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divide overflow???

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Join Date: Apr 2005

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ghostfacelz ghostfacelz is offline

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divide overflow???

Apr 18th, 2005

hi... ive tried alot of things already...and i know what the problem is, just not sure how to fix it.
ive isolated it to this part of the code thats giving me problems... and i think that its because the register cant hold the number (hence the overflow error)

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        MOV AX, number		;for division
	MOV CX, 2d		;''
	DIV CX			; AX (number) / CX (2) = n/2 in ax
	INC AX			;so now its n/2 +1
	MOV countmax, AX	;store max var.
        MOV AX, number		;for division
	MOV CX, 2d		;''
	DIV CX			; AX (number) / CX (2) = n/2 in ax
	INC AX			;so now its n/2 +1
	MOV countmax, AX	;store max var.

number will be from 100-999

since my div skills arent that great...what is the best way to divide something? my book isnt very helpful.
thanks
-g

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Join Date: Sep 2005

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bighorse

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Re: divide overflow???

Sep 14th, 2005

when we do "div",there some rules we must abide by.
1.8 digits "div",like
mov bh,1
mov ax,11
div bh
send the quotient to al, and send the arithmetical complimentremainder to ah
2. 16 digits "div",like
mov bx,11
mov ax,3223
div bx
send the quotient to ax, and send the arithmetical complimentremainder to dx
so, if the quotient lager than al in 8 digits "div" and larger than ax in 16 digits "div", system will call 0 interrupt, and display "Divide overflow"