Latest questions in C++

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Suggestions of excellent examples of real C/C++ code

I'd like to particularly bring up memcached.  ...READ MORE

Dec 17, 2022 in C++ by narikkadan
• 63,420 points
343 views
0 votes
0 answers

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
450 views
0 votes
0 answers

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
815 views
0 votes
0 answers

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
344 views
0 votes
0 answers

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
581 views
0 votes
0 answers

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
524 views
0 votes
0 answers

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
281 views
0 votes
0 answers

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
233 views
0 votes
0 answers

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
269 views
0 votes
0 answers

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
208 views
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0 answers

How to end C++ code

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

Aug 17, 2022 in C++ by Nicholas
• 7,760 points
208 views
0 votes
0 answers

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
969 views
0 votes
0 answers

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
369 views
0 votes
0 answers

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
273 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
397 views
0 votes
0 answers

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
333 views
0 votes
0 answers

memory allocation for objects

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

Aug 16, 2022 in C++ by Nicholas
• 7,760 points
274 views
0 votes
0 answers

How does "this" cascading work?

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

Aug 16, 2022 in C++ by Nicholas
• 7,760 points
194 views
0 votes
0 answers

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
237 views
0 votes
0 answers

memory allocation for objects

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

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

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
220 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
374 views
0 votes
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
397 views
0 votes
0 answers

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
362 views
0 votes
0 answers

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
346 views
0 votes
0 answers

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
658 views
0 votes
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
260 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
252 views
0 votes
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
653 views
0 votes
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
187 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
1,226 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
442 views
0 votes
0 answers

How do you properly use namespaces in C++?

I come from a Java background where ...READ MORE

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

What are Containers/Adapters? C++

What exactly are containers/adapters? I am familiar ...READ MORE

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

How do you open a file in C++?

I want to open a file in ...READ MORE

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

How come an array's address is equal to its value in C?

The pointer values and pointer addresses in ...READ MORE

Aug 8, 2022 in C++ by krishna
• 2,820 points
305 views
0 votes
0 answers

How can I get the size of a C++ function?

In C++, how can I find the size& ...READ MORE

Aug 5, 2022 in C++ by Nicholas
• 7,760 points
348 views
0 votes
0 answers

Nested try...catch inside C++ exception handler?

I may wish to run code that might throw an exception in my exception handler. Is the following C++ structure acceptable?  Are there any drawbacks if so? try { // ... } catch (const ...READ MORE

Aug 5, 2022 in C++ by Nicholas
• 7,760 points
309 views
0 votes
0 answers

How can I get double quotes into a string literal?

I used the printf() command to produce the output seen below: printf("She said time flies like an arrow, ...READ MORE

Aug 5, 2022 in C++ by Nicholas
• 7,760 points
509 views
0 votes
0 answers

std::string length() and size() member functions

While reading the responses to this topic, ...READ MORE

Aug 5, 2022 in C++ by Nicholas
• 7,760 points
650 views
0 votes
0 answers

Insert object at index of vector c++

I have to add a new item to the existing object vector.  Although I am aware that an iterator must be used, I am not entirely sure how it operates. I need to insert a new item by name in the precise index that I found after some searching into an alphabetically sorted vector.  I have this, then. vector<Person>people; int index =54; Person temp; people.push_back(temp);//insert at end of ...READ MORE

Aug 5, 2022 in C++ by Nicholas
• 7,760 points
464 views
0 votes
0 answers

How to make an array with a dynamic size? General usage of dynamic arrays (maybe pointers too)?

I wanna create a program that can ...READ MORE

Aug 5, 2022 in C++ by krishna
• 2,820 points
666 views
0 votes
1 answer

What's the difference between constexpr and const?

Variables are protected from modification in your ...READ MORE

Aug 5, 2022 in C++ by Damon
• 4,960 points
989 views
0 votes
1 answer

How do I create an array of pointers?

Student** db = new Student*[5]; // To allocate ...READ MORE

Aug 5, 2022 in C++ by Damon
• 4,960 points
639 views
0 votes
1 answer

Reverse Contents in Array

My strategy would be as follows: #include <algorithm> #include <iterator> int main() { const int ...READ MORE

Aug 5, 2022 in C++ by Damon
• 4,960 points
431 views
0 votes
1 answer

Create a reverse LinkedList in C++ from a given LinkedList

A simpler solution is to just let the current node point to the previous node while going through your linked list, saving the previous and next nodes as you go. void LinkedList::reversedLinkedList() { if(head == ...READ MORE

Aug 5, 2022 in C++ by Damon
• 4,960 points
519 views
0 votes
1 answer

Why should I use reference variables at all?

References themselves are unrelated to the issue. The issue is because C++ manages object lifetimes differently from run-time systems that employ garbage collectors, such as Java.  There is no standard built-in garbage collector in C++.  Both automatic (within local or global scope) and manual (explicitly allocated/deallocated in heap) object lifetimes are possible in  C++. A C++ reference is nothing more than an object's alias.  It has no knowledge of object lifespan (for the sake of efficiency).  The coder must give it some thought.  A reference bound to a temporary object is an exception; in this situation, the temporary object's lifespan is prolonged to include the lifetime of the bound reference. References play a crucial role in the fundamental ideas of C++, and they are required for 90% of jobs.  Otherwise, pointers must be used, which is typically far worse. You can use references, for instance, when you need to give an object as a function parameter by reference rather than by value: void f(A copyOfObj); ...READ MORE

Aug 5, 2022 in C++ by Damon
• 4,960 points
373 views
0 votes
1 answer

Socket Programming in C++

The C++ Standard does not have a ...READ MORE

Aug 2, 2022 in C++ by Damon
• 4,960 points
504 views
0 votes
1 answer

"We do not use C++ exceptions" — What's the alternative? Let it crash?

If you don't utilise exceptions, by definition, ...READ MORE

Aug 2, 2022 in C++ by Damon
• 4,960 points
303 views