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Type: Posts; User: wolle

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1. ## Thread: How to generate a condition (true or false) based on possibilities?

by wolle
Replies
6
Views
175

### Re: How to generate a condition (true or false) based on possibilities?

In this case, you have a total of 52 balls in the urn. The chance of picking a blue is 50/52, and a red is 2/52. The total probability is 50/52 + 2/52 = 52/52 = 1 (the ball will always be either blue...
2. ## Thread: How to generate a condition (true or false) based on possibilities?

by wolle
Replies
6
Views
175

### Re: How to generate a condition (true or false) based on possibilities?

The link in my previous reply suddenly doesn't seem to work so I supply an example. It is based on the recipe: "Generating pseudo-random numbers" in Modern C++ Programming Cookbook, 2nd ed. by Marius...
3. ## Thread: How to generate a condition (true or false) based on possibilities?

by wolle
Replies
6
Views
175

### Re: How to generate a condition (true or false) based on possibilities?

If you have the possibilities 0.8, 0.1, and 0.1 you think of them as three intervals,

1: 0.0 <= x < 0.8
2: 0.8 <= x < 0.9
3: 0.9 <= x < 1.0

Then you draw a random float x between 0 and 1, for...
4. ## Thread: Need to convert an INT to WORD*

by wolle
Replies
6
Views
210

### Re: Need to convert an INT to WORD*

Well, according to the link in my previous post, according to the C++ standard, a reinterpret_cast should work,

"3) A value of any integral or enumeration type can be converted to a pointer type."...
5. ## Thread: Need to convert an INT to WORD*

by wolle
Replies
6
Views
210

### Re: Need to convert an INT to WORD*

As a last resort, there's always the reinterpret_cast,

https://en.cppreference.com/w/cpp/language/reinterpret_cast
6. ## Thread: challenged problem C++ implementation - homework help (preparing for an interview).

by wolle
Replies
7
Views
273

### Re: challenged problem C++ implementation - homework help (preparing for an interview

This problem is quite common and there are several ways to solve it,

https://web.stanford.edu/class/cs9/sample_probs/TwoSum.pdf

The video uses the hashtable approach. A hashtable is a data...
7. ## Thread: string replace related

by wolle
Replies
6
Views
331

### Re: string replace related

And you are not the only one :). I recognize the problem because I replied to this thread,

8. ## Thread: coming up with data structure for the algorithm

by wolle
Replies
9
Views
1,029

### Re: coming up with data structure for the algorithm

You don't have to sort anything. Of course you can store all distances and then sort them to find the shortest. But you really just need to keep track of one distance, the shortest_so_far. Each time...
9. ## Thread: coming up with data structure for the algorithm

by wolle
Replies
9
Views
1,029

### Re: coming up with data structure for the algorithm

Do you want to find the shortest cell distance between two sites? Then you just calculate all possible cell distances one by one and keep the shortest so far. You don't need a data structure for that.
10. ## Thread: JAVA errors

by wolle
Replies
3
Views
620

### Re: JAVA errors

Start with a minimal program that works. In this case just a main method that prints "Hello world". Then add code, little by little in incremental steps making sure it works after each step. So you...
11. ## Thread: I want to learn how monitors and graphics hardware create and display images.

by wolle
Replies
3
Views
1,718

### Re: I want to learn how monitors and graphics hardware create and display images.

Why not just take a screenshot,

https://www.howtogeek.com/226280/how-to-take-screenshots-in-windows-10/
12. ## Thread: I want to learn how monitors and graphics hardware create and display images.

by wolle
Replies
3
Views
1,718

### Re: I want to learn how monitors and graphics hardware create and display images.

Here's a site trying to explain how things work to a general audience,

https://computer.howstuffworks.com/graphics-card.htm
13. ## Thread: What does an interface not allowed to have any implementation?

by wolle
Replies
6
Views
1,267

### Re: What does an interface not allowed to have any implementation?

There are two kinds of inheritance, inheritance of implementation and inheritance of interface. Inheritance of implementation can lead to the so called fragile base class problem,
...
14. ## Thread: Best web dev language 2020

by wolle
Replies
5
Views
722

### Re: Best web dev language 2020

It looks like your buddy has been right all the time, only it took a little while for the future to arrive :). Maybe Java got in between. It showed up in 1995 and enjoyed an almost religious...
15. ## Thread: Best web dev language 2020

by wolle
Replies
5
Views
722

### Re: Best web dev language 2020

To me it seems Python is the new Basic. At least it is very popular (Tiobe Nov. 2020),

https://www.tiobe.com/tiobe-index/

But considering your VB6 background maybe VB (.NET) is a better choice,...
16. ## Thread: replace with sort algorithm

by wolle
Replies
21
Views
2,137

### Re: replace with sort algorithm

Well, what I can see from the code in #1 you are copying already as part of the sorting process (swapping of records),

{
PiInfo tmp = pIIInfo[(size_t)i];
pIIInfo[(size_t)i] =...
17. ## Thread: replace with sort algorithm

by wolle
Replies
21
Views
2,137

### Re: replace with sort algorithm

If the problem is that you want to co-sort the second array with the first, one way is to introduce a temporary std::vector of std:: pair.

In each std:: pair you combine a PiInfo object with its...
18. ## Thread: Programm crashes due to the presence of code even if it is not executed

by wolle
Replies
6
Views
794

### Re: Programm crashes due to the presence of code even if it is not executed

Just because a section of code cannot be reached due to the program logic doesn't mean it's not present in the executable. It may still influence what else gets included that can cause problems.

I...
19. ## Thread: c/c++ ide for win/linux GUI programming

by wolle
Replies
3
Views
908

### Re: c/c++ ide for win/linux GUI programming

Yet another cross-platform GUI is wxWidgets,

https://www.wxwidgets.org/
20. ## Thread: boost::bind

by wolle
Replies
9
Views
1,068

### Re: boost::bind

Maybe it is a question of programming style. Traditionally in procedural programming, if you don't have all parameters immediately available to call a function you gather them by asking around for...
21. ## Thread: boost::bind

by wolle
Replies
9
Views
1,068

### Re: boost::bind

I've never got into using bind because you regularly see articles like this,

https://abseil.io/tips/108

This article suggest using either lambdas or absl::bind_front instead, the latter...
22. ## Thread: Rust Language Rocket Framework

by wolle
Replies
2
Views
2,296

### Re: Rust Language Rocket Framework

The complete text can be found here,

https://en.wikipedia.org/wiki/Rust_(programming_language)
23. ## Thread: Force a friend outside of class declaration?

by wolle
Replies
3
Views
621

### Re: Force a friend outside of class declaration?

Well, I'm sure there is some ugly trick to do it but using the preprocessor is better I think because then you don't break the C++ language itself. The preprocessor allows you to select which parts...
24. ## Thread: Force a friend outside of class declaration?

by wolle
Replies
3
Views
621

### Re: Force a friend outside of class declaration?

You could use the preprocessor to define a macro that looks like this while testing,

#define UNITTEST_FRIEND int AccessPrivateSruff(const MyClass& obj);

and otherwise like this,

#define...
25. ## Thread: Looking for SSE instruction

by wolle
Replies
5
Views
524

### Re: Looking for SSE instruction

You could replace the loop with 16 straight assignments like,

target[0] = A[0];
target[1] = B[0];
target[2] = C[0];
target[3] = D[0];
target[4] = A[1];
target[5] = B[1];
...
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