Trending questions in C++

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How member functions are implemented in C++?

I read somewhere that member functions in C++ are similar to regular functions but with an additional implicit this parameter. As a result, I assumed that this software would be unable to discriminate between two functions.  However, the software executed successfully.  So, was the above statement incorrect? #include <iostream> class MyCls { ...READ MORE

Jul 22, 2022 in C++ by Nicholas
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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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How to find if a given key exists in a C++ std::map

I'm trying to check if a given ...READ MORE

Jul 14, 2022 in C++ by Nicholas
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324 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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What is the fastest way to transpose a matrix in C++?

I have a reasonably large matrix that I need to transpose.  Assume, for example, that my matrix is a b c d e f g h ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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240 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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Successor of INT_MAX and INT_MIN

I have two inquiries. Is 1e9 smaller than ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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188 views
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Converting Binary to Decimal built-in function

In C++, I need to do a ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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182 views
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How do I declare a 2d array in C++ using new?

How do I declare a two-dimensional array using new? For example, for a "typical" array, I would:      int* ary = new int[Size] but int** ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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178 views
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dynamic_cast and static_cast in C++

 I'm perplexed by the dynamic cast keyword in C++. struct A { virtual ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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166 views
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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
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314 views
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1 answer

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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Simple example of threading in C++

Could someone maybe provide a basic C++ ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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129 views
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not able to run graphics in DEV C++

Unable to run the graphics from following ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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126 views
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Using "super" in C++

The following phrase is part of my coding approach: class Derived : public Base { ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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200 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
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142 views
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How to create a dynamic array of integers

How can I use the new keyword ...READ MORE

Jul 15, 2022 in C++ by Nicholas
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109 views
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What is the difference between public, private, and protected inheritance in C++?

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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290 views
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C++ vector erase function not working properly

Here is the code I want to use to delete any entries with values more than 2 and fewer than 5. vector<int> myvector{3, 3, 3, 3, 3, 3, ...READ MORE

Jul 11, 2022 in C++ by Nicholas
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249 views
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What is object slicing?

What is object slicing in C++ and ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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136 views
0 votes
1 answer

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
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249 views
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What's the Use of '\r' escape sequence?

I have C code like this: #include<stdio.h> int main() { ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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97 views
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Purpose of Unions in C and C++

I had previously utilised unions with ease; however, I was startled when I read this post and discovered that this code union ARGB { uint32_t colour; ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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81 views
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throwing a run time error

I just started Programming: Principles and Practice Using C++ because I'm new to programming.  Errors and how to handle them are covered in one of the chapters. What I'm attempting to implement is this little line of code.  The programme will end with a system error message and the text we gave as a parameter, according to the book's description of error(). #include <iostream> #include <string> using namespace std; int area (int ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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92 views
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Why aren't cmath's pow and sqrt templates?

I'm curious as to why std::sqrt and ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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92 views
0 votes
0 answers

Do you use Qt and why do you use it?

Cons and advantages? How long does it ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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83 views
0 votes
0 answers

Purpose of Unions in C and C++

I had previously used unions with ease, but when I read this post and learned that this code union ARGB { uint32_t colour; ...READ MORE

Jul 13, 2022 in C++ by Nicholas
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79 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
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145 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
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126 views
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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
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121 views
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how the iterator in c++ could be printed?

Suppose, I have declared a vector in C++ like ...READ MORE

Jul 11, 2022 in C++ by Nicholas
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120 views
0 votes
1 answer

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
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164 views
0 votes
0 answers

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
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113 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
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100 views
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0 answers

What are the differences between a pointer variable and a reference variable?

What distinguishes a reference variable from a ...READ MORE

Jul 11, 2022 in C++ by Nicholas
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98 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
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95 views
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0 answers

what is containership or nesting in C++?

According to what I believed, a class ...READ MORE

Jul 11, 2022 in C++ by Nicholas
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81 views
0 votes
0 answers

Check if a string is palindrome

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

Jul 11, 2022 in C++ by Nicholas
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71 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
+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
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264 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
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103 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
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101 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
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240 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
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89 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
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175 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
75 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
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214 views
0 votes
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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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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
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122 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
115 views