biggest of 3 numbers

[Michael Mair]

Groovy hepcat Sundar was jivin' on 4 May 2006 06:07:26 -0700 in
comp.lang.c.
Re: biggest of 3 numbers's a cool scene! Dig it!


So does division of an int by a smaller int large enough to cause a
value of magnitude less than 1, such as 8/7 or 32/17.

Could you please explain that?
I would have expected a "round-down behaviour for negative
results" argument but I fail to see how 8/7 <= 1 in C.
Maybe it's just my not having had my caffeine fix yet...


Cheers
Michael

 

[Michael Mair]

What's 32760 - (-32760)?

65520, right?

Or maybe it's -10.

ITYM -0x10 or -16

Cheers
Michael

 

[Jordan Abel]

ITYM -0x10 or -16

Or it could be -10. or 42. But that is what I meant.

 

[Dik T. Winter]

> Dik T. Winter wrote: ....
>
> nice peace of code, got me a while that it comes from:
> max(a,b) = (a + b + abs(a - b))/2
>
> but using this the comparison is simple hidden in the
> abs statement, where a number is compared to zero.

Well, assuming those are ints:

unsigned int abs(int n)
{
unsigned int x = n;
unsigned int m;

m = (1 << (sizeof(int) - 1)) & x;
m = (m - (m >> 31)) | m;
return (x ^ m) + (1 & m);
}

Where is the comparison? But, whatever, abs is standard already in C89,
and I have no idea how it is implemented... But of course, there is
the probability of overflow lurking in that formula.

 

[Richard Bos]

Groovy hepcat vim was jivin' on 4 May 2006 04:48:13 -0700 in


And your C question is...?
Find the bigger of three numbers by finding the bigger of two
numbers, one of which is itself the bigger of two numbers. Find the
bigger of two numbers by subtracting one from the other and
determining whether the result is greater than zero or not.

#define BIGGER_OF_TWO(x,y) ((x) - (y) > 0 ? (x) : (y))

0 is not a number these days?

Richard

 

[Flash Gordon]

0 is not a number these days?

It doesn't matter which you return if the difference is 0, and the
suggested expression will return one of the numbers in that case. So I
don't see your point.

 

[Dik T. Winter]

>
> Well, assuming those are ints:
>
> unsigned int abs(int n)
> {
> unsigned int x = n;
> unsigned int m;
>
> m = (1 << (sizeof(int) - 1)) & x;
> m = (m - (m >> 31)) | m;

Should have been
m = (m - (m >> (sizeof(int) - 1))) | m;

 

[Richard Bos]

It doesn't matter which you return if the difference is 0, and the
suggested expression will return one of the numbers in that case. So I
don't see your point.

The requirement was "without comparing numbers". (Ok, as written it was
"without comaprimg numbers", but...) Zero is a number. Comparing
something to zero falls under comparing numbers, and is therefore non
grata in this homework assignment.

Richard

 

[Flash Gordon]

The requirement was "without comparing numbers". (Ok, as written it was
"without comaprimg numbers", but...) Zero is a number. Comparing
something to zero falls under comparing numbers, and is therefore non
grata in this homework assignment.

OK, I missed the point you were making. I agree with you.
--
Flash Gordon, living in interesting times.
Web site - http://home.flash-gordon.me.uk/
comp.lang.c posting guidelines and intro:
http://clc-wiki.net/wiki/Intro_to_clc

Inviato da X-Privat.Org - Registrazione gratuita http://www.x-privat.org/join.php

 

[Peter Shaggy Haywood]

Groovy hepcat Michael Mair was jivin' on Sun, 07 May 2006 08:28:48
+0200 in comp.lang.c.
Re: biggest of 3 numbers's a cool scene! Dig it!

Could you please explain that?
I would have expected a "round-down behaviour for negative
results" argument but I fail to see how 8/7 <= 1 in C.
Maybe it's just my not having had my caffeine fix yet...

I don't know what I'm talking about. I really gotta get some sleep.
Well, that's my excuse anyhow, and I'm sticking to it.

--

Dig the even newer still, yet more improved, sig!

http://alphalink.com.au/~phaywood/
"Ain't I'm a dog?" - Ronny Self, Ain't I'm a Dog, written by G. Sherry & W. Walker.
I know it's not "technically correct" English; but since when was rock & roll "technically correct"?

 

[vim]

If u compare the result( subtraction of two numbers ) with 0.Then it it
violates the condition.
There should be no comparision