Most answered questions in C++

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Simple linked list in C++

This is the most basic example I can think of in this situation, and it has not been tested.  Please keep in mind that this violates some C++ best practises and deviates from the norm (initialize lists, separation of declaration and definition, and so on).  But those aren't topics I can discuss here. #include <iostream> using namespace std; class LinkedList{ ...READ MORE

Jun 2, 2022 in C++ by Damon
 • 4,960 points • 621 views
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What is a smart pointer and when should I use one?

A smart pointer is similar to a ...READ MORE

Jun 2, 2022 in C++ by Damon
 • 4,960 points • 282 views
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Check if element is in the list (contains)

The simplest and quickest method. You could also ...READ MORE

Jun 2, 2022 in C++ by Damon
 • 4,960 points • 1,601 views
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Using getline() in C++

If you use getline() after cin >> anything, you must first flush the newline character from the buffer.  You can achieve this by using the cin.ignore() It would be something like this: string messageVar; cout ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 594 views
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How to use std::sort to sort an array in C++

We receive std::begin and std::end in C++0x/11, which are overloaded for arrays: #include <algorithm> int main(){ int v[2000]; ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 907 views
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Why does C++ need the scope resolution operator?

No. There is no scope resolution operator ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 683 views
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Why is "using namespace std;" considered bad practice?

This has nothing to do with performan ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 650 views
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How to reverse an std::string?

A reverse function is integrated into C++ and can be used to reverse a string.  This function accepts two parameters: The start iterator for the string The string iterator has come to an end. The following line of code demonstrates how to use this function: #include <iostream> //The library below must be included ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 363 views
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The Definitive C++ Book Guide and List

For Beginner (includes those without coding experience) Programming: ...READ MORE

Jun 6, 2022 in C++ by pranav
 • 2,590 points • 523 views
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Sorting a vector of custom objects

A simple example using std::sort struct MyStruct { ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 996 views
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How can I convert a std::string to int?

There are some new convert methods in C++ that convert std::string to a numeric type. As an alternative to str.c str() atoi(str.c str()) atoi(str.c str() you can make use of std::stoi std::stoi ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 496 views
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Why would anyone use set instead of unordered_set?

Unordered sets must compensate for their O(1) ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 2,367 views
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Easiest way to convert int to string in C++

C++ adds std::stoi (and variants for each numeric type) and std::to string, which are the C equivalents of atoi and itoa but expressed in terms of std::string #include <string> std::string s = std::to_string(42); Is therefore ...READ MORE

Jun 1, 2022 in C++ by Damon
 • 4,960 points • 1,036 views
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C++ `this` pointer

Pointer variables are used to store the ...READ MORE

May 31, 2022 in C++ by Damon
 • 4,960 points • 359 views
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What data structure is inside std::map in C++?

An associative container is std::map. The standard's ...READ MORE

May 31, 2022 in C++ by Damon
 • 4,960 points • 627 views
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Syntax of priority queue

We must first include the queue header file in order to establish a priority queue in C++. #include <queue> Once we import this file, we ...READ MORE

May 31, 2022 in C++ by Damon
 • 4,960 points • 329 views
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Declare abstract class in c++

An abstract class is one that is intended to be used as a base class .  At least one pure virtual function exists in an abstract class.  A pure virtual function is declared in the class declaration by using a pure specifier (= 0) in the declaration of a virtual member function. Here is an example of an abstract class: class AB { public: virtual void f() ...READ MORE

May 31, 2022 in C++ by Damon
 • 4,960 points • 403 views
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why are copy constructors needed and what are the cases where they are very helpful?

A copy constructor is a member function ...READ MORE

May 31, 2022 in C++ by Damon
 • 4,960 points • 495 views
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Check if element found in array c++

How can I see if the element ...READ MORE

Nov 17, 2022 in C++ by Ashwini
 • 5,430 points • 469 views
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Best way to split a vector into two smaller arrays?

I'm attempting to divide a vector into ...READ MORE

Nov 17, 2022 in C++ by Ashwini
 • 5,430 points • 836 views
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Correct way to work with vector of arrays

Could someone please explain how to work ...READ MORE

Aug 23, 2022 in C++ by Nicholas
 • 7,760 points • 355 views
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Read whole ASCII file into C++ std::string

I need to load an entire file ...READ MORE

Aug 23, 2022 in C++ by Nicholas
 • 7,760 points • 600 views
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Making a class abstract without any pure virtual methods

I take a class where we watch ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 544 views
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Differentiate between function overloading and function overriding

Differentiate between function overloading and function overriding ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 294 views
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What is the point of function pointers?

The purpose of function pointers is difficult ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 247 views
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What are the differences between struct and class in C++?

I now want to understand the distinctions ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 282 views
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What does '&' do in a C++ declaration?

As a C person, I'm attempting to comprehend some C++ code.  The declaration of my function is as follows: int foo(const string &myname) { cout ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 223 views
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How to end C++ code

I want my C++ code to terminate  ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 217 views
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get absolute value without using abs function nor if statement

How might I obtain an integer's absolute ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 987 views
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How do I set up Visual Studio Code to compile C++ code?

Although the Visual Studio Code editor from ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 391 views
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What is the difference between std::list<std::pair> and std::map in C++ STL?

What distinguishes std::list<std::pair> from std::map? Does the ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 299 views
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Remove elements of a vector inside the loop

I am aware that there are questions like this one, but I was unable to use them to help me decipher my code.  I just want to remove or delete one element from a vector by running a loop over its property.  How can I go about doing that?  I tried the following code, but I got an ambiguous error message: 'operator =' function is unavailable in 'Player’. ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 409 views
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Why is the size of an empty class in C++ not zero?

Why does the following output 1? #include <iostream> class Test { }; int ...READ MORE

Aug 17, 2022 in C++ by Nicholas
 • 7,760 points • 344 views
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memory allocation for objects

In C++, a variable like int x ...READ MORE

Aug 16, 2022 in C++ by Nicholas
 • 7,760 points • 287 views
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How does "this" cascading work?

The following class interface I have is: ...READ MORE

Aug 16, 2022 in C++ by Nicholas
 • 7,760 points • 204 views
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Why was the ampersand chosen as the symbol for references in C++?

Does anyone know why the ampersand was ...READ MORE

Aug 16, 2022 in C++ by Nicholas
 • 7,760 points • 254 views
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memory allocation for objects

When we instantiate a variable in C++, ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 301 views
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0 answers

(->) arrow operator and (.) dot operator , class pointer

In C++, we know that given a class pointer, we use the (->) arrow operator to access the members of that class, as seen here: #include <iostream> using namespace std; class myclass{ ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 449 views
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What is a stream in C++?

I've been hearing a lot about streams, ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 240 views
0 votes
0 answers

How to Access Subgraphs of an Existing Graph in Boost

I read a graph using read graphviz() ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 399 views
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0 answers

Is there a maxheap in the C++ standard library?

I understand that the std::priority queue class ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 429 views
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how to print \" in C++

I need to print the following string: std::string("-I\"/path/to/dir\" "); Basically, I need to accomplish this since I am generating C++ code using C++ code. I want to use an ofstream to write the above string, so something like ofstream fout; fout << the_string ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 371 views
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Efficient way to return a std::vector in c++

When delivering a std::vector in a function, how much data is duplicated, and how much of an optimization will it be to place the std::vector in free-store (on the heap) and provide a pointer instead, i.e. is: std::vector *f() { std::vector *result = new ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 376 views
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std::cin input with spaces?

#include <string> std::string input; std::cin >> input; The user want to type "Hello World."  However, cin fails to recognise the space between the two words.  How do I get Cin to see the entire Hello World? I'm trying this using structs, and cin.getline doesn't appear to work.  This is my code: struct cd { ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 677 views
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0 answers

In C, are arrays pointers or used as pointers?

First, look at this code When this is ...READ MORE

Aug 11, 2022 in C++ by krishna
 • 2,820 points • 270 views
0 votes
0 answers

How to generate a random number in C++?

I'm attempting to develop a dice game, and I need random numbers to represent the sides of the die.  I can make a number between 1 and 6).  Using #include <cstdlib> #include <ctime> #include <iostream> using namespace ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 262 views
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0 answers

declaring a priority_queue in c++ with a custom comparator

I'm attempting to declare a priority queue of nodes using the comparator function bool Compare(Node a, Node b) (which is outside the node class). I presently have the following: priority_queue<Node, vector<Node>, Compare> openSet; I'm receiving Error: "Compare" is not a type name for some reason. Adding priority_queue<Node, vector Node>, bool Compare> to the declaration. gives me the error 'Error: expecting a '>' I've also attempted: priority_queue<Node, vector<Node>, Compare()> openSet; priority_queue<Node, ...READ MORE

Aug 11, 2022 in C++ by Nicholas
 • 7,760 points • 692 views
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0 answers

Confused with object arrays in C++

I have some Java knowledge and now ...READ MORE

Aug 11, 2022 in C++ by krishna
 • 2,820 points • 212 views
0 votes
0 answers

Is C++ considered weakly typed? Why?

C++ has always struck me as one ...READ MORE

Aug 8, 2022 in C++ by Nicholas
 • 7,760 points • 1,257 views
0 votes
0 answers

Difference between 'struct' and 'typedef struct' in C++?

In C++, is there any difference between: struct Foo ...READ MORE

Aug 8, 2022 in C++ by Nicholas
 • 7,760 points • 462 views
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