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Programming |OT| C is better than C++! No, C++ is better than C
- Thread starter Kikarian
- Start date
HarryHengst
Member
F# is really good though. Its pretty much a usable Haskell.
I'd say it's hellish for a dozen hours, then it clicks and everything seems smooth (well, assuming it's as close as OCaml as I think it is, I can't install Xamarin T_T )
Switch jobs with me
Nearly instant if you're in the same family
Lisp - Scheme - Clojure
Haskell - OCaml - F# - Rust - Swift
https://alf.nu/ReturnTrue
goddamn. how do you guys do it. I got 2 right
edit: got 3, damnnnn
edit: 4
goddamn. how do you guys do it. I got 2 right
edit: got 3, damnnnn
edit: 4
i'm dabbling into 3d (voxels actually) and i don't understand indices (of vertices). I googled but everything i found is too technical/advanced for my level of incompetence:
i have a square face that is made of two triangular meshes; so a total of 6 vertices for the face. But two couples of these vertices share the same coordinates, since the two triangles are joined.. Do these vertices with the equal coordinates, have the same index (meaning that, in practice, there are 4 indices -or "index values"- per face)?
i have a square face that is made of two triangular meshes; so a total of 6 vertices for the face. But two couples of these vertices share the same coordinates, since the two triangles are joined.. Do these vertices with the equal coordinates, have the same index (meaning that, in practice, there are 4 indices -or "index values"- per face)?
That's fun... Got Id, Reflexive, Counter and Peano right currently.
The fact that I barely know Javascript doesn't help, though (I wasn't even aware that Javascript had closure before today ^_^). I'll come back again later with more time, that's a good training.
We'll need more information, I think, but I suppose there could be.
For example, take the square in 3D :
Code:
(0,1,0) _____ (1,1,0)
|\ |
| \ |
| \ |
| \ |
|____\|
(0,0,0) (1,0,0)You have two triangles (0,0,0) - (0,1,0) - (1,0,0) and (0,1,0) - (1,1,0) - (1,0,0)
If you create a vertex table like
(0,0,0) | (0,1,0) | (1,0,0) | (1,1,0)
The first triangle is 0-1-2, the second 1-3-2, so 4 different indices.
You can usually represent a quad by 4 indices, like 0-1-3-2, since it's easy to reconstruct two triangles by suppressing the first and the third indices for example.
Also, where are the voxels? Or haven't I understood anything you're talking about??
It's more likely that I don't know what I'm talking about!
Anyway I think you answered my question:
here it computes the indices of the faces, 6 in total, but they get only 4 values because two are reused
Code:
int numOfIndices = CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z * 6 * 6 / 3;
short[] indices = new short[numOfIndices];
short j = 0;
for (i = 0; i < numOfIndices; i += 6, j += 4) {
indices[i + 0] = (short)(j + 0);
indices[i + 1] = (short)(j + 1);
indices[i + 2] = (short)(j + 2);
indices[i + 3] = (short)(j + 2); // notice this index value is reused
indices[i + 4] = (short)(j + 3);
indices[i + 5] = (short)(j + 0); // notices this index values is reused
}here it creates the Meshes. i guess the last like sets up the "vertex tables" that you mention, with a total of 4 indices per face.
Code:
this.meshes = new Mesh[chunksX * chunksY * chunksZ];
for (i = 0; i < meshes.length; i++) {
meshes[i] = new Mesh(
true,
CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z * 6 * 4,
CHUNK_SIZE_X * CHUNK_SIZE_Y * CHUNK_SIZE_Z * 36 / 3,
VertexAttribute.Position(),
VertexAttribute.Normal()
);
meshes[i].setIndices(indices);
}(this code is Java using libGDX, from here: https://github.com/libgdx/libgdx/tree/master/tests/gdx-tests/src/com/badlogic/gdx/tests/g3d/voxel)
Yes, that's it...
It seems a part to convert the voxels into triangles for displaying purpose?
https://alf.nu/ReturnTrue
goddamn. how do you guys do it. I got 2 right
edit: got 3, damnnnn
edit: 4
I've got the first 7 so far. This is fun.
OminoMichelin
Member
Am I missing something? I cannot even complete the second one...
voxels are just 3d bitmaps, they aren't very complicated at all. A bitmap is just an array storing some data(color if we are talking about images) and some information about its dimensions, so in 2d you have width and height and in 3d you have depth as well. Unlike triangles though since voxels is a data structure there's no notion of what they look like in terms of graphics. Most applications render them as cubes(but you could use whatever you want) and to do that you need to generate the geometry which I guess is what you are looking at.
The second one exists in many (most?) languages since it's part of IEEE.
The third one, on the other hand, I'm not sure...
Moral Panic
Member
More of a test if your knowledge of Javascript edge cases/rules.
NaN never is equal to anything
OminoMichelin
Member
Aaah I see, I never really used js.
This rule is pretty much universal, since it's in IEEE
754
Is the transitivity exception one a javascript oddity?
Yes. Note the lack of strict equality.
runningjoke
Member
Got counter down to 27 no spoilers
No idea about the others. Anyway I think the test is bullshit because you should avoid all those situations.
()=>{var a=0;return()=>++a}
No idea about the others. Anyway I think the test is bullshit because you should avoid all those situations.
Saw it immediately, but I still don't have a clue. Again, I'm a JS newbie, I don't know all null / 0 / "" / undefined / etc. comparison results, and I suspect that's one of those cases...
Did 14, although I wasn't aware that
_ could replace ()
Can't really see how you can do less, but I have a lot to learn in JS. But the 1-character solution makes me wondering.
Was my first try, then I tried to reduce the variable declaration... Especially when getting rid of it means getting rid of return, too.
Little spoiler
think default arguments
Yeah I could shave one off too with that but I have no idea why it works or where I can read up on it despite having gone over ES2015 multiple times.
This is my comprehensible solution for counter.
(x=1)=>()=>x++%4
How did you shave a point off of that? I think I can shorten the first argument but it's unclear how.
() is needed if you have no arguments or it won't parse correctly, if you add a single character argument (in this case "_") it's actually one character shorter because parens can be omitted.
Any of the 1 character solutions are cheating. You can trivially hack the code on the page so if it seems too low it is.
cpp_is_king
Member
You can delete 2 characters from this solution and it still works.
You can also replace 2 characters with 1 character and it still works.
That brings it down to 13.
Hint : a is not b.
I LOVE code golf. If there's any interesting ressources for Python, I'm interested.
This one is more generic, supporting multiple languages for the same questions: https://www.codewars.com
I know this one... Codingame, too. And a bunch of problems collections like Euler Project to Advent of Code. (We should actually do a list)
But I was specifically talking about code golf, where length of solution matter. Codingame did this at a time, but I think they removed it...
cpp_is_king
Member
I think I discovered it here, in fact
Edit: visited back Codewars for some fun... man, the rating system of solutions is still awfully broken... Seeing top-ranked solutions in both "Clever" and "Best practices" being O(n²) or O(n³) when the solution is obviously linear is... well...
Quick question.
I defined two methods in Java, methodA(List<T> listA, List<T> listB) and methodB(T item, List<T> list). I then try to call the first method by passing two List<Integer>. However, when I try to compile, it complains about ambiguity.
What can I do to solve that?
I defined two methods in Java, methodA(List<T> listA, List<T> listB) and methodB(T item, List<T> list). I then try to call the first method by passing two List<Integer>. However, when I try to compile, it complains about ambiguity.
What can I do to solve that?
That's proper ECMS? I used pow :/
Because
2e53-1 is 2 * 10^53 and not 2^53
I'm also curious...
I don't know JS but I was able to get the questions because of this joke video
https://www.destroyallsoftware.com/talks/wat
https://www.destroyallsoftware.com/talks/wat
Experimental ES6 feature!
proto1 is the first question I answered almost instantly, but 19 isn't very good. I'm wondering where the 16 score people are saving chars.
Lmao that last one.
I don't even know what I'm looking at ^_^
(finally found the transitive one, though... damn those comparisons are strange)
let's see the code
There's not much more to that.
Code:
import java.util.*;
public class HelloWorld{
public static <T> List<T> methodA(List<T> list1, List<T> list2){
List<T> result = new ArrayList<T>();
System.out.println("A");
return result;
}
public static <T> List<T> methodA(T element, List<T> list){
List<T> result = new ArrayList<T>();
System.out.println("B");
return result;
}
public static void main(String []args){
List<Integer> a = methodA(Arrays.asList(1, 2), Arrays.asList(1, 2, 3));
}
}cpp_is_king
Member
That code works fine for me.
What I find odd is that you're not even invoking methodB at all. So it seems completely irrelevant to your question.
Ops sorry, checked here again, both method are called methodA. My bad. Will update the code.
The compiler error this:
Code:
HelloWorld.java:18: error: reference to methodA is ambiguous
List<Integer> a = methodA(Arrays.asList(1, 2), Arrays.asList(1, 2, 3));
^
both method <T#1>methodA(List<T#1>,List<T#1>) in HelloWorld and method <T#2>methodA(T#2,List<T#2>) in HelloWorld match
where T#1,T#2 are type-variables:
T#1 extends Object declared in method <T#1>methodA(List<T#1>,List<T#1>)
T#2 extends Object declared in method <T#2>methodA(T#2,List<T#2>)
1 errorWorks for me.
Only way I can think to get rid of the ambiguity is to add a third parameter to each call of Class<T> clazz.
Then add Integer.class in the call from main.
Like:
Code:
public static void main(String[] args) {
List<Integer> a = methodA(Arrays.asList(1, 2, 3), Arrays.asList(1, 2, 3), Integer.class);
}
public static <T> List<T> methodA(List<T> list1, List<T> list2, Class<T> clazz) {
List<T> result = new ArrayList<T>();
System.out.println("A");
return result;
}
public static <T> List<T> methodA(T element, List<T> list, Class<T> clazz) {
List<T> result = new ArrayList<T>();
System.out.println("B");
return result;
}You're just running into a type erasure problem.
cpp_is_king
Member
Just specify it explicitly?
Code:
List<Integer> a = methodA<Integer>(Arrays.asList(1, 2, 3), Arrays.asList(1, 2, 3));No. I don't believe that will work in this case.
<EDIT>
Actualy it might since the methods are static and he does it like this
Code:
List<Integer> a = HelloWorld.<Integer>methodA(Arrays.asList(1, 2, 3), Arrays.asList(1, 2, 3));but I'm not in front of a compiler right now to test it.
TheeDanielJ
Neo Member
Hello everyone, I'm new here and am new to programming. I could really use some help. I'm working on validating string input. My loops repeats when its time for validating integer input, but just skips when its time to validate string input.
cout << "Player 1 enter your car number!" << endl;
cin >> carNumber[0];
while (cin.fail())
{
cout << "ERROR! Your car number must be an integer!" << endl;
cout << "Enter a number!" <<endl;
cin.clear();
cin.ignore(std::numeric_limits<int>::max(), '\n');
cin >> carNumber[0];
}
cout << "Player 1 enter a color for your car!" << endl;
cin >> carColor[0];
while (cin.fail())
{
cout << "ERROR! You must input a string aka a word!" << endl;
cout << "Enter a color!" << endl;
cin.clear();
cin.ignore((std::numeric_limits<std::streamsize>::max)(), '\n');
cin >> carColor[0];
}
Any help would be appreciated!
cout << "Player 1 enter your car number!" << endl;
cin >> carNumber[0];
while (cin.fail())
{
cout << "ERROR! Your car number must be an integer!" << endl;
cout << "Enter a number!" <<endl;
cin.clear();
cin.ignore(std::numeric_limits<int>::max(), '\n');
cin >> carNumber[0];
}
cout << "Player 1 enter a color for your car!" << endl;
cin >> carColor[0];
while (cin.fail())
{
cout << "ERROR! You must input a string aka a word!" << endl;
cout << "Enter a color!" << endl;
cin.clear();
cin.ignore((std::numeric_limits<std::streamsize>::max)(), '\n');
cin >> carColor[0];
}
Any help would be appreciated!
Im slowly getting the grip on VBA, but I ran into an issue where if I convert the contents of a cell to a string, modify it and write it back, it omits the last nr if its a 0.
My code is here
Ideally that should take a value like "2016.06" and convert it into "T2016.06"
But with October "2016.10" it gives me "T2016.,1"
Worst case I can go and change that one cell every time I convert but Id like to find a solution for this.
My code is here
Code:
s = "T" + Left(CStr(ws.Cells(1, i)), 4) + "." + Right(CStr(ws.Cells(1, i)), 2)
ws.Cells(1, i).Value = sIdeally that should take a value like "2016.06" and convert it into "T2016.06"
But with October "2016.10" it gives me "T2016.,1"
Worst case I can go and change that one cell every time I convert but Id like to find a solution for this.