonacci sequence requested.", 0
    fib1            DWORD   0
    fib2            DWORD   1
    spaces          BYTE    "     "
    period          BYTE    "."
    sum             DWORD   ?
    stringIn        BYTE    STRINGMAX+1 DUP (?)

    ;fibArray       DWORD   46 DUP(?)

.code
main PROC

;introduction - Title of program and introductions of myself and the user

    mov edx, OFFSET myName              ;moves myName into the edx register
    call WriteString                    ;prints the string in the edx register to the console
    call CrLf                           ;newline (will not comment these last two lines out if they are repeated)
    mov edx, OFFSET yourName
    call WriteString
    mov edx, OFFSET stringIn
    mov ecx, STRINGMAX
    call ReadString                     ;read string in from user and null terminate it
    ;mov userName, OFFSET edx
    call CrLf
    mov edx, OFFSET helloU
    call WriteString
    mov edx, OFFSET stringIn
    call WriteString
    call Crlf

;userInstructions - Tell user about the program and what to do

    mov edx, OFFSET explain
    call WriteString
    call CrLf

;getUserData - Get number from user for fibonacci calculation

getData:

    mov edx, OFFSET numberQ
    call WriteString
    call ReadDec                        ;read in a decimal number from the user
    mov fibNth, eax

;Validate data from user input

    cmp eax, UPPER                      ;if number read in is higher than 46 jump to errormessage
    jg errorMessage
    cmp eax, LOWER                      ;if read dec is lower than 1, jump to errorMessage
    jl errorMessage
    jmp validationDone                  ;if number is valid, jump past error and continue program

errorMessage:

    mov edx, OFFSET outsideRange
    call WriteString
    call CrLf
    jmp getData

validationDone:

    mov edx, OFFSET sequence
    call WriteString
    call CrLf

;calculateFib - Calculate fibonacci numbers and display

    mov ecx, fibNth                     ;sets loop counter to number nth term user requested
    mov edx, 0                          ;sets edx counter to track how many terms per line

fibLoop:

    mov ebx, fib1
    mov eax, fib2
    cmp edx, 5                          ;compare edx counter to 5, if equal to 5 print to new line
    jne noNewLine                       ;if not equal to 5 jump to next dec print statement
    call CrLf
    mov edx, 0                          ;reset edx counter to 0

noNewLine:
    call WriteDec
    push edx                            ;push edx onto stack to allow use of edx for string
    mov edx, OFFSET spaces
    call WriteString
    pop edx                             ;pop edx from stack and increment counter for next loop iteration
    inc edx
    add ebx, eax                        ;add the two terms together to get the next Fib number
    mov fib2, ebx
    mov fib1, eax

    loop fibLoop                        ;loop if ecx > 0

;farewell: say goodbye to the user

    call CrLf
    mov edx, OFFSET good_bye            ; say goodbye
    call WriteString
    mov edx, OFFSET stringIn            ;insert user name into goodbye
    call WriteString
    mov edx, OFFSET period              ;insert period at end of sentence
    call WriteString
    call CrLf

    exit    ;exits to OS
main ENDP
END main