What are you doing now?

GoinEasy9 · 01-17-2010, 10:54 AM

Quote:

thread title -- what are you doing now ??

My answer...Simply unsubscribing from thread. this thread started some where... keep on going and going.... to infinite ( may be ).

bye to all subscribers.

Exactly what happens when you unsubscibe from infinity?? Has thoughts that he might have jumped ship while going through a wormhole.

MTK358 · 01-17-2010, 11:12 AM

Quote:

Originally Posted by GrapefruiTgirl

But, any number divided by itself, = 1 doesn't it?

That's true with any other number, but think:

0 x 0 = 0
0 x 1 = 0
0 x 2 = 0
...

brianL · 01-17-2010, 11:24 AM

0/0 = 1
1/1 = 1
2/2 = 1

Jeebizz · 01-17-2010, 11:32 AM

Quote:

Originally Posted by brianL

0/0 = 1

Actually 0/0 is whats known as an indeterminate form, which means that whatever original equation you were working with can either be: factored to a more simple form before taking it's limit, or can be taken it's limit as is by using L'Hôpital's rule. Don't feel bad though, I am sure it has been ages since you have had Calculus.

MTK358 · 01-17-2010, 11:33 AM

Let's see how to divide. For example 10 / 2. You do this:

1 x 2 = 2
2 x 2 = 4
3 x 2 = 6
4 x 2 = 8
5 x 2 = 10

So the answer is 5. Now just try doing this with 0 / 0. You'll find that any answer works.

brianL · 01-17-2010, 11:40 AM

Quote:

Originally Posted by Jeebizz

Actually 0/0 is whats known as an indeterminate form, which means that whatever original equation you were working with can either be: factored to a more simple form before taking it's limit, or can be taken it's limit as is by using L'Hôpital's rule. Don't feel bad though, I am sure it has been ages since you have had Calculus.

I don't think we actually did any calculus in what were then called "Secondary Modern" schools in the UK (way, way, back).

Jeebizz · 01-17-2010, 11:43 AM

Quote:

Originally Posted by MTK358

Now just try doing this with 0 / 0. You'll find that any answer works.

Perhaps you have had classes beyond Calculus (I have yet to take Discrete Maths, Linear Algebra), so maybe in courses beyond Calculus I you can actually use the indeterminate form, if so please explain.

MTK358 · 01-17-2010, 01:01 PM

Quote:

Originally Posted by Jeebizz

Perhaps you have had classes beyond Calculus (I have yet to take Discrete Maths, Linear Algebra), so maybe in courses beyond Calculus I you can actually use the indeterminate form, if so please explain.

I actually don't know Calculus yet, that's just how I logically thought of it.

smeezekitty · 01-17-2010, 01:22 PM

Quote:

Originally Posted by MTK358

I actually don't know Calculus yet, that's just how I logically thought of it.

computer says 0/0 == 0.

MrCode · 01-17-2010, 02:00 PM

Quote:

computer says 0/0 == 0

I just get "Math operation error" in the bottom status bar with gcalctool.

xcalc just gives "nan".

Are you using the Windows Calculator (I ask because I notice you're posting from Vista)? I could swear that even that one has a divide-by-zero error message...

IMO all calc progs should return "nan" or "divide by zero error" or some variation if the user attempts to divide by zero, regardless of what the dividend (divisor?) is.

smeezekitty · 01-17-2010, 02:55 PM

Quote:

Originally Posted by MrCode

I just get "Math operation error" in the bottom status bar with gcalctool.

xcalc just gives "nan".

Are you using the Windows Calculator (I ask because I notice you're posting from Vista)? I could swear that even that one has a divide-by-zero error message...

IMO all calc progs should return "nan" or "divide by zero error" or some variation if the user attempts to divide by zero, regardless of what the dividend (divisor?) is.

Code:

echo void main(){printf("%d\n", 0/0);} > 0d0.c
gcc 0d0.c -o 0d0

should work on linux or windows with MingW.

MTK358 · 01-17-2010, 03:26 PM

Code:

bash-4.0$ cat test.c
#include <stdio.h>

int main() {
	printf("%d\n", 0/0);
}

bash-4.0$ gcc test.c -o 0d0
test.c: In function ‘main’:
test.c:4: warning: division by zero

I think most programs just look for division by zero and call it invalid no matter what.

Since the answer is undefined I doubt it would be useful in a program, anyway.

Dinithion · 01-17-2010, 03:26 PM

Quote:

Originally Posted by smeezekitty

Code:

echo void main(){printf("%d\n", 0/0);} > 0d0.c
gcc 0d0.c -o 0d0

should work on linux or windows with MingW.

Then your computer suck in math :P

After a copy-paste of your code i got both a warning during compilation, and a runtime-error while executing.

MTK358 · 01-17-2010, 03:30 PM

The example doesn't include stdio.h (required for printf()), and it's a bad idea to use "void main()", instead use "int main()".

Dinithion · 01-17-2010, 03:57 PM

I know, but smeezekitty claimed that this program would print 0