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General C++ Programming - April 2020 (Page 6)

how to generate Random matrix needed

#include <stdio.h> #include <stdlib.h> #include <omp.h> #include <time.h> double mul_vector_transpose_vector(double* v1, double* v2, int n) { int i; ...

[12 replies] Last: dutch and Ganado,thank you so much for the help,I really appreciate,an... (by Nana12)

by jlivingstonsg

Make a online BlockOut2 with online score database

Hi. I have uploaded the source code of a game from 1989 called BlockOut , that is a 3D Tetris game to a online code editor. https://repl.it/@jlivingstonsg/BL...

[3 replies] Last: Here is the source code. https://sourceforge.net/projects/blockout/ I... (by jlivingstonsg)

by bibo

Errors on operations of datatype map of sets of classes

``` #include <bits/stdc++.h> using namespace std; class State; typedef map<char, set<State>> symbol2States; vector<string> split_string(string); char Eps...

[2 replies] Last: The map.find return a std::pair<char, set<State>> but getTransitionToS... (by thmm)

by kianarahma

need help about math c++

hello, i am currently new in programming. So I made a program to basically calculate 2^n (n user input) #include <iostream> #include <math.h> using namespa...

[1 reply] : Maybe sum += pow(2,i); (by salem c)

by coolguy11

Kruskals Algorithm. NEED HELP URGENT.

Minimum Cost To Connect Cities(Kruskals) You are to write a function that will calculate the minimum to cost to connect a group of cities. The cities will be...

[2 replies] Last: http://www.catb.org/esr/faqs/smart-questions.html#homework and http://... (by salem c)

by Uzi

PIR Motion Sensor with Piezo Buzzer and LEDs

I am trying to program a PIR motion sensor that will sense motion and turn on a piezo buzzer and LED light that are all connected on a Parallax Propeller. The c...

[1 reply] : Please edit your post for readability https://www.cplusplus.com/articl... (by salem c)

by bsmith

Recursion example

I am new to the idea of recursion in functions. For example, I'm building a program, but I want to try changing one of the functions to use recursion (so I can ...

[2 replies] Last: That function is not a good candidate for recursion. You could write a... (by dutch)

by lastchance

Need some help with Runge Kutta in c++

Please: - put your code sample within code tags, so that we can see the structure more easily. - tell us what the input should be; - tell us why you think the o...

[2 replies] Last: Whoever did that is a POS, there was nothing wrong with the OP other t... (by Ganado)

by john Alvarez

Understanding arrays as pointers

Hey, so in class, we learned about understanding arrays as pointers and we used it to print out a chessboard and now I'm trying to do the same on my own and I'm...

[6 replies] Last: You're right. Thank you, my good sire, (by john Alvarez)

by thanhquan1704

I got this problem in the line "my_tree = insert(my_tree, 50)". How can I fix it?

#include <iostream> using namespace std; template <typename T> struct tree_node { T key; tree_node* left = nullptr, *right = nullptr; tree_node(T key) ...

[5 replies] Last: Good day. A lot of people face this problem. In the article: https://l... (by Merch)

by Cjigsaw

New assignment

Hello everyone, I have another assignment and I was wondering if there is a way to have someone help explain what I need to do with this assignment. I had a...

[2 replies] Last: Sure, if you show us the assignment someone might be able to help. (by thmm)

by bheadmaster

extern "C"?

I know of an extern "C" keyword that prevents C++ from name-mangling to ease the interface of C++ code to other languages. However, what I don't unde...

[14 replies] Last: Heh, shows my age. Remember, I was programming Windows back when it wa... (by Duthomhas)

by ChrisValvo

Help using fstream- kinda lost (1,2)

Hello all, i'm trying to create a program using fstream that calculates the sum, and average in the file. I'm kinda lost and can't really ask questions since ...

[24 replies] Last: [quote=ChrisValvo]"volume serial number is 184b-6cd1. Directory of c:\... (by lastchance)

by ammds

knight's tour question

Hello! I have some C++ question with this program. A knight in chess can move to any square on the standard 8x8 chess board from any other square on the boar...

[6 replies] Last: Without traps you could probably solve this analytically. With traps ... (by lastchance)

by chumbucket

Finding Min/Max Value of an Array

Hello everyone, Hope this quarantine has been kind to you all. Please help with the following program... I am trying to find the minimum and maximum valu...

[1 reply] : First, please use code tags. See http://www.cplusplus.com/articles/jEy... (by keskiverto)

by frek

A vector of user-defined type

Hi all, Please consider this example: #include "C:\Users\...\std_lib_facilities.h" using namespace std; class A { public: //Constructor explicit...

[3 replies] Last: [quote=frek]Doesn't my code have appropriate tags now!? Looks like you... (by mbozzi)

by Programtoday

Help: Stack

Hi. I need help pushing the values onto a stack. Once done, the number of elements should be shown on the first line and the value at the top of the stack on th...

[1 reply] : You have already a custom class and ask about loops and input? WHILE... (by keskiverto)

by frek

Cpp functors

Hi all, What does s in Less_than Lt{ "bakur"s}; in the following code mean, please? using namespace std; template<typename T> class Less_than { cons...

[17 replies] Last: (I reported that). And I reported you for abuse of the reporting sys... (by dutch)

by cody728

infix to postfix formatting

So it is correctly converting infix to postfix just in a bad format for example when I put 55+8 it gives +558 instead of +55 8 how can I change this where would...

[5 replies] Last: Yeah, it's a real pain to get past that hurdle. I recently played wit... (by Duthomhas)

by julie2019

MISRA Coding Standard and Static Code Analyzers

If you care about the quality, safety and security of your software, MISRA and static code analysis might be of help. The article tells about what MISRA is, wha...

[no replies]

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