TITLE SumArray1.asm
; P. 141
;
; Last update: 11/30/17

INCLUDE Irvine32.inc
.data
array DWORD 100, 200, 300
;theSum DWORD ?

.code
main PROC
	MOV ESI, offset array
	MOV ECX, lengthof array
	call ArraySum
	
;	mov theSum, EAX

	call writeDec
	call crlf
	exit
main ENDP

; procedure, P.141
ArraySum PROC USES ESI ECX
	; pre-cond: [ESI] holds the first ele. of array
	; post-cond: EAX holds the sum of array ele.

	mov EAX, 0
L1:
	ADD EAX, [ESI]
	ADD ESI, TYPE DWORD
	LOOP L1

   	RET
ArraySum ENDP

END main