C++ Questions | Edureka Community

To begin answering that question, let me characterise member accessors in my own terms. If you already know this, proceed to the section "next:". I'm aware of three types of accessors: public, protected, and private. Let: class Base { public: ...READ MORE

Jul 11, 2022 in C++ by Damon
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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 • 733 views

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Sorting vector elements in descending order

Because of the goto reset instruction, I believe your sort function has entered an infinite loop. If you wish to construct a basic bubble-sort algorithm, follow these steps: #include <iostream> #include <utility> #include <vector> void bubble_sort(std::vector<int>& v) { ...READ MORE

Jul 11, 2022 in C++ by Damon
• 4,960 points • 1,224 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 • 717 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
• 7,760 points • 1,627 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 • 726 views

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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 • 611 views

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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 • 479 views

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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 • 557 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
• 7,760 points • 2,615 views

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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 • 972 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
• 7,760 points • 1,356 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 • 752 views

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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 • 590 views

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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 • 994 views

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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 • 1,030 views

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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 • 686 views

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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 • 489 views

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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 • 617 views

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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 • 786 views

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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 • 644 views

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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 • 466 views

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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 • 799 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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How does the modulus operator function?

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

Jun 29, 2022 in C++ by Nicholas
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edited Mar 4 • 58 views

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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
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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 • 701 views

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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 • 1,333 views

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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 • 649 views

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What is the STL?

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

Jun 29, 2022 in C++ by Damon
• 4,960 points • 549 views

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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 • 593 views

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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 • 448 views

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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
• 4,960 points • 1,789 views

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1 answer

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
• 4,960 points • 1,422 views

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1 answer

*this vs this in C++

This is a pointer, and *this is a pointer that has been dereferenced. If you had a function that returned this, it would be a pointer to the current object, but a function that returned *this would be a "clone" of the current object, created on the stack unless you defined the method's return type to be a reference. A small application that demonstrates the difference between working with copies and working with references: #include <iostream> class Foo { public: ...READ MORE

Jun 28, 2022 in C++ by Damon
• 4,960 points • 972 views

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1 answer

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
• 4,960 points • 9,668 views

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1 answer

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 • 742 views

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1 answer

Is 'If Else' statement indentation important or not in C++? [duplicate]

White space has no effect on the understanding of code in C and C++. That is not to say that the programmer should be unconcerned about its misuse. The easiest method to demonstrate what the above code truly represents is to specify all of the inferred braces directly, as seen below. The 'if then' or 'otherwise' clause only affects one line of code in the if statement with no brackets. This is one of the reasons why people strive to insist on 'proper coding standards' to guarantee that other people can clearly grasp the programmer's flow and meaning. while(c != cols) { ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 742 views

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1 answer

please help me with max_element function in c++ stl

You can substitute max for *max eleme ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 1,005 views

0 votes

1 answer

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 • 653 views

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1 answer

The static keyword and its various uses in C++

Static variables exist during the "lifetime" of the translation unit in which they are declared, and: It cannot be accessible from any other translation unit if it is in a namespace scope (i.e. outside of functions and classes). This is referred to as "internal linking" or "static storage lifetime." (Except for constexpr, do not do this in headers; otherwise, you would wind up with a different variable in each translation unit, which is really confusing.) If it is a variable in a function, it, like any other local variable, cannot be accessed from outside the function. (This is the mentioned local) Class members have no limited scope owing to static, but they may be referenced from both the class and an instance (like std::string::npos). locations as code: static std::string namespaceScope = "Hello"; void ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 727 views

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1 answer

How do I reverse a C++ vector?

The algorithm header has a method std::reverse for this purpose. #include <vector> #include <algorithm> int main() { std::vector<int> ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 943 views

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1 answer

Initializing a two dimensional std::vector

Assume you wish to start a 2D vector, m*n, with a value of 0. We could do it. #include<iostream> int main(){ int ...READ MORE

Jun 27, 2022 in C++ by Damon
• 4,960 points • 692 views

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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
• 4,960 points • 1,324 views

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1 answer

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 • 674 views

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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