exercise1

.model flat, stdcall
ExitProcess PROTO, dwExitCode:DWORD

.data
	.data
	sum DWORD 0				;sum init as 0
	n DWORD 999				; n is 10
	iter DWORD 0
	arg DWORD 0
	    		
.code
main PROC
	mov ecx, n
	loop1:
	mov iter,ecx
	mov eax, iter
	mov arg, eax
	call isdivby ; ebx is 0 if not div 3/5 and 1 if div by 3/5
	cmp ebx,0
	je else1
	mov eax, iter
	mov arg, eax
	call sum3
	else1:
	loop loop1
	mov ebx,sum
	invoke ExitProcess, ebx
invoke ExitProcess, eax ; if the program runs successfully the final message in the Debug output will be: "...exited with code 5 (0x5)"
main ENDP

isdivby PROC
	mov eax, arg
	mov edx,0 ;edx needs to be 0
	mov ebx,3
	div ebx
	cmp edx,0 ;check if it is divisible by 3
	je true
	mov eax, arg
	mov edx,0 ;edx needs to be 0
	mov ebx,5
	div ebx
	cmp edx,0 ;check if it is divisible by 5
	je true
	mov ebx,0
	ret 
	true:
	mov ebx,1
	ret
isdivby ENDP

sum3 PROC
	mov ebx, arg
	mov eax, sum
	add eax, ebx
	mov sum, eax
	ret
sum3 ENDP
END