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Beginners - August 2018 (Page 7)

Please explain and help me fix these compiler errors and warnings

Please explain the compiler errors and warnings: alistair@alistair-Satellite-Pro-L300D:~/C++Practice/AnIntroductionToProgramming$ g++ q2ch11.cpp -std=c++11 -...

[2 replies] Last: -fpermissive Do not do this. Instead, write correct C++. (by Repeater)

by AL88

why cant I make square take one perimeter whilst rectangle takes two?

My book is asking me to make the rectangle class constructor just take length whilst making rectangle take width and lenght , how do i get it to compile? ...

[3 replies] Last: The "virtual" mechanism doesn't come into effect unless you use pointe... (by tpb)

by sebbedb

How to organize classes for correct access

I'm fairly new to OOP, and right now i'm stuck on the correct way to allow multiple classes to have the correct access rights to each other. So, i have three c...

[1 reply] : You forgot to mention who owns what. From your second paragraph I assu... (by helios)

by PhysicsIsFun

choose random vector entry (1,2,3)

Hi guys, is there an easy way to choose an integer between 0 and N? To be more precise, I want to randomly(!) choose an element from a vector, so I thought ...

[54 replies] Last: Thank you guys, you have been a great help :)! (by PhysicsIsFun)

by oayrancioglu

Reading certain values of a vector and write them into another vector

Greetings, I couldn't succeed on doing that. Here's basic parts of my code that i tried to read certain rows within a vector and tried to write them into anoth...

[2 replies] Last: Hello, Does QLT.size() == 0 at line 1? Yes. I tried "Push back" ... (by oayrancioglu)

by Stuffman

A vector of unique_ptrs pointing to unique_ptrs

Sorry for such a basic question, I'm coming back to C++ after like 15 years and having a really hard time finding sources that explain how vectors interact with...

[2 replies] Last: About using std::vector<Room*>, I was under the impression that I woul... (by Stuffman)

by jamesgodspower

network connection

hello guys, please i want to develop an application that connect devices together so to receive and send files, and message. example: a laptop who has my appli...

[1 reply] : Take a look at boost asio: https://www.boost.org/doc/libs/1_68_0/doc/... (by coder777)

by PhysicsIsFun

Hard spheres - check for overlap (1,2)

Greetings, in a Monte Carlo simulation of N hard spheres, radius R>0, I randomly choose a sphere and propose a new position for this particle in the direct vic...

[30 replies] Last: ah ok, yeah, it might help that I just have to update one row of the a... (by PhysicsIsFun)

by l0gic

Heap Array

Hello, I am new in C++ enviroment. I was a C programmer for 2 years. After knowing so much about it, I decieded to move to somthing bigger like Java or C++. I d...

[11 replies] Last: When you paste code and the editor needs to insert line breaks in the... (by Peter87)

by surfersss

%*s means in sscanf

Write your question here. #include <stdio.h> int main () { char sentence ="Rudolph is 12 years old"; char str ; int i; sscanf (sentence,"%s %*s...

[1 reply] : https://en.cppreference.com/w/cpp/io/c/fscanf %*s causes a string t... (by mbozzi)

by holyheck

No clue how to deal with this error

I'm trying to make a program which gives me all the words that have a certain number of letters, it gives me the error: "invalid conversion from 'char' to 'cons...

[5 replies] Last: also, @holyheck, is there a reason you're trying to work with C-style ... (by icy1)

by RCPP

Defining A Range

Hello everyone. I am stuck at a point where my program won't go for a loop. I'm trying to define a range of numbers and not with vectors or arrays but with a fo...

[19 replies] Last: [quote=rcpp]Last but not the least, what should I do if I want numbers... (by lastchance)

by Issa

Error

Hi I have written according to the instruction but I still gett an error. According to data, it says that it can not find the file or directory. Dont kno...

[4 replies] Last: OK, Thank you icy1 and FurryGuy for the help/information. I considerin... (by Issa)

by teodor0xcb

Pointer not returning the way I was expecting to

I have decided to overload the builtin 'string' class and create my own custom String class in order to improve my knowledge regarding operators overloading in ...

[12 replies] Last: Thank you very much for all your replies! I now understand how things ... (by teodor0xcb)

by anyliser342

how to share a int with a function

i want to share the selection in main with the down function and get de comfirmation of my selection including the 2 cout (in main and selection) #inclu...

[1 reply] : #include <iostream> int choice( int min_value, int max_value ) { ... (by JLBorges)

by lambavvv

Filling a vector of non-integer type using a for loop

I've got a function that initializes objects of Enemy class (just once), expanding the vector of <Enemy> class type. A for loop doesn't work, however, as it tri...

[6 replies] Last: Yeah, I did now. As a matter of fact, I had done that in other classes... (by lambavvv)

by DesmondLee

Help! Matching numbers

The user has to guess 6 numbers before they are generated. Your program will then tell the user what are the matched numbers. If the user chooses any number les...

[11 replies] Last: you are doing great. Now that you have it working consider these idea... (by jonnin)

by John Karror

passing a value from one code to another

It's my first time writing a real program (UI and stuff) I am using GTK+ with C. My program is written in C++, and I also have some simple ones in python. ...

[2 replies] Last: You're asking about "inter process communication". https://en.wikiped... (by Repeater)

by philip1999

why the player is not switching between "X" and "O"?

I cannot understand why the player is not switching between "X" and "O"? #include<stdio.h> #include<iostream> using namespace std; char matrix = ...

[4 replies] Last: @philip1999, Please read @mbozzi's post. You need that ampersand & in ... (by lastchance)

by tghatem

Visual Studio - Windows application

Hello, I am looking for advise. I want to use VS to program a window (s), that have a library of electrical components like, bus, Line, Generator, transfo...

[3 replies] Last: Hi Andy, Thank you for the advise. The core program that I created ba... (by tghatem)

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