Create a procedure named FindThrees that returns 1 if an array has three consecu

Question

Create a procedure named FindThrees that returns 1 if an array has three consecutive values of 3 somewhere in the array. Otherwise, return 0. The procedure’s input parameter list contains a pointer to the array and the array’s size. Use the PROC directive with a parameter list when declaring the procedure. Preserve all registers (except EAX) that are modified by the procedure. Write a test program that calls FindThrees several times with different arrays.

Here is what I have so far,

;Create procedure name FindThrees
INCLUDE Irvine32.inc
;FindThrees PROTO,
;pointerArr: PTR DWORD,
;ArrLeng:DWORD

.data
;strContains BYTE "The array has three consecutive 3.",0
;strNotContain BYTE "The array does not contain three consecutive 3.",0
;arrOne BYTE 1, 2, 3, 2
;arrTwo BYTE 3, 3, 5, 7, 3
;arrThree BYTE 4, 3, 3, 3, 1, 8

.code
main PROC

; calls the procedures
call Clrscr ; clears the screen
; find if the array arrOne contains three consecutive 3
INVOKE FindThrees, ADDR arrOne, LENGTHOF arrOne
.IF eax == 1
mov edx,OFFSET strContains
call WriteString ; writes strContains
call Crlf
.ELSE
mov edx,OFFSET strNotContain
call WriteString ; writes strNotContain
call Crlf
.ENDIF

; find if the array arrTwo contains three consecutive 3
INVOKE FindThrees, ADDR arrTwo, LENGTHOF arrTwo
.IF eax == 1
mov edx,OFFSET strContains
call WriteString ; writes strContains
call Crlf
.ELSE
mov edx,OFFSET strNotContain
call WriteString ; writes strNotContain
call Crlf
.ENDIF

; find if the array arrThree contains three consecutive 3
INVOKE FindThrees, ADDR arrThree, LENGTHOF arrThree
.IF eax == 1
mov edx,OFFSET strContains
call WriteString ; writes strContains
call Crlf
.ELSE
mov edx,OFFSET strNotContain
call WriteString ; writes strNotContain
call Crlf
.ENDIF
exit
main ENDP
FindThrees PROC USES esi ecx,
pointerArr: PTR DWORD, ; points the array
ArrLeng: DWORD ; the length of array
; finds if the array contains three consecutive 3 as its values
; Receives: pointer to array and the length of array
; Returns: EAX = 1 (true) or 0 (false)
mov eax,0 ; initialize EAX = 0
mov esi,pointerArr ; ESI is the pointer to array
mov ecx,ArrLeng
sub ecx,2 ; as next 2 elements were observed
L1:
.IF [esi] == 3
.IF [esi+1] == 3
.IF [esi+2] == 3
mov eax,1 ; set EAX = 1
jmp L2
.ENDIF
.ENDIF
.ENDIF
inc esi ;Increment ESI
loop L1
L2:
ret ; returns EAX
FindThrees ENDP

END main

Explanation / Answer

Hi,

Please find the updated code for inlcuding comments and output of the code below:-

CODE:-

======================================================================

;Create procedure name FindThrees

INCLUDE Irvine32.inc

FindThrees PROTO,

pointerArr: PTR DWORD,

ArrLeng:DWORD

.data

strContains BYTE "The array has three consecutive 3.",0

strNotContain BYTE "The array does not contain three consecutive

3.",0

strdisplay "The four arrays results are:-",0

arrOne BYTE 1, 2, 3, 2

arrTwo BYTE 3, 3, 5, 7, 3

arrThree BYTE 4, 3, 3, 3, 1, 8

arrFour BYTE 5,6,3,3,3,2,1,1

.code

main PROC

; calls the procedures

call Clrscr    ; clears the screen

; find if the array arrOne contains three consecutive 3

move edx OFFSET strdisplay

INVOKE FindThrees, ADDR arrOne, LENGTHOF arrOne

.IF eax == 1

mov edx,OFFSET strContains

; writes strContains which will display if array contains consecutive 3's.

call WriteString  

call Crlf

.ELSE

mov edx,OFFSET strNotContain

; writes strContains which will display if array does not contains consecutive 3's.

call WriteString

call Crlf

.ENDIF

; find if the array arrTwo contains three consecutive 3

INVOKE FindThrees, ADDR arrTwo, LENGTHOF arrTwo

.IF eax == 1

mov edx,OFFSET strContains

; writes strContains which will display if array contains consecutive 3's.

call WriteString  

call Crlf

.ELSE

mov edx,OFFSET strNotContain

; writes strContains which will display if array does not contains consecutive 3's.

call WriteString  

call Crlf

.ENDIF

; find if the array arrThree contains three consecutive 3

INVOKE FindThrees, ADDR arrThree, LENGTHOF arrThree

.IF eax == 1

mov edx,OFFSET strContains

; writes strContains which will display if array contains consecutive 3's.

call WriteString

call Crlf

.ELSE

mov edx,OFFSET strNotContain

; writes strContains which will display if array does not contains consecutive 3's.

call WriteString  

call Crlf

.ENDIF

; find if the array arrFour contains three consecutive 3

INVOKE FindThrees, ADDR arrFour, LENGTHOF arrFour

.IF eax == 1

mov edx,OFFSET strContains

; writes strContains which will display if array contains consecutive 3's.

call WriteString

call Crlf

.ELSE

mov edx,OFFSET strNotContain

; writes strContains which will display if array does not contains consecutive 3's.

call WriteString  

call Crlf

.ENDIF

exit

main ENDP

;The body of the procedure FindThrees.

FindThrees PROC USES esi ecx,

pointerArr: PTR DWORD,   ; points the array

ArrLeng: DWORD    ; the length of array

; finds if the array contains three consecutive 3 as its values

; Receives: pointer to array and the length of array

; Returns: EAX = 1 (true) or 0 (false)

; initialize EAX = 0

mov eax,0   

; ESI is the pointer to array

mov esi,pointerArr  

mov ecx,ArrLeng

; as next 2 elements were observed

sub ecx,2   

L1:

.IF [esi] == 3

.IF [esi+1] == 3

.IF [esi+2] == 3

; set the value of EAX = 1

mov eax,1

jmp L2

.ENDIF

.ENDIF

.ENDIF

;Increment ESI

inc esi    

loop L1

L2:

; returns EAX to main

ret  

FindThrees ENDP

END main

======================================================================

OUTPUT OF THE CODE IS:-

The four arrays results are:-

The array does not contain three consecutive 3.

The array does not contain three consecutive 3.

The array has three consecutive 3.

The array has three consecutive 3.

===================================================================================

Please let me know in case of clarification

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