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- BB1000000000
-
Scratcher
34 posts
New Block: () Is Even/Odd?
The block would be a Boolean that reports if the specified number is even/odd. If so, it would return true, if not it would return false. Such a block could be placed in the Operators category. This is what the block might look like:
<(10) is [even v]? ::operators>A workaround may be to use the
() mod ()along with the
[] = [].
Last edited by BB1000000000 (Dec. 26, 2019 18:48:36)
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BB1000000000
Been Scratching since September 2018 (the near-end of Scratch 2.0), created this account in December 2019.
I play Minecraft and Among Us, and program in C++ and JavaScript.
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- WindOctahedron
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
I don't think that it needs to be added, because the workaround is very easy to make:
<((n) mod (2)) = [0]> // outputs "true" if the number is even
<((n) mod (2)) = [1]> // outputs "true" if the number is odd
Last edited by WindOctahedron (Dec. 26, 2019 18:33:11)
The message above may contain wrong information, rude remarks, or something embarrassing to my current self. In this case, please ignore it and remember that I likely wrote it back when I didn't know what “respect” truly meant. I really hate thinking about it again.
- BB1000000000
-
Scratcher
34 posts
New Block: () Is Even/Odd?
I don't think that it needs to be added, because the workaround is very easy to make:That's what I said at the end of the post: you can use the<((n) mod (2)) = [0]> // outputs "true" if the number is even
<((n) mod (2)) = [1]> // outputs "true" if the number is odd
() mod ()and the
[] = []blocks together to recreate the function of the supposed new block, but I think that the new block would be easier for New Scratchers to understand and comprehend, and to reduce the file size of more complex projects.
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BB1000000000
Been Scratching since September 2018 (the near-end of Scratch 2.0), created this account in December 2019.
I play Minecraft and Among Us, and program in C++ and JavaScript.
This is my signature, not typed text. If you want to create your own, go to the discussion homepage here and click on “Change your signature” at the near-bottom of the page.
- fdreerf
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
That's what I said at the end of the post: you can use the1.) When will an even/odd block be useful, let alone understood, by New Scratchers?() mod ()and the[] = []blocks together to recreate the function of the supposed new block, but I think that the new block would be easier for New Scratchers to understand and comprehend, and to reduce the file size of more complex projects.
2.) How will one block reduce the file size of a project when it will most likely be used once or twice?
Hyped for MS-DOS 11.0
- WindOctahedron
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
I saw it, I just wanted to show you the full workaround.-snip-That's what I said at the end of the post: you can use the() mod ()and the[] = []blocks together to recreate the function of the supposed new block.
but I think that the new block would be easier for New Scratchers to understand and comprehend, and to reduce the file size of more complex projects.I agree that it would be easier to understand; I've seen some users who said “when I joined, the only block I didn't understand was the ”mod“ block”.
However, I disagree with the fact that it would take up less space. All blocks are groups of commands/calculations, and those commands/calculations are made of simpler commands/calculations, and so on. Some commands/calculations (and blocks) require more simpler commands/calculations to be executed, so they take up more space. Following this logic, “_ is even?” would take up as much space as the workaround I posted.
The message above may contain wrong information, rude remarks, or something embarrassing to my current self. In this case, please ignore it and remember that I likely wrote it back when I didn't know what “respect” truly meant. I really hate thinking about it again.
- 45afc4td
-
Scratcher
100+ posts
New Block: () Is Even/Odd?
As mentioned, bitwise operations on a single bit like this are easily workaroundable.
So, you are suggesting this programming concept:
On an integer x, a bitwise & operation on a single bit, a power of two, is achieved like this:
In turn, int(x) is workarounded as
However, the mathematical odd/even booleans are not dependent on signed 32-bit overflow, so it can be ignored. Because the power of 2 in the and is 1, the divisions and multiplications can be skipped. As a result, the programming concept converts to
However, it casts x to an integer. However, in mathematics when a number is not an integer, it is neither odd or even. So, an extra condition is required:
And this is the final workaround.
No, you cannot always use “the shorter code”:
It returns true. However, the double -0.99999999999999985 is not an odd number, as it's not an integer.
That properly returns false. -0.99999999999999985 is a distinct double from -1 and can be detected as not an integer.
I would have used -0.9999999999999999 for that example, but for some reason Scratch 2.0 interprets that as -1.
So, you are suggesting this programming concept:
(x & 1) == 0
(x & 1) == 1
On an integer x, a bitwise & operation on a single bit, a power of two, is achieved like this:
((((int x)/(65536))mod(2))*(65536))65536 is a power of 2. This is only for powers of 2; the code for arbitrary & operation on doubles is more complicated.
In turn, int(x) is workarounded as
((((([floor v]of(x))mod(4294967296))+(2147483648))mod(4294967296))-(2147483648))
However, the mathematical odd/even booleans are not dependent on signed 32-bit overflow, so it can be ignored. Because the power of 2 in the and is 1, the divisions and multiplications can be skipped. As a result, the programming concept converts to
<(([floor v]of(x))mod(2))=(0)>
<(([floor v]of(x))mod(2))=(1)>
However, it casts x to an integer. However, in mathematics when a number is not an integer, it is neither odd or even. So, an extra condition is required:
<<(([floor v]of(x))mod(2))=(0)>and<([floor v]of(x))=(x)>>
<<(([floor v]of(x))mod(2))=(1)>and<([floor v]of(x))=(x)>>
And this is the final workaround.
No, you cannot always use “the shorter code”:
<((-0.99999999999999985) mod (2)) = [1]>
It returns true. However, the double -0.99999999999999985 is not an odd number, as it's not an integer.
<<(([floor v]of(-0.99999999999999985))mod(2))=(1)>and<([floor v]of(-0.99999999999999985))=[-0.99999999999999985]>>
That properly returns false. -0.99999999999999985 is a distinct double from -1 and can be detected as not an integer.
I would have used -0.9999999999999999 for that example, but for some reason Scratch 2.0 interprets that as -1.
- Mr_PenguinAlex
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
When wouldThat's what I said at the end of the post: you can use the1.) When will an even/odd block be useful, let alone understood, by New Scratchers?() mod ()and the[] = []blocks together to recreate the function of the supposed new block, but I think that the new block would be easier for New Scratchers to understand and comprehend, and to reduce the file size of more complex projects.
2.) How will one block reduce the file size of a project when it will most likely be used once or twice?
<((n) mod (2)) = [0]>be understood by New Scratchers though?
Last edited by Mr_PenguinAlex (Dec. 28, 2019 03:04:51)
- fdreerf
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
When wouldThat doesn't answer my question on when it'd be useful.<((n) mod (2)) = [0]>be understood by New Scratchers though?
Hyped for MS-DOS 11.0
- 45afc4td
-
Scratcher
100+ posts
New Block: () Is Even/Odd?
Is this better?When wouldThat's what I said at the end of the post: you can use the1.) When will an even/odd block be useful, let alone understood, by New Scratchers?() mod ()and the[] = []blocks together to recreate the function of the supposed new block, but I think that the new block would be easier for New Scratchers to understand and comprehend, and to reduce the file size of more complex projects.
2.) How will one block reduce the file size of a project when it will most likely be used once or twice?<((n) mod (2)) = [0]>be understood by New Scratchers though?
<<(([floor v]of(x))mod(2))=(0)>and<([floor v]of(x))=(x)>>
<<(([floor v]of(x))mod(2))=(1)>and<([floor v]of(x))=(x)>>
- Nambaseking01
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
Is this better?<<(([floor v]of(x))mod(2))=(0)>and<([floor v]of(x))=(x)>>
<<(([floor v]of(x))mod(2))=(1)>and<([floor v]of(x))=(x)>>
Is this supposed to be sarcasm? Because that workaround is more complex than the ones suggested,
—
Should I ask you why you want this block when the workaround is obvious? Fine, some blocks might actually be there even though the workaround is simple but this one is maths. We can't sit adding every single mathematical calculation into Operations just because there already exist a few.
I might as well add binary calculators, Pi radius counters, and so on… Don't you understand that maths is almost endless?
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- Sheep_maker
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
Some programming languages require the mod workaround for even vs odd, so forcing Scratchers to use this workaround would better prepare them for those languages (though in many of those languages you are able to define utility procedures to make your code easier to understand, so maybe Scratch should just add custom reporters)
However, languages like Racket have even and odd procedures
By the way, typically when dealing with even vs odd, it's implied that one is working with integers
const isEven = n => n % 2 === 0 console.log(isEven(10)) // true
By the way, typically when dealing with even vs odd, it's implied that one is working with integers
- Sheep_maker This is a kumquat-free signature. :P
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- BB1000000000
-
Scratcher
34 posts
New Block: () Is Even/Odd?
I would absolutely agree that the more complex version is even harder to comprehend by New Scratchers, and unless the number can be a floating-point (contains a decimal point) negative number, that the simpler workaround should be used instead. (The one with theIs this better?<<(([floor v]of(x))mod(2))=(0)>and<([floor v]of(x))=(x)>>
<<(([floor v]of(x))mod(2))=(1)>and<([floor v]of(x))=(x)>>
Is this supposed to be sarcasm? Because that workaround is more complex than the ones suggested,
—
Should I ask you why you want this block when the workaround is obvious? Fine, some blocks might actually be there even though the workaround is simple but this one is maths. We can't sit adding every single mathematical calculation into Operations just because there already exist a few.
I might as well add binary calculators, Pi radius counters, and so on… Don't you understand that maths is almost endless?
(() mod ())and the
<[] = []>blocks combined together).
Feeling like giving an internet? Give them here! (I would have used the actual badge, but internetometer.com isn't a whitelisted image host.)
BB1000000000
Been Scratching since September 2018 (the near-end of Scratch 2.0), created this account in December 2019.
I play Minecraft and Among Us, and program in C++ and JavaScript.
This is my signature, not typed text. If you want to create your own, go to the discussion homepage here and click on “Change your signature” at the near-bottom of the page.
- fdreerf
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
Is this supposed to be sarcasm? Because that workaround is more complex than the ones suggested,You learn something new everyday.
Anyway, this topic should be closed by now, there's a simple workaround to block suggested.
Hyped for MS-DOS 11.0
- Starstriker3000
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
Just because there's a workaround doesn't mean it should be closed just for that reason. In fact,Is this supposed to be sarcasm? Because that workaround is more complex than the ones suggested,You learn something new everyday.
Anyway, this topic should be closed by now, there's a simple workaround to block suggested.
Literally everything is workaroundable, the ATs figured out the minimum amount of blocks needed to use Scratch at one point, all else is “workaroundable”.
- BB1000000000
-
Scratcher
34 posts
New Block: () Is Even/Odd?
fdreerf wants the topic closed, while Starstriker3000 thinks the topic should stay open. I am going to leave the topic open, in case anyone else wants to add to the information in the forum topic/thread.Just because there's a workaround doesn't mean it should be closed just for that reason.Is this supposed to be sarcasm? Because that workaround is more complex than the ones suggested,You learn something new everyday.
Anyway, this topic should be closed by now, there's a simple workaround to block suggested.
Feeling like giving an internet? Give them here! (I would have used the actual badge, but internetometer.com isn't a whitelisted image host.)
BB1000000000
Been Scratching since September 2018 (the near-end of Scratch 2.0), created this account in December 2019.
I play Minecraft and Among Us, and program in C++ and JavaScript.
This is my signature, not typed text. If you want to create your own, go to the discussion homepage here and click on “Change your signature” at the near-bottom of the page.
- Mr_PenguinAlex
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
Support, would be useful for cool games and s t u f f
- mica43683
-
Scratcher
500+ posts
New Block: () Is Even/Odd?
I don't think you'd need the dropdown. Just use
<() is even?::operators>and
<not <() is even?::operators>>
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- Za-Chary
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
I don't think you'd need the dropdown. Just useBut “not even” is not the same as “odd”. For example, 1.5 is neither even nor odd.<() is even?::operators>and<not <() is even?::operators>>
I suppose this could be fixed if the block returned something like NaN for non-integer values.
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- BB1000000000
-
Scratcher
34 posts
New Block: () Is Even/Odd?
I suppose this could be fixed if the block returned something like NaN for non-integer values.I don't think that it would be possible, because to my knowledge Boolean blocks only return true or false, not numbers or strings (text). If it was a reporter, it could return a string, number or other non-binary values.
Feeling like giving an internet? Give them here! (I would have used the actual badge, but internetometer.com isn't a whitelisted image host.)
BB1000000000
Been Scratching since September 2018 (the near-end of Scratch 2.0), created this account in December 2019.
I play Minecraft and Among Us, and program in C++ and JavaScript.
This is my signature, not typed text. If you want to create your own, go to the discussion homepage here and click on “Change your signature” at the near-bottom of the page.
- Sheep_maker
-
Scratcher
1000+ posts
New Block: () Is Even/Odd?
It should just return false for non-integers
However I think also adding an odd? block would help with readability
Boolean blocks are supposed to return true or false by design, but technically they can return anything. Apparently Scratch considers NaN as falsy:I suppose this could be fixed if the block returned something like NaN for non-integer values.I don't think that it would be possible, because to my knowledge Boolean blocks only return true or false, not numbers or strings (text). If it was a reporter, it could return a string, number or other non-binary values.
<not <((0) / (0))::#8BC34A>> // true< _ > block is from my extension
If someone is dealing with even vs odd, they're probably already limiting their domain to integersI don't think you'd need the dropdown. Just useBut “not even” is not the same as “odd”. For example, 1.5 is neither even nor odd.<() is even?::operators>and<not <() is even?::operators>>
I suppose this could be fixed if the block returned something like NaN for non-integer values.
However I think also adding an odd? block would help with readability
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