Recent questions tagged language

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language design - Why is this legal in C?

I am writing a toy C compiler for a compiler/language course at my university. I'm trying to flesh out the ... with a respective type. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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language agnostic - Are digits represented in sequence in all text encodings?

This question is language agnostic but is inspired by these c/c++ questions. How to convert a single char into an ... so worried about . . . See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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707 views

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language features - Why is there no string interpolation in Scala?

This is not just an idle quip... I wonder if anybody knows if there's an actual design reason why Scala does not ... str2 = "Hello, ${str1}"; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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language agnostic - What is a Flexible Array?

What is a Flexible Array, exactly? I can't find much on it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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language agnostic - What should the accessablity of Fields in a Abstract Class be?

To put it simply as an example, public abstract class AbstractFellow { protected Thing buddy; .... public class ... } Is this bad practice? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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670 views

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language agnostic - Is there a formal name for a function that accepts a function(s) as an argument?

Is there a formal name for a type of function that accepts a function(s) as an argument? I've tried ... Perhaps there is no formal name? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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805 views

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language agnostic - Is the use of machine epsilon appropriate for floating-point equality tests?

This is a follow-up to Testing for floating-point value equality: Is there a standard name for the precision ... 14 (if not 15) digits? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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719 views

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language lawyer - Declaration vs definition in C

Consider the code: int main(void) { int a; } As far as I know, int a; is a definition, as it causes ... you later use the identifier or not? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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878 views

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language agnostic - How many 1s in an n-bit integer?

An interesting problem I ran into today: what is the fastest way to count the number of 1s in an n-bit ... by implementing such a strategy.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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782 views

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language lawyer - Are JavaScript template literals guaranteed to call toString()?

const num = 42 const str = `My number is ${num}` In this code what guarantee do I have about the ... conversion be done in another way ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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810 views

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language design - What are the advantages and disadvantages of separating declaration and definition as in C++?

In C++, declaration and definition of functions, variables and constants can be separated like so: function ... disadvantages of this approach? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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702 views

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language agnostic - Is Switch (Case) always wrong?

Are there instances where switch(case) is is a good design choice (except for simplicity) over strategy or similar patterns... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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760 views

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language agnostic - What's the term for "double recursion"?

Here's an obviously recursive function: function() { function(); } We would simply call this "recursive"-but ... the single-function case above? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

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language lawyer - How much existing C++ code would break if void was actually defined as `struct void {};`

void is a bizarre wart in the C++ type system. It's an incomplete type that cannot be completed, and it has all ... to current (C++17) rules? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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623 views

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language lawyer - C standard regarding sizeof overflowing size_t

Is this undefined behavior? The relevant parts of the standard don't say much. size_t n = SIZE_MAX / sizeof(double) ... m = sizeof(double[n]); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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690 views

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language agnostic - How many classes should a programmer put in one file?

In your object-oriented language, what guidelines do you follow for grouping classes into a single file? Do you ... everything on one place? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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892 views

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language agnostic - Extract zlib compressed data from binary file in python

My company uses a legacy file format for Electromiography data, which is no longer in production. However, there is ... , with one data series. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

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language agnostic - Apply PCA on very large sparse matrix

I am doing a text classification task with R, and I obtain a document-term matrix with size 22490 by 120,000 ( ... 24GB RAM and 8 cpu cores. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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626 views

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language agnostic - What's a good way to structure variable nested loops?

Suppose you're working in a language with variable length arrays (e.g. with A[i] for all i in 1..A.length ... answer I went with, posted below. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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615 views

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language agnostic - Tinyurl-style unique code: potential algorithm to prevent collisions

I have a system that requires a unique 6-digit code to represent an object, and I'm trying to think of a ... dumb to know if that's possible. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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586 views

1 answer

language lawyer - What exact rules in the C++ memory model prevent reordering before acquire operations?

I have a question regarding the order of operations in the following code: std::atomic<int> x; std::atomic<int ... which C++ rules prevent this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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670 views

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language agnostic - Seating plan software recommendations (does such a beast even exist?)

I'm getting married soon and am busy with the seating plan, and am running into the usual issues of who sits ... ) to tweak for my purposes? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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678 views

1 answer

language agnostic - What are some algorithms for finding a closed form function given an integer sequence?

I'm looking form a programatic way to take an integer sequence and spit out a closed form function. Something ... ; the language is unimportant. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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512 views

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language lawyer - Is pointer tagging in C undefined according to the standard?

Some dynamically-typed languages use pointer tagging as a quick way to identify or narrow down the runtime type of the ... 's beside the point.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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628 views

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language agnostic - Is TimeSpan unnecessary?

EDIT 2009-Nov-04 OK, so it's been a little while since I first posted this question. It seems to me that many ... bases. Am I making any sense? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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523 views

1 answer

language design - Why must Python list addition be homogenous?

Can anyone familiar with Python's internals (CPython, or other implementations) explain why list addition is ... result is well-defined. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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587 views

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language agnostic - Can you explain this thing about encapsulation?

In response to What is your longest-held programming assumption that turned out to be incorrect? question, one of ... that with an example? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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566 views

1 answer

language lawyer - Is the following C union access pattern undefined behavior?

The following is not undefined behavior in modern C: union foo { int i; float f; }; union foo bar; ... is the entire read undefined behavior? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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