General C++ Programming - C++ Forum

Hi, everyone. I'm working on a hash table program, but while I run it, the windows just ended with "Process exited after 2.92 seconds with return value 32212254...

[18 replies] Last: To deal with hash collisions, you look for an empty slot in the hash t... (by dhayden)

by colt

'std::bad_alloc' when working with strings

Hello I am receiving the above error message when a method returns a string. This is the method that fulfills the string and then return a copy of it: st...

[5 replies] Last: > run your program through use a debugger >> Well, I use GDB. show th... (by ne555)

by piratekingluffy

Why doesn't this build

I get an error argument of this type const char is incompatible with parameter

[8 replies] Last: thanks salem, that fixed it (by piratekingluffy)

by stav

static initialization in header only library?

Hi, I want to write a logging library and so im currently in the process of figuring out how best to go about it. So far im imagining doing something like this:...

[3 replies] Last: Thanks alot guys (by stav)

by frek

Constexpr in C++ (1,2)

Hello all, Is what I know of constexpr written below all correct? Should add something to it, please? - A constexpr symbolic constant must be given a valu...

[36 replies] Last: Thank you very much. I don't think I have another question in this ca... (by frek)

by aceadams

How do I stop ..eof from reading the last line of input twice?

#include <iostream> #include <queue> using namespace std; int main () { int n, num, cust; char type; cin>>n; queue <int> q; vecto...

[7 replies] Last: No, I get its purpose, but it still feels like the sort of thing that ... (by Albatross)

by GillesCplusplus

Adjacency list, array of pointers

Hi guys, can someone explain me why to use a double pointer in the class graph? I really don't understand this line : this->array = new AdjList*[Algorithme::nb...

[2 replies] Last: OP's code, reformatted: #include <cstring> #include <fstream> #includ... (by Albatross)

by dzikiwi

Inheritance question

I have a parent class with 2 child class. I want to use dynamic casting to change my parent class from base to derived so that I can access the data and methods...

[1 reply] : . I want to use dynamic casting to change my parent class from base t... (by Repeater)

by Cambalinho

why the graphics.h and conio.h was losed? (1,2)

why the graphics.h and conio.h( textforecolor(), textbackcolor(), gotoxy() and clear() ) was losed?

[33 replies] Last: That Sams book is an older version of the book I linked. There are so... (by deleted account xyzzy)

by a00

do header files get compiled

I write a program called main.cpp, i know the main.cpp get compiled into object file and get linked. I wonder if header file(for example somethings.h) get co...

[6 replies] Last: Okay, I suppose I'm already doing that. It also occurs to me that the... (by mbozzi)

by ndcn541

can't remove duplicated objects from vector

I thought object 3 and 4 will be erased and this should output 1 and 2, but it gives me 1,2,3,4, why is that? #include <iostream> #include <vector> #include <...

[2 replies] Last: std::unique only removes CONSECUTIVE duplicates. Your nominally equal ... (by lastchance)

by calvinfornia

Hash table with speed required

Hi, everyone! I'm a C++ beginner, and here is a project which is about implementing a hash table to store the patients' data in a hospital. As the attached dat...

[2 replies] Last: as fast as possible means no collisions, don't even detect or handle -... (by jonnin)

by codecaine1

How to write code for this? - Class

Hey all, I’m very new to c++ and trying to learn from doing exercises. I kind of stuck and need help. 1) I have main.cpp, rectangle.h and rectangle.cpp ...

[3 replies] Last: rectangle.h // #include guard: https://en.wikipedia.org/wiki/Include_... (by JLBorges)

by ndcn541

sorting and removing duplicates from vector

Hi, I understand that the code below sorts the vector and remove the duplicates, but can someone tell me what does the unique method return? I know the erase me...

[2 replies] Last: Some variants: #include <iostream> #include <vector> #include <set> #... (by lastchance)

by GillesCplusplus

pointer inside struct

Hi guys, can someone explain me the difference in meaning between struct AdjListNode { int dest; int weight; struct AdjListNode* next; ...

[12 replies] Last: @jlb, that is why I personally NEVER declare more than one variable at... (by deleted account xyzzy)

by akash16

Size of Class/Object

Two queries: 1. why size of Base class object is getting 8 bytes instead of 5 bytes(1 for char + 4 for int)? 2. And size of class is equals to size of object ...

[3 replies] Last: A couple of links for the curious. https://www.kernel.org/doc/Document... (by salem c)

by aceadams

How can I make my solution more efficient?

I'm having trouble with a competitive programming problem, here it is. Farmer John's N cows (1 <= N <= 100,000) are standing at various positions along a long ...

[11 replies] Last: So, you're saying zero holds a special value, but is that value suppos... (by Niccolo)

by ndcn541

Assigning part of a 2d array to a new 2d array

I am trying to do this, but it is giving me "initializer fails to determine size of ‘b’" int main() { int a ; a = 1; a = 1; ...

[7 replies] Last: @ fewdiefie You forgot that a is a 2D array, so a is the address... (by Duthomhas)

by fewdiefie

FPS game programming

Hello, I have spent the last 2 years learning the DirectX 11 technology to build my own FPS video game, I can write a fully functional rendering system and a ba...

[7 replies] Last: yea. I did physics sim / flight sim, just sans graphics (or on one or... (by jonnin)

by abcdef123

Using nested if for evaluation of signum function

The function to be evaluated via C++ code is: Y = 0 if x = 0; Y = 1 if x > 0 Y = -1 if x<0 The value of x is input from the user. "Nested if" statements are t...

[14 replies] Last: but, lastchance's answer is probably the best way to actually code it ... (by jonnin)

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General C++ Programming - August 2019 (Page 3)