Thread: I Can Prove That 2 + 2 = 5, And I Will!

how?

[insert heavy, heavy sigh, here]

Then please do

floating point to integer casting

2 + 2 = 5, for sufficiently large values of 2

2.4 (which is rounded down to 2)
+
2.4 (which is rounded down to 2)
=
4.8 (which is rounded up to 5)

2+2=6 dah....

2.4 (which is rounded down to 2)
+
2.4 (which is rounded down to 2)[/b]

If you casted those to ints beforehand, it wouldn't work?

Code:

#include <iostream>
#include <cmath>

int add(float* a, float* b)
{
****int c = ceil(*a + *b);
*****a = (int)*a;
*****b = (int)*b;
****return c;
}

int main()
{
****float a = 2.4;
****float b = 2.4;
****
****int c = add(&a, &b);
****
****std::cout << "a + b = c" << "\n";
****std::cout << a << " + " << b << " = " << c << "\n";
****
****return 0;
}

Already knew that

[insert heavy, heavy sigh, here]

[/b]

I concur

I get it though

Code:

int add(float* a, float* b)
{
****int c = ceil(*a + *b);
*****a = (int)*a;
*****b = (int)*b;
****return c;
}

OK...what's so special about saying that 2.4 + 2.4 rounded up to the nearest whole number is 5 (surprise)?

Yes, when you cast them to integers afterwards, they become 2, because they are rounded down, but that's a loss of data - as your compiler probably says - and consequently not the same value. So when you later print the sum:

Code:

std::cout << a << " + " << b << " = " << c << "\n";

You're printing out a sum different from the one add() actually carried out, i.e. a and b have changed values. I don't really get it. I suppose on dodgy calculators or something it might be a bit cooler.

I think I just killed the coolness and made myself look like a pretentious bastard. Hey, what's new.

Your using floats. Try turning 2 into a float in any language and you'll get 2.0

2.0 + 2.0 = 4.0

...where is the five?

it's a simple example
and so, the errors blindingly obvious

in a bigger program, it may be over looked

imagine a big program......that calculates wages......your wages.......

lol

Try turning 2 into a float in any language and you'll get 2.0[/b]

<strike>No you won&#39;t.</strike> I read that wrong. Yes you will.

in a bigger program, it may be over looked[/b]

Yeah, but you&#39;d be the world&#39;s worst typecaster. C-style casts in themselves are a bit dodgy, and you&#39;d be somehow kicking the compiler in the face to stop it from warning you.

imagine a big program......that calculates wages......your wages.......[/b]

On the other hand, if you mean my wages are going to go up because of some rounding errors, I&#39;m all for it. Viva la float&#33;

I object to the bbcode putting <?php on the box header

who do you think I am &#33;&#33;&#33;

Originally Posted by Lord

Then please do
[/b]

I&#39;m tired. I&#39;m going to bed. I&#39;ll do it later.

HA&#33;

I&#39;ll explain it tomorrow. You can book it. It&#39;s a done deal. Tomorrow&#33;

Originally Posted by Universal

I&#39;ll explain it tomorrow. You can book it. It&#39;s a done deal. Tomorrow&#33;
[/b]

Can I call you a liar if you don&#39;t?

Only if he doesn&#39;t have a really good excuse

This topic reminds me of the book &#39; 1984&#39; (great book).

Also, only the pope can prove 2+2=5.

Once again, Neruo has something anti-Pope or Christian to say.

And sure, 2 + 2 = 5 if they are both 2.4.

Why is this topic still going on? What&#39;s not to get?

Originally Posted by Ynot

[/b]

Yes. But see, you&#39;ve just done what I can do with text, except with more work. You&#39;ve haven&#39;t actually "made" 2 + 2 = 5 (which is impossible if we are allowing the 2&#39;s to represent two units and the 5 to represent five units). You&#39;ve basically just coded something which will display a "picture" showing 2 + 2 = 5.

Ta da:

2 + 2 = 5

Behold the magic of the characters " ". "2", "5", "+", and "=".