Beginners - C++ Forum - August 2019 (Page 2)

How do you do it? It super confusing to me

[2 replies] Last: Thanks! :) (by highwayman)

How to generate a vector [1, 2, 3 ..., N] efficently?

My question is simple here: How to generate a vector [1, 2, 3 ..., N] efficently? Any speed up idea would be okay. (SIMD?) Assume to build such a vector in run...

[6 replies] Last: > generate a vector [1, 2, 3 ..., N] > [n = N] () mutable { return n... (by ne555)

by closed account 17Mo1hU5

constant timestamp

I have a class named message and I want to be able to tag it with a timestamp, so then I can write the tag on a .txt file. Yet, I have no clue how to make the t...

[1 reply] : > how to make the timestamp constant, so it doesen't change every sing... (by ne555)

by CodeNovice01

Adding a comma into calculated numbers

Hello everyone, I was writing some code for a C++ class, and I am curious if there is any way to add a comma into your output? For example, let's say one calcu...

[8 replies] Last: @Handy Andy, I believe that using the native locale is in many cases t... (by mbozzi)

by colt

Can't open text file, no matter what

Hello. I am currently trying to open a text file and being unable to do so until now. I already checked: 1)The File name. I did a copy and paste from the fil...

[4 replies] Last: Hello colt, When I tried to make the program work I found one problem... (by Handy Andy)

by HottoDogu

Can't find problem with Search function in Hash List

Hello, i made a List registry to store contacts, with name, city and cpf(id number), and search them by their cpf. However, the search function doesn't find ...

[3 replies] Last: This looks like C, not C++. If you're using C++ then this code could b... (by dhayden)

by n00b2000

error: 'm_controller' was not declared in this scope

Hello, I am trying to add my function: void Check(void) { while(true) { Sleep(1000); bool Founded = IsPr...

[4 replies] Last: Notice all the other functions in that file look like: void xmrig::A... (by Ganado)

by closed account SECMoG1T

linker error

I have a large project that I am working on and when compiling I got a weird linker error and I can't pin the cause, I have managed to reproduce the error in a ...

[5 replies] Last: @coder777 that was in response to @salem c request for the actual erro... (by closed account SECMoG1T)

by jakesalomon

Explicit destructor call ==> program freeze

Hi all. I am using Bucky's C++ tutorials on YouTube at: (https://www.youtube.com/watch?v=mUQZ1qmKlLY&feature=youtu.be) Although it recommends using the "...

[11 replies] Last: Going off of what @jonnin said: [quote=jonnin]I mean you can still mes... (by TheToaster)

by CakeByTheOcean

Is it possible to resize a vector using iterator

I want to ask if it is possible to resize on a vector itertor, in order to get such a vector resized? #include <iostream> // std::cout #include <iterato...

[2 replies] Last: *first isnt a vector, its an int. ^^^ explicitly stating what he said... (by jonnin)

by TheToaster

Lambda Capture Block

Can someone please give an example as to what the difference between the following? auto lambda1 = [ this]{ /*...*/ }; auto lambda2 = [*this]{ /*...*/ ...

[1 reply] : You're exactly right. This is generally useful if you plan to change ... (by Albatross)

by adlice870012

I have to solve this code i am not able to do please help anyone.

Remove alternate elements from array starting from index 0 till only one element is left in the array and display that element. Design a new number such that 0...

[6 replies] Last: i am not able to code anything. i dont know where to start. i am conf... (by George P)

by XboxOne2019

Crud Program using Fibonacci numbers

Hello, we are supposed to write a program to find the population of crud after a certain period of time using 3 different types of loops. I will post the questi...

[4 replies] Last: Thank you! I took what you posted and modified it in mine and it works... (by XboxOne2019)

by stoneJax

Vectors

I am trying to convert a given program from using c-string array and a dynamic array to a vector. The program asks the user to enter how many scores they would ...

[6 replies] Last: That makes sense now. Thank you. (by stoneJax)

by ivy414

Can you help me write program- auto pick up lotto numbers?

Hi, I would like to run a program that auto pick up 5 numbers from 45 (1 to 45), no duplicate number. The odd number must have higher drawn percentage. (mean th...

[12 replies] Last: Trying to write this program using the C libraries only would be a who... (by George P)

by alien51

Reading eof but not eof

I am attempting to write a program that reads a random html file I pulled. Some reason when I attempt to read the file with the following code. while(!i...

[3 replies] Last: I am running the code in the IDE jgrasp, I assume it's like running in... (by alien51)

by highwayman

cin >> (pointer to char); (1,2)

when I cin a pointer to char, I create an array of chars. Why does this work? Is this 'undefined' behavior? Is this natural? Am I actually just #include ...

[24 replies] Last: So some things do not need to have locks because they already have har... (by highwayman)

by robgeek

Declaring 2d array as argument of function in .h file. (1,2)

Hi! How can I declare a function prototype in .h file that receives a 2d array with variable dimensions? Here what I tried. test.h // this 2d array w...

[20 replies] Last: I suppose c99 is 20 years old and going strong, though. No reason to... (by jlb)

by OhMyJosh1k

Guessing a random number

i am not getting any syntax errors but it is not working properly. #include <iostream> #include <cstdlib> #include <ctime> using namespace std; i...

[5 replies] Last: Hello OhMyJosh1k, To go with what Furry Guy has said I found this v... (by Handy Andy)

by highwayman

Delete[] vs delete

if I were to call delete on a pointer where I had only called new type instead of new type , how bad would that be? int * a; a = new int; delet...

[3 replies] Last: Alright, thank you! :) (by highwayman)

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Beginners - August 2019 (Page 2)