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General C++ Programming - October 2020 (Page 3)

C++ keyword definition request (1,2)

Hello. I did not know it, but, the C++ book I read was pretty outdated. And I would like to know what the following keywords do: #pragma , extern , template...

[26 replies] Last: Lol I like how I can always guess who reported my reply. @dutch Hahah... (by SirEnder125)

by jax16

Print all

https://www.cplusplus.com/forum/beginner/273399/

[3 replies] Last: What are you trying to do? Something like this? // Not tested. #in... (by SirEnder125)

by willie99

Context Switch

I need help with this code. Complete the code so that the output is: Main1 says Hello Main2 says Hello Main1 says Hello You are not allowed to manipulate ...

[8 replies] Last: Thank you. I got it working. (by willie99)

by oceanSpray

Converting 1d array output to look like a matrix

Hey ya'll, I'm trying to print a 1d array as a 2d matrix. I started off by creating a char array which hold 25 elements, I then created a pointer to a char ar...

[12 replies] Last: And that’s not to forget the speed increases that can be achieved by... (by againtry)

by closed account oG8qGNh0

Zombie Sandwich Shop Program

Zombie Sandwich Shop The BRAINS! Vision BRAINS! caters to a clientele that is extremely specific in their needs, demanding in their requirements, and hungry fo...

[12 replies] Last: Well what did you think was going to happen? :) (by Ganado)

by closed account 218pE3v7

Map and ofstream/ifstream

Hey guys So, I what I am trying to accomplish is I have a account class and a bank class. my bank class uses a map which stores the account object. upon startin...

[5 replies] Last: Without testing, I am not at my development PC at the moment, move yo... (by seeplus)

by thanhquan1704

Modified Secant Method

#include<iostream> #include<iomanip> #include<math.h> #include<stdlib.h> /* Defining equation to be solved. Change this equation to solve another problem. ...

[2 replies] Last: I guess you probably meant this one. It's more like a modified Newton-... (by lastchance)

by JUANDENT

boost::spirit::karma::generate not working as expected

Hi, I am taking a code sample from the documentation of Boost.Spirit (see https://www.boost.org/doc/libs/1_74_0/libs/spirit/doc/html/spirit/abstracts/attribu...

[5 replies] Last: the error is using boost::spirit::qi::int_ instead of karma::_int: thi... (by JUANDENT)

by pieterdehoogd

Function issue

Hello, I wrote a code in C++ that can encode and decode files. After that the programm have to check or numbers from the file are lychrel numbers. I used fun...

[4 replies] Last: Thankyou very much (by pieterdehoogd)

by Happy2bhere

Call and Search Help

I need help finishing the calling and searching for the binary and recursive areas. I have linear done but I don't know how to do the other two because of some ...

[4 replies] Last: As you're displaying the elapsed time in microseconds, why not have Ti... (by seeplus)

by jax16

Vector or Array

Howdy, need help with this. I didn't really get any help or an answer. original post http://www.cplusplus.com/forum/beginner/273332/ Really would like ...

[3 replies] Last: https://www.cplusplus.com/forum/beginner/273332/#msg1178932 (by againtry)

by markj

main() is not Main

I was totally blown away when I copied / pasted some C++ COM code into a MS Visual Studio Console App project... Trying to learn COM. When I started to trace...

[4 replies] Last: helios - OK... Thanks... I learned something about COM today: Cla... (by markj)

by SirEnder125

Visual Studio 2019 errors

Hello. I get the following errors every time I build with Visual Studio 2019: LNK4075 ignoring '/INCREMENTAL' due to '/OPT:ICF' specification Error LNK20...

[2 replies] Last: If you are wanting to test drive VS2019 I really, really, REALLY recom... (by deleted account xyzzy)

by rnima

Overloaded function Modulus

I need big help with figuring out Int operator%(const Int&); i havent started on division just yet because it looks like its going to be more complicated ...

[5 replies] Last: For 'ordinary' numbers division or modulo arithmetic can be carried ou... (by againtry)

by rnima

How to compute the size of an array with leading zeros

So basically i have an array of size 20, and i am wanting to store a number inside the array | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 | 4...

[4 replies] Last: @rnina, if it’s a genuine big-number class (which your notation does... (by lastchance)

by maor7583

help

Good afternoon friends I need help and guidance: I downloaded and installed the software on my computer C / C ++ for Visual Studio Code And I want to progra...

[1 reply] : No offense, but this question is like a caveman chiseling out a stone ... (by jonnin)

by SirEnder125

How are .dll files used??

Hello. I would like to know how to use a .dll in my program and what exactly a .dll does. If anyone can answer my question, please do. That's about it, thanks...

[9 replies] Last: I don't know what kind of project you're doing, but usually, if you wa... (by closed account D4Ev4iN6)

by ovufaco

Retrieving values from a web page

Hi I want to retrieve stock index values on a web page but when I execute the code it makes a mistake and displays nothing. Can someone tell me why? #incl...

[8 replies] Last: It's okay, I've got what I need. Thanks for giving me the idea to use ... (by ovufaco)

by pieterdehoogd

Reading numbers from textfile C++

Hey I've a textfile with letters and digits in it. I want to create a function that get integers from the textfile. I can do it for 9, 1, 3 etc but i fail to do...

[13 replies] Last: Consider: #include <iostream> #include <sstream> #include <cctype> ... (by seeplus)

by Jraysonn

How do I search a .txt file and print related lines in c++?

In my code, I want to have a function that goes through each line in a file and prints out the line if the first word in the sentence contains the number given ...

[7 replies] Last: Hello, What is the format of the file? Can you provide an example. ... (by seeplus)

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