C++ Questions | Edureka Community

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How to use new[ ] and delete[ ] operator in C++

int main(){ char *str; ...READ MORE

Jun 20, 2022 in C++ by Damon
• 4,960 points • 888 views

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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
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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 • 884 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 • 881 views

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C++ override inherited methods

Child::init is now concealing Father::init and not overriding it. In order to receive dynamic dispatch, your init member function must be virtual: virtual void init () { ...READ MORE

Jun 20, 2022 in C++ by Damon
• 4,960 points • 880 views

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(->) 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 • 879 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 • 877 views

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C++ binary operator overloading

The language defines several fundamental types, such as int and double. Objects are instances of fundamental kinds. Let's pretend you have: struct Foo { ... }; You can use non-member functions to overload the operator+ function. Foo operator+(Foo , ...READ MORE

Jun 21, 2022 in C++ by Damon
• 4,960 points • 875 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 • 875 views

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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 • 872 views

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Is there a default return value of C++ functions?

I'm amazed that a file with the ...READ MORE

Jul 25, 2022 in C++ by Nicholas
• 7,760 points • 869 views

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What is meant with "const" at end of function declaration?

I received a book in which it is written: class Foo { public: int ...READ MORE

Jul 28, 2022 in C++ by Nicholas
• 7,760 points • 867 views

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Check if a string contains a string in C++

I've got a std::string variable. I'd want ...READ MORE

Jul 28, 2022 in C++ by Nicholas
• 7,760 points • 867 views

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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 • 866 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 • 864 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 • 864 views

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What is the meaning of "generic programming" in c++?

What does generic programming in C++ mean? I'm ...READ MORE

Jul 11, 2022 in C++ by Nicholas
• 7,760 points • 864 views

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How to implement 2D vector array?

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

Jun 1, 2022 in C++ by Nicholas
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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 • 862 views

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C++ - Decimal to binary converting

The.to string() function of std::bitset returns a std::string containing a binary text representation with leading-zero padding. Use std::bitset32> to get 32-character strings from 32-bit integers, or std::bitset32> to get 32-character strings from 32-bit integers. #include <iostream> #include <bitset> int main() { ...READ MORE

Jun 10, 2022 in C++ by Damon
• 4,960 points • 862 views

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What does "#include <iostream>" do?

You must include it in order to read or write to the standard input/output streams. int main( int argc, char * argv[] ...READ MORE

Jun 28, 2022 in C++ by Damon
• 4,960 points • 861 views

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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 • 857 views

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How to concatenate two strings in C++?

I have a private class variable char ...READ MORE

Jul 25, 2022 in C++ by Nicholas
• 7,760 points • 853 views

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Binary literals?

Binary literals will be supported in ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 853 views

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Using :: (scope resolution operator) in C++

You're mostly correct regarding cout and cin. ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 848 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 • 842 views

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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 • 841 views

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How to convert a char array to a string?

Converting a C++ string to a char ...READ MORE

Jul 14, 2022 in C++ by Nicholas
• 7,760 points • 840 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 • 837 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 • 836 views

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How to declare an array of strings in C++?

I am trying to iterate over all ...READ MORE

Jul 26, 2022 in C++ by Nicholas
• 7,760 points • 836 views

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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 • 834 views

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What is a Class and Object in C++?

A Class is like a blueprint, an ...READ MORE

Jun 21, 2022 in C++ by Damon
• 4,960 points • 831 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 • 828 views

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In C++, what is a virtual base class?

When employing multiple inheritance, virtual base classes are used to prevent several "instances" of a particular class from appearing in an inheritance hierarchy. Consider the following example: class A { public: void Foo() {} ...READ MORE

Jun 10, 2022 in C++ by Damon
• 4,960 points • 828 views

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C++ string input

To read from cin, use a std::string. Then you don't have to guess how big your buffer should be. std::string input; cin >> input; cout << intput; If you ...READ MORE

Jul 11, 2022 in C++ by Damon
• 4,960 points • 827 views

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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 • 825 views

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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 • 822 views

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Understanding c++ Code: Tower of Hanoi using Recursion

I'm studying about recursion in C++, but the following C++ code used to solve the Tower of Hanoi issue has me baffled. void Hanoi(int m, string start, string middle, ...READ MORE

Jul 26, 2022 in C++ by Nicholas
• 7,760 points • 820 views

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Check if a string is palindrome

I need to write a software that ...READ MORE

Jul 11, 2022 in C++ by Nicholas
• 7,760 points • 820 views

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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 • 816 views

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What does the explicit keyword mean?

To resolve the parameters to a function, the compiler is permitted to do one implicit conversion. This implies that the compiler can utilise constructors with a single argument to convert from one type to another to find the correct type for a parameter. Here's an example class with a constructor ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 816 views

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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 • 813 views

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Program to calculate square root c++

Making a C++ application to determine a number's square root. The built-in arithmetic operator "sqrt" is not used in this application. There are two variables: one for the user-inputted integer and the other for the number's square root. This software does not function very well, and I am certain that there is a more effective method to accomplish it: Here is my full code: #include <iostream> using namespace ...READ MORE

Jul 11, 2022 in C++ by Nicholas
• 7,760 points • 812 views

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Use of multisets in C++ [duplicate]

Because a multi-set does not need the storage of single-element objects. You're considering storing anything in a multi-set, such as a string. But it is not its intended use. You may use whatever struct you want and compare it to a single element in the struct. As an example: struct PhoneBookEntry { std::string name; ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 811 views

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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