Most viewed questions in C++

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Passing a 2D array to a C++ function

There are three ways to pass a ...READ MORE

Aug 2, 2022 in C++ by Damon
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casting int to char using C++ style casting [duplicate]

Even though the precision is lost, yo ...READ MORE

Jun 13, 2022 in C++ by Damon
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How does #include <bits/stdc++.h> work in C++? [duplicate]

#include <bits/stdc++.h> is a precompiled header implementation ...READ MORE

Jun 21, 2022 in C++ by Damon
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Use of min and max functions in C++

The functions fmin and fmax are designed ...READ MORE

Jun 21, 2022 in C++ by Damon
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4,000 views
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Where are the Microsoft Visual C++ 2015-2022 Redistributable (x64) packages installed?

They are, in my opinion, at their best. C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Redist\MSVC It's worth noting ...READ MORE

Jun 15, 2022 in C++ by Damon
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3,777 views
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Why can't the switch statement be applied on strings?

The reason for this is due to ...READ MORE

Jun 28, 2022 in C++ by Damon
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3,617 views
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How to convert string to char array in C++?

Simplest way I can think of doing ...READ MORE

Jun 20, 2022 in C++ by Damon
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2,265 views
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Is there any built-in factorial function in c++?

Although no C function is written particularly for computing factorials, the C math package allows you to compute the gamma function. Because (n) Equals (n-1)!  Using tgamma of i+1 on positive integers returns i!. for (int i = 1 ; ...READ MORE

Aug 2, 2022 in C++ by Damon
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Finding square root without using sqrt function?

I tried to incorporate the technique I had discovered for calculating the square root without utilising the sqrt function into programming.  I finally have this C++ code that runs. #include <iostream> using ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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1,507 views
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how could I use the power function in c/c++ without pow(), functions, or recursion

It is part of a series.  Replace pow() with the previous iteration's value. There is no need for code to call pow ().  Pow(x, 5 * I - 1) and pow(-1, I - 1) may be formed since both have an int exponent dependent on the iterator I from the previous loop iteration. Example: Let f(x, i) = pow(x, 5 * i ...READ MORE

Jun 21, 2022 in C++ by Damon
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1,315 views
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What is the difference between operator overloading and operator overriding in C++?

Some people use the latter word to ...READ MORE

Aug 2, 2022 in C++ by Damon
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1,165 views
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Difference between function overloading and method overloading

They are interchangeable. Some people, on the other hand, prefer calling methods, functions that are part of a class, and functions, free functions. //function overloading void foo(int x); void foo(int x, int ...READ MORE

Jun 21, 2022 in C++ by Damon
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1,141 views
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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
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1,114 views
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How can I terminate an infinite loop in Turbo C?

I get caught in an infinite loop.  How can I break this cycle?  Cntrl-C was attempted, however it had little effect.  I have no idea how to stop it. main() { ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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937 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
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804 views
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How do i apply lower_bound to a range of unsorted vector elements?

What's the point of sorting your array? ...READ MORE

Jun 15, 2022 in C++ by Damon
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699 views
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What is the difference between std::__gcd and std::gcd?

I done some research about this. The ...READ MORE

Jun 10, 2022 in C++ by Damon
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694 views
0 votes
1 answer

What is dynamic initialization of object in c++?

Dynamic initialization occurs when the initialization value is unknown at compile time.  To initialise the variable, it is calculated at runtime. Example, int factorial(int n) { ...READ MORE

Aug 2, 2022 in C++ by Damon
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666 views
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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
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655 views
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1 answer

C++ code file extension? What is the difference between .cc and .cpp [closed]

GNU GCC recognizes all of the following ...READ MORE

Jun 21, 2022 in C++ by Damon
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651 views
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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
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632 views
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How to use vector::push_back()` with a struct?

How do I push a struct back into a vector? struct point { int ...READ MORE

Jul 22, 2022 in C++ by Nicholas
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629 views
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Vector of Vectors to create matrix

Before accessing any elements, you must first set the vector of vectors to the right size.  You may do it this way: // assumes using std::vector for brevity vector<vector<int>> matrix(RR, ...READ MORE

Jun 16, 2022 in C++ by Damon
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614 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
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600 views
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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
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589 views
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Is C++ considered weakly typed? Why?

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

Aug 8, 2022 in C++ by Nicholas
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571 views
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How do I erase an element from std::vector<> by index?

You might perform the following to remove a single element: std::vector<int> vec; vec.push_back(6); vec.push_back(-17); vec.push_back(12); // Deletes the second element (vec[1]) vec.erase(std::next(vec.begin())); Alternatively, to remove many elements at once: // ...READ MORE

Jun 10, 2022 in C++ by Damon
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557 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
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548 views
0 votes
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How to convert an instance of std::string to lower case

#include <algorithm> #include <cctype> #include <string> std::string data = "Abc"; std::transform(data.begin(), ...READ MORE

Aug 2, 2022 in C++ by Damon
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548 views
0 votes
1 answer

Ternary operator, if I avoid writing ' expression 2 ' it works but if I not write 'expression 3 ' it gives an error [duplicate]

6.8 Conditionals with Missing Opponents In a ...READ MORE

Jun 28, 2022 in C++ by Damon
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525 views
0 votes
1 answer

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
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517 views
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1 answer

Easiest way to convert int to string in C++

std::stoi (and variations for each numeric type) ...READ MORE

Jun 15, 2022 in C++ by Damon
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502 views
0 votes
1 answer

Ceil function: how can we implement it ourselves?

You can disassemble the components of an IEEE754 floating point number and put the logic together yourself: #include <cstring> float my_ceil(float f) { ...READ MORE

Jun 13, 2022 in C++ by Damon
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edited Jun 14, 2022 by Hemant 497 views
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C++ string in classes

The std namespace contains the string class. You need change the class to something like this: class Language { public: ...READ MORE

Jun 15, 2022 in C++ by Damon
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How can I get all the unique keys in a multimap

This method worked for me. for( multimap<char,int>::iterator it ...READ MORE

Jun 27, 2022 in C++ by Damon
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438 views
0 votes
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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
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423 views
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How does virtual inheritance solve the "diamond" (multiple inheritance) ambiguity?

You desire: (Achievable with virtual inheritance) ...READ MORE

Jun 10, 2022 in C++ by Damon
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418 views
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C++ Switch Cases

I was taking an online quiz based on the C++ switch statement.  I came across a question, and while I have a good knowledge of how switch statements function, this particular question made no sense to me.  Could you please explain? Why is the answer D and not ...READ MORE

Jul 22, 2022 in C++ by Nicholas
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416 views
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How to initialize an std::string with a length?

How can I correctly initialise a string if its length is specified at build time? #include <string> int length = 3; string word[length]; //invalid ...READ MORE

Jul 27, 2022 in C++ by Nicholas
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411 views
0 votes
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What's the difference between constexpr and const?

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

Aug 5, 2022 in C++ by Damon
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403 views
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Why we actually need runtime polymorphism?

One of the most significant elements of ...READ MORE

Jun 10, 2022 in C++ by Damon
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401 views
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str_lib_facilities.h file from Stroustrup's Programming: Principles and Practice Using C++ generating errors

Switching the compiler to compile in c++11 ...READ MORE

Jun 13, 2022 in C++ by Damon
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395 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
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394 views
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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
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385 views
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Error "Microsoft Visual C++ 14.0 is required (Unable to find vcvarsall.bat)"

For pip, use the binary-only option.  ...READ MORE

Jun 14, 2022 in C++ by Damon
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382 views
0 votes
1 answer

When to use extern in C++

This is useful when dealing with global variables.  Global variables are declared in a header so that any source file that contains the header is aware of them, but you only need to "define" them once in one of your source files. To explain, using extern int x; informs the compiler that an int object named x exists elsewhere.  It is not the compiler's responsibility to know where it exists; it just needs to know the type and name so that it may utilise it.  After compiling all of the source files, the linker will resolve all x references to the one definition found in one of the generated source files. For it to operate, the x variable's declaration must have "external linkage," which simply means that it must be defined outside of a function (at what's known as "the file scope") and without the static keyword. header: #ifndef HEADER_H #define HEADER_H // any source file that ...READ MORE

Jun 21, 2022 in C++ by Damon
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369 views
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Why is Turbo C++ showing this error in DOSBox on my Mac?

Your installation must be defective!  I have a Mac, and I'm typing this on it while using TurboC++.  Consider uninstalling and then reinstalling the programme. Download the package in the same way as you would a.dmg programme from the internet.  (For example, drag and drop the programme into the Applications folder)  Ascertain that your Applications folder is global to your system.  This is what I mean: When in Finder, select the "GO" option from the top menu bar. From the drop down option, choose "Computer." In the newly opened window, click on your hard disc. There is a "Applications" folder there.  That's where you should put TurboC++. Go to Launchpad, and start Turbo C++. ...READ MORE

Jun 28, 2022 in C++ by Damon
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365 views
0 votes
1 answer

Is there an easy way to make a min heap in C++?

Use make heap() and its buddies from algorithm>, or priority queue from queue>.  Make heap and friends are used by priority queue. #include <queue> // functional,iostream,ctime,cstdlib using namespace std; int main(int ...READ MORE

Jun 27, 2022 in C++ by Damon
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343 views
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How do I create an array of pointers?

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

Aug 5, 2022 in C++ by Damon
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341 views
0 votes
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std::greater on a an std::pair of a double and a class

std::greater is simply a wrapper for a ...READ MORE

Jun 2, 2022 in C++ by Damon
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341 views