Most answered questions in C++

0 votes
0 answers

How to pass reference-to-function into another function

Using function pointers as arguments for other ...READ MORE

Jul 11, 2022 in C++ by Nicholas
 • 7,760 points • 785 views
0 votes
0 answers

Difference between for loop and the range based loop in C++

The distinction between a for loop and ...READ MORE

Jul 11, 2022 in C++ by Nicholas
 • 7,760 points • 825 views
0 votes
0 answers

How does c++ std::vector work?

How do the addition and removal of ...READ MORE

Jul 11, 2022 in C++ by Nicholas
 • 7,760 points • 842 views
0 votes
0 answers

Inbuilt __gcd(A,B) function in C++

I recently learned about a c++ specia ...READ MORE

Jul 11, 2022 in C++ by Nicholas
 • 7,760 points • 630 views
0 votes
0 answers

What is the difference between ifstream, ofstream and fstream?

I stumbled discovered ifstream, ofstream, and fstream ...READ MORE

Jul 11, 2022 in C++ by Nicholas
 • 7,760 points • 1,147 views
0 votes
0 answers

How to access static members of a class?

I'm learning C++ and Qt, but even the simplest code that I copy and paste from a book produces problems. On Ubuntu 10.04, I'm using g++4.4.2 with the QtCreator IDE.  Is there a distinction between the syntax of the g++ compiler and those of other compilers?  When I try to access static members, for example, something always goes wrong. #include <iostream> using namespace std; class A { ...READ MORE

Jul 7, 2022 in C++ by Nicholas
 • 7,760 points • 798 views
0 votes
0 answers

How to copy turbo c++ output?

How can I replicate the output of Turbo C++?  I had already Googled the issue, but in vain.  It suggests to either print scrn and paste or right click, select all, and paste.  I tried both, but neither worked.  The issue is that it simply copies what is on the current screen.  But I want the entire screen from the start.  (Alt+printscrn is also ineffective).  What should I do in this situation? printScrn Alt+printScrn markall None of them are operational!! I can't assist you if you require this archaic technique of programming for whatever reason, but I'd want to find a solution.  I tried forwarding the output stream to the file in this manner, but it did not work. #include<iostream.h> #include<conio.h> #include<stdlib.h> const int max=50; class dequeue{ int dq[max],r,f,c,x,i; public: dequeue(); void insertRear(); void insertFront(); void ...READ MORE

Jul 7, 2022 in C++ by Nicholas
 • 7,760 points • 1,739 views
0 votes
0 answers

How to use enums in C++

Suppose we have an enum like the following: enum Days ...READ MORE

Jul 7, 2022 in C++ by Nicholas
 • 7,760 points • 805 views
0 votes
0 answers

Differences between C++ string == and compare()?

I just read some recommendations on using std::string ...READ MORE

Jul 7, 2022 in C++ by Nicholas
 • 7,760 points • 692 views
0 votes
0 answers

What does the C++ standard state the size of int, long type to be?

I'm seeking for specific information on the sizes of basic C++ types.  I understand that it is determined by the architecture (16 bits, 32 bits, or 64 bits) and the compiler. But are there any C++ standards? On a 32-bit architecture, I'm using Visual Studio 2008.  This is what I get: char : 1 byte short : 2 ...READ MORE

Jul 7, 2022 in C++ by Nicholas
 • 7,760 points • 564 views
0 votes
0 answers

What does the C++ standard state the size of int, long type to be?

I'm seeking for specific information on the sizes of basic C++ types.  I understand that it is determined by the architecture (16 bits, 32 bits, or 64 bits) and the compiler. But are there any C++ standards? On a 32-bit architecture, I'm using Visual Studio 2008.  This is what I get: char : 1 byte short : 2 ...READ MORE

Jul 5, 2022 in C++ by Nicholas
 • 7,760 points • 668 views
0 votes
0 answers

Sorting a vector in descending order

Should I  utilize  std::sort(numbers.begin(), numbers.end(), std::greater<int>()); or std::sort(numbers.rbegin(), numbers.rend()); // ...READ MORE

Jul 5, 2022 in C++ by Nicholas
 • 7,760 points • 2,750 views
0 votes
0 answers

How to use setprecision in C++

I'm new to C++ and all I want to do is print my point number up to two digits.  For example, if the number is 3.444, the output should be 3.44, and if the number is 99999.4234, the output should be 99999.42.  How am I going to do that?  The value changes over time.  This is my code. #include <iomanip.h> #include <iomanip> int main() { ...READ MORE

Jul 5, 2022 in C++ by Nicholas
 • 7,760 points • 1,070 views
0 votes
0 answers

Difference between upper_bound and lower_bound in stl

I was looking at how the upper bound and lower bound algorithms operate in stl on these pages: lower bound, upper bound, and it's documented the same way on these pages: lower bound, upper bound, and it's documented the same way on these pages: lower bound, upper bound, and it'  upper bound, lower bound Looking at the code from the links, they appear to perform the same thing to me, with the exception of the following lines  lower_bound (line 10): if (*it<val) { ...READ MORE

Jul 5, 2022 in C++ by Nicholas
 • 7,760 points • 1,476 views
0 votes
0 answers

Why doesn't C++ have a garbage collector?

First and foremost, I'm not raising this ...READ MORE

Jul 5, 2022 in C++ by Nicholas
 • 7,760 points • 836 views
0 votes
0 answers

C++ Singleton design pattern

I recently came upon a C++ realization/implementation of the Singleton design pattern.  It looked like this (I took it from a real-life example): // a lot of methods are omitted ...READ MORE

Jul 4, 2022 in C++ by Nicholas
 • 7,760 points • 679 views
0 votes
0 answers

When and why do I need to use cin.ignore() in C++?

In C++, I developed a simple application that requested the user to enter a number and then a string.  Surprisingly, when I ran the application, it never paused to ask for the string.  It simply ignored it.  After conducting some research on StackOverflow, I discovered that I needed to include the following line: cin.ignore(256, '\n'); before the line with the string input  That addressed the problem and allowed the software to run.  My issue is why C++ need the cin.ignore() line, and how can I forecast when I will need to use it. Here's the software I created: #include <iostream> #include <string> using namespace std; int main() { ...READ MORE

Jul 4, 2022 in C++ by Nicholas
 • 7,760 points • 1,118 views
+1 vote
0 answers

Parse (split) a string in C++ using string delimiter (standard C++)

In C++, I'm processing a string like follows: using namespace std; string parsed,input="text to be parsed"; stringstream ...READ MORE

Jul 4, 2022 in C++ by Nicholas
 • 7,760 points • 1,142 views
0 votes
0 answers

How to choose between map and unordered_map?

Assume I wanted to map data that ...READ MORE

Jul 4, 2022 in C++ by Nicholas
 • 7,760 points • 764 views
0 votes
0 answers

Why use #define instead of a variable

What is the purpose of the #define ...READ MORE

Jul 1, 2022 in C++ by Nicholas
 • 7,760 points • 579 views
0 votes
0 answers

C++ printing boolean, what is displayed?

I print a bool to an output stream like ...READ MORE

Jul 1, 2022 in C++ by Nicholas
 • 7,760 points • 683 views
0 votes
0 answers

Static vs dynamic type checking in C++

I'm curious in the differences between static ...READ MORE

Jul 1, 2022 in C++ by Nicholas
 • 7,760 points • 895 views
0 votes
0 answers

take string input using char* in C and C++

I'm having trouble accepting a string (actually a character array) as input.  Consider the following declaration: char* s; I have to input a string ...READ MORE

Jul 1, 2022 in C++ by Nicholas
 • 7,760 points • 726 views
0 votes
0 answers

How to use c++ swap function?

It is OK to write swap(a,b); There is an issue when I write swap(&c[0],&d[0]);.  Can anyone explain why? #include<iostream> #include<algorithm> using namespace std; int main(void){ ...READ MORE

Jul 1, 2022 in C++ by Nicholas
 • 7,760 points • 583 views
0 votes
0 answers

Reverse a number without converting it to string in C++

I'm attempting to write a programme in C++ to reverse a number. It works well with numbers like 1234, but when I try to enter a number like 5430, it displays 345, and the same with numbers that begin with zero, such as 0234, which displays 432. Could someone please explain how to deal with zeros at the beginning and end of a sentence? I simply need to save the number without converting it to a string. #include<iostream> using namespace std; int main(){ ...READ MORE

Jun 30, 2022 in C++ by Nicholas
 • 7,760 points • 869 views
0 votes
0 answers

Infix to Postfix notation C++

Hello there, Stack.  I'm currently learning C++ and trying to create an RPN converter.  But I'm having difficulties.  Hopefully, I'll be able to describe the issues in detail.  For stacking my operators, I'm using an array.  Let's look at the example "5 + 8."  When it comes down to: else if(infix[i] == '+' or infix[i] == ...READ MORE

Jun 29, 2022 in C++ by Nicholas
 • 7,760 points • 1,100 views
0 votes
0 answers

How does the modulus operator function?

Assume I need to prepare an array's ...READ MORE

Jun 29, 2022 in C++ by Nicholas
 • 7,760 points
edited Mar 4 • 125 views
0 votes
0 answers

Is the std::set iteration order always ascending according to the C++ specification?

According to what I've read, std::set in ...READ MORE

Jun 29, 2022 in C++ by Nicholas
 • 7,760 points • 688 views
0 votes
0 answers

Deep copy vs Shallow Copy

What's the distinction between deep and shallow ...READ MORE

Jun 29, 2022 in C++ by Nicholas
 • 7,760 points • 808 views
0 votes
0 answers

C++ convert from 1 char to string?

I simply need to cast one character to string.  The inverse method is as easy as str[0]. The following suggestions did not work for me: char c = 34; string(1,c); //this doesn't work, the ...READ MORE

Jun 29, 2022 in C++ by Damon
 • 4,960 points • 1,417 views
0 votes
0 answers

Selection sort in C++ (modified) not working for all cases

I was attempting to tweak the selection sort code in C++ in order to test the results.  My updated code is as follows: #include<bits/stdc++.h> using namespace std; int main() { ...READ MORE

Jun 29, 2022 in C++ by Damon
 • 4,960 points • 735 views
0 votes
0 answers

What is the STL?

I'm not a C++ coder, thus I ...READ MORE

Jun 29, 2022 in C++ by Damon
 • 4,960 points • 611 views
0 votes
0 answers

Difference between set.upper_bound() and upper_bound(set.begin(), set.end()) stl

I discovered that set.upper bound() was quicker ...READ MORE

Jun 29, 2022 in C++ by Damon
 • 4,960 points • 698 views
0 votes
0 answers

Why are exceptions so rarely used in C++

I've been writing in C++ on and ...READ MORE

Jun 29, 2022 in C++ by Damon
 • 4,960 points • 552 views
0 votes
0 answers

Sorting Characters Of A C++ String

Is there a built-in method for sorting characters in a string, or do I have to construct my own? for instance: string word = "dabc"; I would want to ...READ MORE

Jun 27, 2022 in C++ by Nicholas
 • 7,760 points • 653 views
0 votes
0 answers

How to use the priority queue STL for objects?

class Person { public: int age; }; I'd want to put objects of the type Person in a priority queue. priority_queue< ...READ MORE

Jun 27, 2022 in C++ by Nicholas
 • 7,760 points • 711 views
0 votes
0 answers

Can you use "cin" with string?

To enter a string, I was instructed to use gets(str) rather than cin.  In the programme below, though, I can use cin perfectly well.  Could you please tell me if you can use cin?  Please accept my apologies for my poor English.  The application allows you to enter up to five names and then print them on the screen. The code is as follows: #include <iostream> #include <string.h> using namespace std; int main() { ...READ MORE

Jun 27, 2022 in C++ by Nicholas
 • 7,760 points • 575 views
0 votes
0 answers

C++ pointer to objects

Is it always necessary in C++ to  ...READ MORE

Jun 27, 2022 in C++ by Nicholas
 • 7,760 points • 692 views
0 votes
0 answers

How can I get the maximum or minimum value in a vector?

In C++, how can I find the greatest or minimum value in a vector? Is it correct to assume that it would be similar with an array? Do I require an iterator?  I tried max element, but I kept receiving errors. vector<int>::const_iterator it; it = max_element(cloud.begin(), cloud.end()); error: request for ...READ MORE

Jun 27, 2022 in C++ by Nicholas
 • 7,760 points • 800 views
0 votes
0 answers

What is the easiest way to initialize a std::vector with hardcoded elements?

I can make an array and initialise&nb ...READ MORE

Jun 27, 2022 in C++ by Nicholas
 • 7,760 points • 779 views
0 votes
0 answers

Difference between 'new operator' and 'operator new'?

What is difference between "new operator" and ...READ MORE

Jun 15, 2022 in C++ by Nicholas
 • 7,760 points • 557 views
0 votes
0 answers

static memory allocation like dynamic memory allocation

int r, c; cin >> r >> c; int ...READ MORE

Jun 6, 2022 in C++ by Nicholas
 • 7,760 points • 847 views
0 votes
0 answers

functions in c++ call by value and call by reference

The code below shows how to call a function in both methods.  Please explain the major differences or meanings of call by value and call by reference to me.  1.Make a value-based call.  2.Call based on a reference.  The call by value method is demonstrated in the following code. In a comment, I expressed my reservations. #include<iostream> int main(){ void change(int);//why function prototype is before ...READ MORE

Jun 6, 2022 in C++ by Nicholas
 • 7,760 points • 765 views
0 votes
0 answers

Use of min and max functions in C++

Are std::min and std::max better than fmin ...READ MORE

Jun 2, 2022 in C++ by Nicholas
 • 7,760 points • 851 views
0 votes
0 answers

Constructor Overloading in C++

My C++ overloading does not work as I expect it to: #include "Node.h" #include <iostream> Node::Node() { cout ...READ MORE

Jun 2, 2022 in C++ by Nicholas
 • 7,760 points • 571 views
0 votes
0 answers

Code Not working in VS Code but works in OnlineGDB

I am practicing about primeSieve with C++ language in VS Code 1.57.1. Can ...READ MORE

Jun 1, 2022 in C++ by Nicholas
 • 7,760 points • 1,006 views
0 votes
0 answers

How to implement 2D vector array?

I'm using the vector class in the ...READ MORE

Jun 1, 2022 in C++ by Nicholas
 • 7,760 points • 594 views
0 votes
0 answers

How to implement 2D vector array?

I'm using the vector class in the ...READ MORE

Jun 1, 2022 in C++ by Nicholas
 • 7,760 points • 836 views
0 votes
0 answers

What is the C++ function to raise a number to a power?

What's the best way to raise a n ...READ MORE

Jun 1, 2022 in C++ by Nicholas
 • 7,760 points • 769 views
0 votes
0 answers

How to traverse stack in C++?

Is traversing std::stack possible in C++? It is not possible to traverse using the following method.  Because there is no member end in std::stack. std::stack<int> foo; // .. for (__typeof(foo.begin()) it = foo.begin(); ...READ MORE

Jun 1, 2022 in C++ by Nicholas
 • 7,760 points • 2,657 views
Page:

Most popular tags

"PMP®","PMI®", "PMI-ACP®" and "PMBOK®" are registered marks of the Project Management Institute, Inc. MongoDB®, Mongo and the leaf logo are the registered trademarks of MongoDB, Inc.