Latest questions in C++

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Adding to a vector of pair

I have a pair vector that looks like this: vector<pair<string,double>> revenue; I'd want to add a string and a double from a map that looks like this: revenue[i].first = "string"; revenue[i].second = map[i].second; However, because revenue is not initialised, it returns an out of bounds error.  So I ...READ MORE

Jul 26, 2022 in C++ by Nicholas
 • 7,760 points • 890 views
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C++ - upcasting and downcasting

As an example: Shouldn't the second d.print() call during upcasting print "base"? Isn't it a "d" derived object that has been upcasted to a base class object? And what advantages does downcasting have? Could you describe upcast and downcast in more detail? #include <iostream> using namespace std; class Base { public: ...READ MORE

Jul 26, 2022 in C++ by Nicholas
 • 7,760 points • 1,000 views
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Conversion of base 10 to base 6

I attempted to convert a base 10 number to a base 6 number in C, but my code failed two hidden test cases. I don't see any logical flaws in it. Could you do it? //convert base 10 to base 6 #include<stdio.h> int main() { ...READ MORE

Jul 26, 2022 in C++ by Nicholas
 • 7,760 points • 1,011 views
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What is the difference between a concrete class and an abstract class?

I'm learning C++, but I'm having trouble ...READ MORE

Jul 26, 2022 in C++ by Nicholas
 • 7,760 points • 632 views
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Simple dictionary in C++

Changing some Python code to C++. BASEPAIRS = { "T": "A", "A": "T", ...READ MORE

Jul 26, 2022 in C++ by Nicholas
 • 7,760 points • 805 views
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Why do we use volatile keyword?

I've never used it, but I'm curious ...READ MORE

Jul 25, 2022 in C++ by Nicholas
 • 7,760 points • 605 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 • 722 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 • 715 views
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Which is better way to calculate nCr

Approach 1: C(n,r) = n!/(n-r)!r! Approach 2:  I discovered this in Wilf's book Combinatorial Algorithms: C(n,r) may be represented as C(n-1,r) + C (n-1,r-1). e.g. C(7,4) = C(6,4) + ...READ MORE

Jul 25, 2022 in C++ by Nicholas
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Visual C++ vs Visual C# , which is the best to learn?

I completed my C++ lessons and practises ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 505 views
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const int *p vs. int const *p - Is const after the type acceptable?

My coworker is 0 for 2 on questions inspired by him (1, 2), so I decided to give him a chance to catch up. Our most recent argument is about the placement of "const" on declarations. He believes it should be placed either in front of the type or after the pointer.  The explanation is that this is what everyone else does, and different styles are likely to be confusing.  Thus, a constant pointer to int and a constant pointer to int would be: const int *i; ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 781 views
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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
 • 7,760 points • 517 views
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What is the difference between Java and C++?

What is the difference between Java and ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 498 views
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Default inheritance access specifier

If I have two classes A and ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 602 views
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What are access specifiers? Should I inherit with private, protected or public?

I'm not sure what access modifiers signify ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 585 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
 • 7,760 points • 1,146 views
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XOR Operation Intuition

Except for one, every element in an array of numbers appears twice.  Locate that solitary one. Keep in mind that your algorithm should have a linear runtime complexity.  Could you do that without using any more memory? class Solution { public: int ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 455 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
 • 7,760 points • 1,462 views
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Run C++ in command prompt - Windows

What may be the cause? I know ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 894 views
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Accumulate function in Vector (STL) giving negative sum

I'm receiving a negative total when I run the code below (-294967296). #include<iostream> #include<vector> #include<numeric> using namespace std; int main() { ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 826 views
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Using push_back vs at in a vector in C++

I'm not sure how to use vectors in C++.  It has to do with the vector's push back technique.  I used push back to insert entries into the vector in the first programme.  I used at() to insert entries into the vector in the second application. #include <iostream> #include <vector> #include <string> using namespace std; int main ...READ MORE

Jul 22, 2022 in C++ by Nicholas
 • 7,760 points • 596 views
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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
 • 7,760 points • 824 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
 • 7,760 points • 677 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
 • 7,760 points • 639 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
 • 7,760 points • 673 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
 • 7,760 points • 912 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
 • 7,760 points • 999 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
 • 7,760 points • 512 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
 • 7,760 points • 653 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
 • 7,760 points • 912 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 • 696 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
 • 7,760 points • 478 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
 • 7,760 points • 923 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
 • 7,760 points • 671 views
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1 answer

How can I terminate an infinite loop in Turbo C?

you need a condition to break out ...READ MORE

Jul 14, 2022 in C++ by Damon
 • 4,960 points
edited Mar 5 • 2,707 views
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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
 • 7,760 points • 485 views
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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
 • 7,760 points • 5,034 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
 • 7,760 points • 549 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
 • 7,760 points • 585 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
 • 7,760 points • 467 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
 • 7,760 points • 440 views
0 votes
0 answers

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 • 762 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
 • 7,760 points • 837 views
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what is containership or nesting in C++?

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

Jul 11, 2022 in C++ by Nicholas
 • 7,760 points • 481 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 • 692 views
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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
 • 7,760 points • 657 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
 • 7,760 points • 776 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 • 703 views
0 votes
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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 • 692 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 • 740 views
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