Division by 0

[sirvo]

What happens when pic divides a number by 0?

( I could'n find any thread about that.. )

Thanks.

[Darrel Taylor]

> What happens when PBP divides a number by 0?

That depends on how you are using them.

If you have BYTE sized variables, and are returning the result to a byte sized variable, the result is 255.

A  VAR BYTE
B  VAR BYTE
C  VAR BYTE

A = 100
B = 0
C = A / B

LCDOUT dec C

; Displays 255

If the result is being returned to a Word variable, the result will be 65535.

A  VAR BYTE
B  VAR BYTE
C  VAR WORD

A = 100
B = 0
C = A / B

LCDOUT dec C

; Displays 65535

And if the division is done inside another formula or Statement like LCDOUT, the result is assumed to be word sized, and the result will be 65535 ...

A  VAR BYTE
B  VAR BYTE

A = 100
B = 0

LCDOUT dec (A / B)

; displays 65535, even though the variables are Byte sized.

For word variables, the result will always be 65535

And finally, if the zero is in a constant expression, the compiler will flag an error

LCDOUT $FE,$C0, dec 100/0

; Compiler error: Divide by zero while constant folding.

HTH,

[sirvo]

Thanks again Darrel. There could not be a better explanation.

Another thing.. Man, these instant interrupts stuffs that you show us are pretty handy.. after using it I discover how usefull it is....

Regards.

[Darrel Taylor]

Thanks again Darrel. There could not be a better explanation.

Thanks Sylvio,

I'm sure Melanie could have at least made it more interesting.

And, I'm glad you like the Instant Interrupts!
I might be a little biased, but I don't think I could write a decent program without them anymore.

Keep the questions coming.
They're good one's.
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