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General C++ Programming - December 2020 (Page 5)

I have built a 20 X 20 neopixel display using 400 WS2812B LEDs. This will be controlled by an Arduino Mega using their version of C++. I have also created a n...

[7 replies] Last: You need to distinguish between texture coordinates and screen coordin... (by mbozzi)

by SirEnder125

When is delete keyword necessary?

[Closed by author]

[13 replies] Last: Yes, helios, very much a recurring pattern. You were just the latest.... (by deleted account xyzzy)

by Buttercup314

C++ Raycaster using SFML

Greetings, I know this isn't exactly C++ related, however, I was just wondering if anyone knew anything about texture mapping onto a raycaster. I'm currently t...

[no replies]

by closed account Lv7SvCM9

C2011 'timespec': 'struct' type redefinition error.

I have the following code and when I try to compiled it I get a C2011 'timespec': 'struct' type redefinition error. Can someone please tell me what is my error,...

[2 replies] Last: Works for me (gcc / Ubuntu). $ gcc main.c -pthread $ ./a.out 1000 Su... (by salem c)

by Rxlr

How to access information on an Object the user will create.

So, I've been struggling with how to do this for a while now. I have this function, which the user uses to let the program know how many Territories he wants t...

[1 reply] : Have you learned about scopes yet? http://www.cplusplus.com/doc/tutori... (by AbstractionAnon)

by marhuum

To release memory of a vla array

How to deallocate and/or release memory of a vla array ?

[1 reply] : There are no variable length arrays in standard C++. We have std::vec... (by JLBorges)

by blaster123

I need help with a two-dimensional table

Its given the matrix T with integer elements. It is considered that the two diagonals i divide the matrix into four areas: north, south, east, west (the eleme...

[9 replies] Last: @seeplus can you explain how you did the first program? (by blaster123)

by Amuiz

Passing an argument into the constructor of an array of objects

class Player{ public: Player(int NumberOfStats){ NumOfStats=NumberOfStats; } private: int NumOfStats; }; int main (){ int x,y; strin...

[3 replies] Last: For example, std::vector<Player> players; players.emplace_back(5); /... (by helios)

by banthong

use a class in multiple others

I'm rewriting some STM32 C code to C++ and stumbled upon an issue. I used to have a delay(x) function, which obviously offered a delay. This was used all over ...

[5 replies] Last: Thank you everyone for all your replies. I guess the most relevant rep... (by banthong)

by junweinehc

Beginner Level Linked List Qs

Codes are included, and I only have specific questions about lines of code below, please kindly help if you know what's going on: Node *link // is this sayin...

[2 replies] Last: Thank you Jonnin. I learned a LOT from you. (by junweinehc)

by project science

Variable doesn't update with Pointer

Hi, I've created a code which calculates simple geometries of shapes, e.g. area, volume. A user is intended to feed in a number (in the main.cpp file). While...

[4 replies] Last: I'm curious now about why your using const. Const correctness is b... (by keskiverto)

by SirEnder125

How to check if one string is the first half of another string? (Visit for explanation)

Hello. I was trying to make a function that checks if a string contains another string and if the other string is the first part of that string. For...

[4 replies] Last: Thank you all. :) (by SirEnder125)

by aymanawa

i got no suitable convertion right her "std::istream_iterator"<std::string>(std::istringstream(nb))

const std::string nb = "eight one six eight three three eight five four two nine six nine"; std::transform(std::istream_iterator<std::string>(std::istringstrea...

[2 replies] Last: thank you mbozzi it works and great reason explanation (by aymanawa)

by sinoyue

Program skipping first line of input when displaying final output?

Hi all! So I have put together my code for an assignment for a C++ class that I am in when I came into a little of a hurdle. So my code takes the input perfe...

[7 replies] Last: For easy compile, I moved the .h contents into the .cpp file OK, but... (by Peter87)

by java982

Can somebody help me with my code please??? Thanks

Hi, I wrote the code for the Classes but can I have some guidance to do the following, please? Write a program that defines a vector of shared pointers to the...

[3 replies] Last: Circle(double xcoord = 0.0, double ycoord = 0.0, float r0 = 0.0) : P... (by seeplus)

by laura11111

+=operator

hello I have the following question: modify the +=operator so it can add an element to the vector of distances the number of stops will also be incremented ...

[7 replies] Last: Decomposition and encapsulation . The operator+= decomposes into t... (by keskiverto)

by Ocko91

calendar

Hello , can someone PLS check my code and tell me how to fix it ? I hope i i formated ift well... dateType.h #ifndef dateType_H #define dateType_H #include <...

[4 replies] Last: Thank you seeplus ! salem c i am using visual basic 2015 on windows ... (by Ocko91)

by laura11111

Help with bool>operator

the question is change the operator overload < it will return true if the total distance of the route represented by the first operand is smaller than the to...

[4 replies] Last: This appears to be related to http://www.cplusplus.com/forum/general/2... (by dhayden)

by liam401

Swapping array elements

Is there a way to swap an element into an array at a specific point. For example i have a string array of {"cat", "dog", "fish"} and i want to swap out "dog" wi...

[3 replies] Last: "swap" as you are using it, you are saying 'replace' which is valid i... (by jonnin)

by laura11111

constructor

hi i had for this exercise to make a copy constructor, a destructor and =operator class TrainRoute { private: string departure; string destination; ...

[2 replies] Last: Assuming that the copy constructor is OK then the operator= can be imp... (by seeplus)

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