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General C++ Programming - May 2019 (Page 2)

I have data files that I use to stream data into vectors for analysis. When using Windows(NTFS), it takes like 10x as long to stream the file than Linux. I'm wo...

[16 replies] Last: Maybe so, but the elephant in the room is the god-awful slowness of pa... (by salem c)

by FilipeGomes12

Making a matrice with a headline.

Hey! I've been struggling to get this done, I can make a normal matrice work, but I can't figure out how to make it so the first line is a headline, that I wo...

[8 replies] Last: I've tried changing the row and column sizes from constants to variab... (by deleted account xyzzy)

by frek

Use of import instead of #include

Hello all, Is it now possible to use import instead of #include in C++ programs? If yes, how to use import in this sample code? #include <iostream> ...

[14 replies] Last: In theory, better compile times. (by helios)

by Dean Roddey

A project you might find useful

I recently open sourced a very large project of mine, called CIDLib, on GitHub. I just wanted to make it known to this community. I've posted a bit about it els...

[11 replies] Last: No worries. Good thing I gave your last reply a third read before I hi... (by helios)

by KingOcean34

Anyone can help me to change it to pseudocode??

#include <iostream> #include <cmath> using namespace std; int main() { double x; int n; cout << "x: "; cin >> x; cout << "n: "; cin >> n; ...

[10 replies] Last: line 12 in that code how to change to pseucode or even flowchart will... (by MikeStgt)

by Dee5

finding largest prime number in a file (1,2)

hello guys,Anyone having an idea of creating a programm that is able to find largest prime number in a file containing 100,000 numbers. Also,to print out the ...

[31 replies] Last: I know. But I don't have any good way to know whether a given piece o... (by jonnin)

by KingOcean34

Urgent Help me!!!!

#include <iostream> using namespace std; int main (int argc, char *argv ) { int x,n; cout<<"Please enter values for x : "; cin>>x; cout<<"Please enter values...

[13 replies] Last: #include <iostream> #include <cmath> using namespace std; int main()... (by lastchance)

by kindgnice

How To Solve throw std::bad_alloc{};?

Hello Professionals, Good day. I would like to ask if there's any way I can get rid of throw std::bad_alloc{};? #else // ^^^ Managed ^^^ // vvv Native vvv...

[10 replies] Last: I also tried to print the max.size of my std vectors, and this is wha... (by coder777)

by jpao

Read/Write .MP4 Files WITHOUT Library

Hi everyone, I need to make a personal library that can read, manipulate, and write .MP4 files. And I need to do it without libraries. How do you read/wri...

[15 replies] Last: Thanks for taking the time to put forward all your suggestions guys! (by jpao)

by aceadams

Competitive Programming Problem

The problem and my attempted code solution is as follows: Farming is competitive business -- particularly milk production. Farmer John figures that if he doesn'...

[6 replies] Last: Thanks soo much! (by aceadams)

by s l i m

Problem!!! Help!!

Hi guys! I have a problem that i hope you give me an advice to solve it. I have writing this code and it doesn't run cuz its a problem. C2562 'Draw':'void' fu...

[4 replies] Last: Show a complete example that reproduces your issue, else you're just w... (by Ganado)

by iSWATxJOKERi

Trying to finish my unscrambling project

Hi, I am doing the project ideas that I found on the forum for people wanting to get better at C++ ( http://www.cplusplus.com/forum/beginner/3473/) and I am stu...

[8 replies] Last: :D Hahaha yeah I just learned it today *facepalm*. I went on to the n... (by Niccolo)

by kitfox

Does C++ have anything like Java's inner classes?

I sometimes come across a situation where I want to create a class manages a list of records. The records themselves will never be used outside of the class, b...

[5 replies] Last: for what its worth, in my experience, as soon as you block something f... (by jonnin)

by Manga

tons of errors

vs2019 gives me lots of errors. Here is my code... #include <iostream> #include <vector> using namespace std; class funV { std::vector<int> v; public: /...

[8 replies] Last: Thanks Ganado... adding std:: solved my problem. And yes I will add a... (by Manga)

by larry burns

How to pass pointer by reference in C?

I have the following code in C (not C++): int main(){ double *ptr=0; double x ={1,2,3}; double y ={4,5}; ptr=&x; for (int i=0; ...

[10 replies] Last: you are correct, C does not have references. The two languages are f... (by jonnin)

by idknuttin

I created a class that acts just like a set but uses OpenMP to run in parallel to make everything faster, your thoughts? (1,2)

I created a class that does just about everything a set does in C++, such as insertion, deletion, and searching but I used OpenMP to make it run in parallel so ...

[24 replies] Last: 1. srandom() and random() are not standard C functions. They're UNIX f... (by helios)

by LonlyNerds

Math Game c++ , division issue.

Hello Got a small problem here , I spent 2 days writing this with debugging sessions , alone, here is the thing its working and all but sometimes it just div...

[6 replies] Last: Hey guys thank you for your support , I did learn new stuff and yes I ... (by LonlyNerds)

by closed account 367kGNh0

How do call a function in a seperate class?

I made a function in, let's say class X like so. In the X.h I typed: void func(); In X.cpp void X::func(){} And I want to use func(); in class Y, in a me...

[2 replies] Last: How do I call a function from one class into another? You need to pas... (by coder777)

by frek

Enum class "put to" operator overloading

Hi all, Is the class Color defined below a scoped enum class? Is it due to the word class in its definition? int main() { enum class Color { red, blue, g...

[5 replies] Last: > What are the differences between these two, please? They are summar... (by JLBorges)

by MattC231

Trying to print elements of an array of derived classes

In main.cpp, when it gets to void printShapesInArray(...) , the print functiion of the corresponding shape in the array doesn't get called, I believe. main....

[5 replies] Last: > altMenu(shapesArr, arraySize); > Warning C6001 Using uninitialized m... (by ne555)

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