assembly,output,sequence , How do I break the string in output into 2 parts in this assembly code

How do I break the string in output into 2 parts in this assembly code


Tag: assembly,output,sequence

So I want to break the break "The nth term in Fibonacci Series is " string into two:

"The " and "th term in Fibonacci Series is ", print the first string, then print the value of n (say using WriteInt), then print the second string.

But I can't seem to get the right output, any tips on how to break them into two?

This is my output now (let's say I entered 4 as input):

Display Fibonacci Series
Enter number of fibonacci series terms: 4
Fibonacci Series is
Sum of Fibnoacci Series = 4
Press any key to continue... 

How can I change it to this input that I want:

Display Fibonacci Series
Enter the number in fibonacci sequence number: 4
The 4th sequence in Fibonacci Series is
Press any key to continue... 

Also right now the formula in this code is fibonacci, how do I change it to new formula like this;

f(n-2)/2 + f(n-1) * 2

This is my code:


; insert variables here
  dPrevious DWORD 0   
    dCurrent  DWORD 1   
    dNext DWORD 1     
    dNumberOfTerms DWORD 0
    dSum DWORD 0
    msg1 BYTE "Enter the Fibonacci sequence number : ",0 ; A null-terminated string
    msg2a BYTE "The ", 0
    msg2b BYTE "th term in Fibonacci Series is ", 0
    msg3 BYTE "th term in Fibonacci Series is ", WriteString
    msg4 BYTE "Error: Fibonacci Series must have at least 2 numbers",0

; insert all executable statements here
main PROC
    mov edx, OFFSET msgFibonacciSeries  ; "Display Fibonacci Series and Sum of Fibonacci Series in Assembly Language "
    call WriteString                    ; Display a null-terminated string.
    call Crlf                           ; Writes an end-of-line sequence to the console window.

    mov edx, OFFSET msg1      ; "Enter Number of Fibonacci Series Terms : "
    call WriteString          ; Display a null-terminated string.
    call ReadInt              ; Input a 32-bit signed decimal integer
                              ; from the keyboard and save in EAX.
  mov dNumberOfTerms, eax

    mov ebx,dWords   
    cmp ebx,1                ; compare EBX and 1
  jle Error                ; jump if Less than or equal  (<=)

    mov edx, OFFSET msg2a     ; "Fibonacci Series is "
    call WriteString 
    mov edx, OFFSET msg2b        
    call Crlf                ; Writes an end-of-line sequence to the console window.

    mov eax,dPrevious
    call WriteDec            ; Display an unsigned 32-bit integer value
                             ; in EAX in decimal format. 

    call Crlf

    mov ecx,dNumberOfTerms    ; ECX  initialize with Number Of Terms
    sub ecx,2                 ; Exclude First Two Terms

    cmp ecx,0                 ; compare EBX and 0
  je showSum                ; jump if equal  (=)

    mov ebx,dPrevious
        add ebx,dCurrent
     mov dNext,ebx
    mov eax,DNext
     cmp ecx,1
         jne ffff
           ;add dSum,eax

       loop L1

    jmp next
    mov edx, OFFSET msg4     ; "Error: Fibonacci Series Contain at least 2 number of terms"
    call WriteString
     cmp eax,1         
    call Crlf
call WaitMsg    ; Displays a message and waits for a key to be pressed.
exit            ; The exit statement (indirectly) calls a predefined 
                ; MS-Windows function that halts the program.
main ENDP  ; The ENDP directive marks the end of the main procedure.
END main       ; The END directive marks the last line of the program to be assembled.


To split your message, make it into two data items:

msg2a BYTE "The ", 0
msg2b BYTE "th term in Fibonacci Series is ", 0

Then in the code:

mov edx, OFFSET msg2a     ; "Fibonacci Series is "
call WriteString 
; ...
; Code here to write out the value of `n`
; ...
mov edx, OFFSET msg2b        
call Crlf

This won't be so elegant if n is 1 or 2 because it will say, 1th or 2th. I will leave it as an exercise to fix that if you want to. You can break your message up further for that if needed. For example:

msg2a BYTE "The ", 0
msg2b BYTE "st", 0
msg2c BYTE "nd", 0
msg2d BYTE " term in Fibonacci Series is ", 0

And adjust according to the value of n.

As far as modifying the formula from f(n-1) + f(n-2) to f(n-1)*2 + f(n-2)/2, locate where where f(n-1) and f(n-2) are determined and use the fact that *2 is the same as a single bit shift left, and /2 is the same as a single bit shift right. It's left as another exercise. If you look things up, it should be quite simple. :)


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