Assembly/asm_Q3 at main · omerid/Assembly · GitHub

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INCLUDE Irvine32.inc

;Submit by: Omer Idel, ID: 203347794
;This Program get a number from user and return
;his Collatz value
;f(n)= 0 if n=1, 1+f(n/2) if n > 1 is even, 1+f(3n+1) id n > 1 is odd

.data
MyName	BYTE "Omer Idel, ID: 203347794", 10, 13, 0
EnterA	BYTE "Please enter a number: ", 10, 13, 0
Res		BYTE "The collatz value is: ", 10, 13, 0
count	WORD 0

.code
my_main PROC
	mov		edx, offset MyName
	call	WriteString

	mov		edx, offset EnterA
	call	WriteString

	call	ReadInt
	push	eax
    call	Collatz

	mov		edx, offset Res
	call	WriteString

	call	WriteDec
	call	exitProcess

my_main ENDP


;------------------------------------------------------------
;This is the collatz function
;input: number (2 Bytes)
;output: ax - the collatz value
;------------------------------------------------------------
Collatz PROC
	push	ebp
	mov		ebp, esp
	push	ecx
	push	edx

	xor		eax, eax

    mov     ax, word ptr [ebp + 8]
    shr     ax, 1 ;check if even or not
    jnc     EvenNum ;if even
	jmp		OddNum ;else
	jmp     EndCollatz

OddNum:
    cmp     word ptr [ebp + 8], 1 ;checking the stop conditions
    je      EndCollatz
    mov     ax, word ptr [ebp + 8]
    mov     ecx, 3
    mul     ecx
    inc     ax
    inc     Count
    push    ax
    call    Collatz
    jmp     EndCollatz

EvenNum:
    cmp     word ptr [ebp + 8], 1 ; checking the stop conditions
    je      EndCollatz
    mov     ax, word ptr [ebp + 8]
    mov     ecx, 2
    xor     edx, edx
    div     ecx
    inc     Count
    push    ax
    call    Collatz


EndCollatz:
	mov		ax, count
    pop		edx
    pop		ecx
    mov		esp, ebp
    pop		ebp
    ret		2

Collatz ENDP

END my_main