Coding Horrors: You can gather all your technical debt into one easy framework!

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Coding Horrors: You can gather all your technical debt into one easy framework!

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gonadic io: Feb 16, 2011; >>=

qntm posted:

Python code:

def isEven(n):
    return True if n == 0 else isOdd(n - 1)

def isOdd(n):
    return False if n == 0 else isEven(n - 1)

the Peano approach

# ? May 14, 2015 13:57

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# ? May 25, 2024 05:34

omeg: Sep 3, 2012

code:

 * @parm notify_offset The byte offset in the page to use for unmap notification; -1 for none.

uint32_t notify_offset,

I too love magic parameter values.

# ? May 14, 2015 14:33

Hughlander: May 11, 2005

omeg posted:

code:

 * @parm notify_offset The byte offset in the page to use for unmap notification; -1 for none.

uint32_t notify_offset,

I too love magic parameter values.

I love an unsigned int having a signed magic number.

# ? May 14, 2015 15:52

ChickenWing: Jul 22, 2010

Biowarfare posted:

they were right though

no no no no no no no no no no no no no no no no no no no no no :psyboom:

# ? May 14, 2015 16:14

canis minor: May 4, 2011

ChickenWing posted:

no no no no no no no no no no no no no no no no no no no no no

My next favourite thing, after JS/Java, is - "Have you programmed in MVC? How many applications have you written in MVC?"

(it might be pedantic, but MVC is not a programming language, goddamit)

canis minor fucked around with this message at 16:20 on May 14, 2015

# ? May 14, 2015 16:18

Polio Vax Scene: Apr 5, 2009

I'm an expert in Microsoft.

Excel?

No, Microsoft.

# ? May 14, 2015 16:39

New Yorp New Yorp: Jul 18, 2003; Only in Kenya.; Pillbug

Manslaughter posted:

I'm an expert in Microsoft.

Excel?

No, Microsoft.

My Adobe doesn't work.

# ? May 14, 2015 17:08

Polio Vax Scene: Apr 5, 2009

Maybe you should pay it a living wage.

# ? May 14, 2015 17:10

FlapYoJacks: Feb 12, 2009

Ithaqua posted:

My Adobe doesn't work.

It only works on java se 6.dailyReleaseBuild32.4

# ? May 14, 2015 17:15

1337JiveTurkey: Feb 17, 2005

Manslaughter posted:

I'm an expert in Microsoft.

Excel?

No, Microsoft.

I'm such an expert in Microsoft that my email's BillyGIsMyHomeboy@microsoft.com

# ? May 14, 2015 17:25

Pavlov: Oct 21, 2012; I've long been fascinated with how the alt-right develops elaborate and obscure dog whistles to try to communicate their meaning without having to say it out loud
Stepan Andreyevich Bandera being the most prominent example of that

QuarkJets posted:

I really liked Julia a lot until I started using Python's Numba module

Is numba any good? I feel like it's trying to do something to python that python just wasn't built to do.

# ? May 14, 2015 17:29

zergstain: Dec 15, 2005

Dr. Stab posted:

code:

for(int i = INT_MIN; i<INT_MAX; i+=2){
    if (n == i) return true;		
}

I love how that will overflow if n is odd.

# ? May 14, 2015 18:04

Space Kablooey: May 6, 2009

zergstain posted:

I love how that will overflow if n is odd.

code:

//isOdd
try{
 for(int i = INT_MIN; i<INT_MAX; i+=2) {}
} catch(OverflowException e) {
 return true;
}
return false;

# ? May 14, 2015 18:36

Dessert Rose: May 17, 2004; awoken in control of a lucid deep dream...

zergstain posted:

I love how that will overflow if n is odd.

My favorite part is just what the gently caress is it even doing?

# ? May 14, 2015 18:41

HappyHippo: Nov 19, 2003; Do you have an Air Miles Card?

code:

return (n & 0x0001) == 0

or maybe

code:

return (n >> 1 << 1) == n

HappyHippo fucked around with this message at 19:03 on May 14, 2015

# ? May 14, 2015 19:00

Ruzihm: Aug 11, 2010; Group up and push mid, proletariat!

HappyHippo posted:

code:

return (n >> 1 << 1) == n

I like this one!

# ? May 14, 2015 19:17

No Safe Word: Feb 26, 2005

ratbert90 posted:

It only works on java se 6.dailyReleaseBuild32.4

There is hardware I work with that has management software that only runs with Java 6 on IE 8 in Windows XP.

Not kidding.

# ? May 14, 2015 19:19

Blotto Skorzany: Nov 7, 2008; He's a PSoC, loose and runnin'
came the whisper from each lip
And he's here to do some business with
the bad ADC on his chip
bad ADC on his chiiiiip

HardDisk posted:

code:

//isOdd
try{
 for(int i = INT_MIN; i<INT_MAX; i+=2) {}
} catch(OverflowException e) {
 return true;
}
return false;

Since signed integer overflow doesn't cause an exception anywhere that has INT_MIN rather than something like Integer.MIN_VALUE, that's still going to misbehave when n is odd. It's left as an exercise to the reader to determine whether the loop doesn't terminate in that case or gives the wrong answer.

# ? May 14, 2015 19:26

Plorkyeran: Mar 22, 2007; To Escape The Shackles Of The Old Forums, We Must Reject The Tribal Negativity He Endorsed

Obviously there's an implied #define int boost::multiprecision::number<boost::multiprecision::cpp_int_backend<32, 32, boost::multiprecision::signed_magnitude, boost::multiprecision::checked>> and #define OverflowException std::overflow_error first.

# ? May 14, 2015 19:38

Van Kraken: Feb 13, 2012

code:

def isEven(x):
    return abs(x) in range(0, abs(x) + 1, 2)

In Python 3 this is O(1), because range now has a custom __contains__ method and doesn't have to test every value to check for inclusion.

# ? May 14, 2015 19:46

Space Kablooey: May 6, 2009

Blotto Skorzany posted:

Since signed integer overflow doesn't cause an exception anywhere that has INT_MIN rather than something like Integer.MIN_VALUE, that's still going to misbehave when n is odd. It's left as an exercise to the reader to determine whether the loop doesn't terminate in that case or gives the wrong answer.

What plorky said.

I thought the code was C# for some reason and didn't notice that it wasn't Integer.MIN_VALUE until now.

Or whatever it is in C#

Space Kablooey fucked around with this message at 19:53 on May 14, 2015

# ? May 14, 2015 19:50

The MUMPSorceress: Jan 6, 2012; ^SHTPSTS; Gary’s Answer

code:

;isodd
n(n)
n nn
q n#(+nn+(1=1*2))

The MUMPSorceress fucked around with this message at 20:28 on May 14, 2015

# ? May 14, 2015 20:17

Linear Zoetrope: Nov 28, 2011; A hero must cook

code:

func IsOdd(n int) bool {
    fmt.Printf("Is %d odd?\n", n)
    var b bool
    fmt.Scanln(&b)

    return b
}

# ? May 14, 2015 20:34

Fergus Mac Roich: Nov 5, 2008; Soiled Meat

qntm posted:

Python code:

def isEven(n):
    return True if n == 0 else isOdd(n - 1)

def isOdd(n):
    return False if n == 0 else isEven(n - 1)

This one is a lot of fun, I like it.

# ? May 14, 2015 20:36

HappyHippo: Nov 19, 2003; Do you have an Air Miles Card?

Jsor posted:

code:

func IsOdd(n int) bool {
    fmt.Printf("Is %d odd?\n", n)
    var b bool
    fmt.Scanln(&b)

    return b
}

Had a good laugh at this one

# ? May 14, 2015 20:46

Munkeymon: Aug 14, 2003; Motherfucker's got an
armor-piercing crowbar! Rigoddamndicu𝜆ous.

HappyHippo posted:

code:

return (n >> 1 << 1) == n

Try that with 2147483648 (2³¹) in JS.

# ? May 14, 2015 20:54

Qwertycoatl: Dec 31, 2008

code:

unsigned int is_even(unsigned int x)
{
    for (unsigned int i = 0; i < x; i++) {
        x *= x;
    }
    return !x;
}

# ? May 14, 2015 23:04

VikingofRock: Aug 24, 2008

Munkeymon posted:

Try that with 2147483648 (2³¹) in JS.

Wait, why does the right shift become negative?

# ? May 14, 2015 23:14

Linear Zoetrope: Nov 28, 2011; A hero must cook

VikingofRock posted:

Wait, why does the right shift become negative?

Maybe it secretly executes a "mul 2" instead of something like shift right??

# ? May 14, 2015 23:32

Vanadium: Jan 8, 2005

a right shift should probably make it do "div 2" and not "mul"

It's probably because 2<<31 is one past the biggest value you can fit into a signed 32bit int and the bitshifts work in terms of 32bit ints so it gets cast to one and it overflows and is suddenly int_min?

# ? May 14, 2015 23:36

Subjunctive: Sep 12, 2006; ✨sparkle and shine✨

Vanadium posted:

a right shift should probably make it do "div 2" and not "mul"

It's probably because 2<<31 is one past the biggest value you can fit into a signed 32bit int and the bitshifts work in terms of 32bit ints so it gets cast to one and it overflows and is suddenly int_min?

Yeah, it's two's-complement representation. MDN's bitwise operators page may be helpful in working it out.

# ? May 14, 2015 23:47

Linear Zoetrope: Nov 28, 2011; A hero must cook

Vanadium posted:

a right shift should probably make it do "div 2" and not "mul"

Er, derp. Not sure how I made that mistake

# ? May 14, 2015 23:51

IT BEGINS: Jan 15, 2009; I don't know how to make analogies

I was digging for a bug today that was affecting a part of our invoicing system. The thing that grouped invoices together wasn't properly updating the totals, and every group of invoices was getting $0 as a total.

I ask the dev responsible for writing this code a couple years ago if he's seen the issue:

quote:

Have you seen this before?
Oh yeah it's happened before. We tried to debug it and couldn't figure it out.
Ok, what did you guys find?
We couldn't figure it out.
So how'd you solve it?
Oh I wrote this function, invoices_update. It calculates the correct total amount

Can't find the bug? Just write a loving function to fix it afterwards! Genius!

# ? May 14, 2015 23:56

VikingofRock: Aug 24, 2008

Subjunctive posted:

Yeah, it's two's-complement representation. MDN's bitwise operators page may be helpful in working it out.

I'm still confused. From that link:

quote:

>> (Sign-propagating right shift)

This operator shifts the first operand the specified number of bits to the right. Excess bits shifted off to the right are discarded. Copies of the leftmost bit are shifted in from the left. Since the new leftmost bit has the same value as the previous leftmost bit, the sign bit (the leftmost bit) does not change. Hence the name "sign-propagating".

and yet:

JavaScript code:

 > 2147483648 >> 1
=> -1073741824

EDIT: Wait nevermind. 2^31 = 1000 0000 0000 0000 0000 0000 0000 0000, not 0100 0000 0000 0000 0000 0000 0000 0000. I get it now.

VikingofRock fucked around with this message at 00:07 on May 15, 2015

# ? May 14, 2015 23:58

rjmccall: Sep 7, 2007; no worries friend; Fun Shoe

VikingofRock posted:

I'm still confused. From that link:

and yet:
JavaScript code:
 > 2147483648 >> 1
=> -1073741824

ECMA-262 posted:

11.7.2 The Signed Right Shift Operator ( >> )
Performs a sign-filling bitwise right shift operation on the left operand by the amount specified by the right operand.
The production ShiftExpression : ShiftExpression >> AdditiveExpression is evaluated as follows:
1. Evaluate ShiftExpression.
2. Call GetValue(Result(1)).
3. Evaluate AdditiveExpression.
4. Call GetValue(Result(3)).
5. Call ToInt32(Result(2)).
6. Call ToUint32(Result(4)).
7. Mask out all but the least significant 5 bits of Result(6), that is, compute Result(6) & 0x1F.
8. Perform sign-extending right shift of Result(5) by Result(7) bits. The most significant bit is
propagated. The result is a signed 32 bit integer.
9. Return Result(8).

9.5 ToInt32: (Signed 32 Bit Integer)
The operator ToInt32 converts its argument to one of 2³² integer values in the range 2³¹ through 2³¹-1, inclusive. This operator functions as follows:
1. Call ToNumber on the input argument.
2. If Result(1) is NaN, +0, -0, +∞, or -∞, return +0.
3. Compute sign(Result(1)) * floor(abs(Result(1))).
4. Compute Result(3) modulo 2 ; that is, a finite integer value k of Number type with positive sign and less than 2³² in magnitude such the mathematical difference of Result(3) and k is mathematically an integer multiple of 2³².
5. If Result(4) is greater than or equal to 2³¹, return Result(4) - 2³², otherwise return Result(4).

# ? May 15, 2015 00:12

Bognar: Aug 4, 2011; I am the queen of France; Hot Rope Guy

Qwertycoatl posted:

code:

unsigned int is_even(unsigned int x)
{
    for (unsigned int i = 0; i < x; i++) {
        x *= x;
    }
    return !x;
}

I think this is my favorite.

# ? May 15, 2015 00:27

sarehu: Apr 20, 2007; (call/cc call/cc)

Holy poo poo, at first I thought it was broken for x < 5.

# ? May 15, 2015 00:29

xtal: Jan 9, 2011; by Fluffdaddy

xtal fucked around with this message at 00:51 on May 18, 2015

# ? May 15, 2015 00:32

Carthag Tuek: Oct 15, 2005; Tider skal komme,
tider skal henrulle,
sl�gt skal f�lge sl�gters gang

[code]
class EnterpriseOddEvenProviderBeanFactoryImpl {

# ? May 15, 2015 01:10

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# ? May 25, 2024 05:34

Pavlov: Oct 21, 2012; I've long been fascinated with how the alt-right develops elaborate and obscure dog whistles to try to communicate their meaning without having to say it out loud
Stepan Andreyevich Bandera being the most prominent example of that

Snapchat A Titty posted:

[code]
class EnterpriseOddEvenProviderBeanFactoryImpl {

AbstractSingletonProxyFactoryBean?

# ? May 15, 2015 01:18

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Coding Horrors: You can gather all your technical debt into one easy framework!

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