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General C++ Programming - August 2022 (Page 3)

Error: cannot convert ‘const Scalar*’ {aka ‘const double*’} to ‘const std::complex<double>*’

I am trying to solve for a linear system of equations x = A\b and I am using the following expression in Eigen: x = A.colPivHouseholderQr().solve(b); ...

[3 replies] Last: Thanks for the help. I was wondering what is the difference b/w rei... (by JamieAl)

by nvthielen

Addmenus

Hello, Cplusplus. I have a problem when I Append the Menu Item a get an error the argument of type const char" is incompatible with parameter of type "...

[4 replies] Last: sold the puzel, void AddMenus(HWND hwnd) { HMENU hMenu = Crea... (by nvthielen)

by LukeProducts

Write object into file

Hello guys, i am working on a simple password manager and i want to write multiple struct Credential objects into a bin file. #include <stdio.h> #include <s...

[6 replies] Last: Thanks, thats good to know ive already thought that too. I dont suppos... (by LukeProducts)

by ruzip

Detect Num Lock key press/up and other special keys in GLUT/FREEGLUT

I can't seem to find any documentation on how to detect other special keys like Num Lock, Scroll Lock, Pause, PrintScreen when they are hit/key up in Glut/FreeG...

[7 replies] Last: Thanks guys for the additional info. The workaround you mentioned ne... (by ruzip)

by Bubbles0012

Shift words

Hi if I have a 2d array , how can I shift either left or right, for example: xhellofreind xxxhellofriend

[4 replies] Last: 2d is still a solid block. so its fine. 2d dynamic, need to loop it ... (by jonnin)

by alexdieter

Assignment with arrays

Hello, I need help with this assignment and I have zero ideas what to do and how to even start. Could anyone help at all. (1) Function Algorithms for Array El...

[2 replies] Last: your own programming interface and algorithm Maybe :) : #include... (by seeplus)

by alexdieter

How to assign 2D array with random numbers

How do I assign 2D array with random numbers. I need to display this C1 C2 C3 C4 C5 R1 2 3 4 1 6 R2 3 3 4 4 5 R3 4 ...

[2 replies] Last: #include <iostream> #include <random> #include <utility> #include <a... (by seeplus)

by LukeProducts

Overflow while converting domain name to ip address

Hello all, ive just written a function to tell the ipv4 of any domain like f.ex "google.com", and for linux, it yust works fine. But now i shwitched to windows...

[3 replies] Last: As this topic is marked with a green tick, it looks like the OP has so... (by seeplus)

by Worldtreeboy

some function call does not require parentheses?

//Fig. 13.9: Fig13_09.cpp //Creating and testing user-defined, nonparameterized //stream manipulator #include <iostream> using namespace std; //bell manipu...

[6 replies] Last: if you want to circle back to the big question, there are several othe... (by jonnin)

by frek

Fish task

I have doubt if my understanding about the task is right or not since I don't get the score I want. The task says: You are given two non-empty arrays A and B...

[5 replies] Last: the code that I'm not going to give you Thank you for that. Only unde... (by frek)

by Andre G

C++ Reference to read offline?

Good evening everybody! I was wondering if there was any C++ reference that can be downloaded to read it offline? The reason why I am asking this is becau...

[5 replies] Last: Thanks! Like I said, I am new to this, so I did not know to look unde... (by Andre G)

by JUANDENT

why some callables require std::forward and others don't?

Hi, I am grabbing this code from cppreference.com and cannot understand why std::forward is used sometimes on the callable and sometimes it isn't... For...

[5 replies] Last: Essentially, although the "function" being called (the Callable ) is ... (by mbozzi)

by KaiTang

Strncmp consumes a lot

hello everyone, I encountered a problem. When I was performing string matching, I used the strncmp function. I found through the flashgraphs that it consumed a ...

[6 replies] Last: comparison of strings is one of the most expensive things we do regula... (by jonnin)

by frek

Objects initialized by default

As far as I know, static or const objects are initialized by default. Is it true? And is there any other type of object which is by default initialized? PS...

[12 replies] Last: Could you write what you've gathered, for example, on a conclusion li... (by TheIdeasMan)

by PeteDD

multiple definitions of class instances

(I can't delete this post...) but you can ignore it if you like since, as you can see from the next post, I fixed it. I have tried for several hours to figur...

[6 replies] Last: Brilliant Ganado! That solved a lot for me! Thanks! (by PeteDD)

by Worldtreeboy

Difference between virtual, redefining and overridden function?

These 3 seems the same because the derived class will have a same function that is overriden?

[1 reply] : https://en.cppreference.com/w/cpp/language/virtual [quote=cppreferenc... (by TheIdeasMan)

August 2022 Pages: 1 23

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