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General C++ Programming - December 2020 (Page 2)

For the following function, N in "n=" line has 3 values when executed N=[0, 0, 586218.1824]. When I break it down to C = (N.at<double>(2))the 586218.1824 h...

[4 replies] Last: This worked great, below, thank you: ... std::cout << "std::setprec... (by technologist)

by BBrandon

Sorting coordinates stored in 2d array

Hello! I've been recently working on graph problems and problems with coordinates, and I found that if I knew how to create a specific function, it would be qui...

[4 replies] Last: > Now this means that if I ever need the Nth coordinate, > I could ea... (by JLBorges)

by Mircea1990

Function for returning total weigth of a train

How can I override a function to return the total weigth of a train?? class TrainRoute { .... int totalWeight() { return 100; } } class FreightTrainRou...

[1 reply] : To override a function, you have to declare it virtual in the base c... (by AbstractionAnon)

by BBrandon

Algorithmic Truck Problem

Hello! I've been working on programming problems involving graphs, and I found an interesting one I just couldn't get an efficient program for. So the problem g...

[3 replies] Last: I think I should have mentioned, if both trucks reach an intersection,... (by BBrandon)

by Dorothy21548

Finding an optimal solution to a system of linear equations in c++

Here's the problem: I am currently trying to create a control system which is required to find a solution to a series of complex linear equations without a u...

[3 replies] Last: when I did controls algorithms, it was often, but not always, the case... (by jonnin)

by Fumagalli

How to define a non blocking input in C++

0 I'm making a multithread application in C++. In particular, a secondary thread is involved in input operations, the problem is that std::cin is a blocking i...

[1 reply] : Standard streams are inherently blocking. If you need non-blocking con... (by helios)

by Yazz398

having a few problems with my code - output

Hey all im trying to get my code to work but I get a few errors in the int main Anyone able to help me? I believe the root of the problem is in line 150 but I ...

[2 replies] Last: As you are using fixed size record file binary read/write for the clas... (by seeplus)

by keskiverto

Almost done random number generator. Help please

The OP post has been deleted. Quoted here: [quote=olorin82]Hi I can make the program generate random numbers but still it should the following: Create a lott...

[8 replies] Last: Seeplus, your code runs well on my 64 bit g++ --version 8.1.0 (mingw)... (by oggin)

by Feit

How to find the index of a randomly selected element of an array in C++ (1,2)

Hi all, I am new in C++ programming. I need to randomly choose an element from an array and then find out the index of that chosen element. I coded it in M...

[24 replies] Last: @Feit - done! (by seeplus)

by SirEnder125

Question about reinterpret_cast usage

Hello. I recently was wanting to std::cout a hex value to the console but it kept evaluating the hex to decimal (Understandable). So, I remembered not knowing...

[1 reply] : If you want hex, do this std::cout << std::hex << std::showbase << 0... (by salem c)

by SirEnder125

How can I read file at certain path?

[Closed by author]

[6 replies] Last: Well, I am not actually making anything for windows. I am making a 3ds... (by SirEnder125)

by Jstar1990

C++ Program to display Information about Medical personal

Having a difficult time writing a code to display the information on medical personal, this is what i have so far. ]#pragma once #include<string> using n...

[13 replies] Last: So fix it. You declared a bunch of functions but failed to implement t... (by jlb)

by L10nelMessi

Djikstra Algo Ouput Problem

Hi, I am currently doing a project on Graphs and its almost complete. Whenever i enter a char other than A it gives me errors. I still can't figure out what ca...

[1 reply] : You can simplify some of the code: void printPath(int parent , int ... (by seeplus)

by gedamial

tellg() and get()

I have written a simple algorithm to read a text file backwards: int main() { ifstream file("myfile.txt"); if(!file.is_open()) { cerr <<...

[2 replies] Last: get() reads and moves the file position This is exactly what I want... (by gedamial)

by JeanzZ

New to c++ problem with small bit of code im working on

Trying to get this code to work but having no luck.Thank if anyone can show what i need to do. #include <string> #include <iostream> #include <vector> #includ...

[2 replies] Last: This will now compile, read the data file and display it's contents: ... (by seeplus)

by closed account j3wpz8AR

Help with Using string class member functions please

Hi here's my task an below is most of the code already done. Thanks for any guidance: Develop the program further so that it finds and extracts specified i...

[2 replies] Last: .find() returns the position of the beginning of the found string. Co... (by seeplus)

by closed account j3wpz8AR

How to Implement classes?

Hi can you guide me on how to implement member functions of LimitedCounter, OverflowCounter and UseCounter in my code below? Here's the task: Derive a cl...

[2 replies] Last: It worked perfect. Thanks! (by closed account j3wpz8AR)

by nanay001

Meaning of Arguments in Main Function

Hi, I have a question about a main function with the following arguments: int main(int argc, char *argv ) Let's say the above line comes from a source...

[2 replies] Last: https://www.gnu.org/software/libc/manual/html_node/Program-Arguments.h... (by keskiverto)

by ArturNoubel

[BCC32 Error] pFIBScript.hpp(61): E2040 Declaration terminated incorrectly

Hi, I inherited a project in RadStudio 2007, which uses FIBScript version 1.8b2. Compiled FIBScript all files to work in C ++, everything is fine. I'm starting...

[1 reply] : show the code around line 61 of the offending file. its likely a ; p... (by jonnin)

by JUANDENT

const char[3] does not generate template parameter of char[3]!

The code: template<typename T1, typename T2> struct Pair1 { T1 first; T2 second; Pair1(const T1& x, const T2& y) : first{ x }, second{ y } {} }...

[8 replies] Last: ok so the compiler is not giving very clear diagnostics! Thanks @Cubbi... (by JUANDENT)

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