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General C++ Programming - July 2017 (Page 4)

Hi everyone. I am working currently with two 8-Bit 74HC164D Shift Registers that are driving 2x4 7segment displays connected together. However, i have an issue,...

[1 reply] : Anyone please? (by RytisBe)

by cmisip

Pointer assignment question

I am missing something here. Why can't I assign the address of a pointer to another pointer. Assign the dereferenced values work but not assigning pointer to...

[11 replies] Last: Thanks for everyone's time and attention, Chris (by cmisip)

by cmisip

Trying to understand std::find and std::equal_range

I am trying to see which Points are close ( within 5 pixels in both the x and y dimensions) to a specific point in a vector of points. I am getting different ...

[4 replies] Last: I am still working on other parts of the code and have not gotten to i... (by cmisip)

by cmisip

Narrowing conversion of

What does this mean ? ^ /home/cmisip/NetBeansProjects/ZoneMinder/src/zm_ffmpeg_camera.cpp:231:54: warning: narrowing conversion of ‘(((int)mv->AVMotio...

[10 replies] Last: I am doing a large number of copies in a loop but it was necessary to ... (by cmisip)

by cmisip

std::vector and mmapped memory with two processes

I am working on a project where (If I understand correctly ), two separate processes are communicating via mmap memory. One process, the capture daemon saves a...

[5 replies] Last: I am marking this as solved. Solution to vector copy into another mem... (by cmisip)

by cmisip

const_cast question

In the following code, does the constness of myint a get preserved? #include <cstdlib> #include <iostream> struct myint{ int x; myint(int ix):x(ix){}...

[7 replies] Last: The const_cast solution does not seem to have any untoward side effect... (by cmisip)

by piratekingluffy

count and list a divisible number in array

double post

[no replies]

by technologist

character array printing junk

What am I doing wrong? I thought in both cases some elements of "Phrase" would be printed back, but not so. Trying to dereference the element, but get unwanted ...

[6 replies] Last: some other memory location that has unknown bytes. You can grab a poi... (by jonnin)

by CosminPerRam

C++ file explorer

Hello fellas, i wanna do something like an cmd file explorer in C++, the scope is to open directoryes and run files, nothing else for now, but i managed to do i...

[7 replies] Last: @doug4 @dhayden Oops, i didnt know that shortening may cause such a pr... (by CosminPerRam)

by gedamial

'std::string': illegal type for non-type template parameter

The code I'm trying to compile is this template<typename T, T default_value = T{}> struct Vec { }; This code is taken from Bjarne Stroustrup...

[7 replies] Last: I don't have those examples in my book, check my screenshot of page 72... (by gedamial)

by technologist

#define GLEW_STATIC

I successfully deployed this preprocessor directive in Eclipse compiler options (-D) as I was looking for a solution to a problem that the -D has fortunately fi...

[2 replies] Last: Thx!! (by technologist)

by heraclies

understanding recursion

Can someone give me a comprehensive line by line explanation of how this code works? It's a backtracking algorithm and I know that it does work, but I'm trying ...

[12 replies] Last: Here's how recursion works: it adds stackframe over stackframe until i... (by Golden Lizard)

by gedamial

When to use "typename" in a using declaration?

Hello. I was looking at the implementation of the std::conditional here >> http://en.cppreference.com/w/cpp/types/conditional I ended up making my own ver...

[7 replies] Last: > Am I correct? Yes. Without the disambiguators, T::MyType would ... (by JLBorges)

by aurimas13

How to run a c++ program from a command prompt

Hello, I would like to know how to run a c++ program with .cpp extension from command prompt? I know there is a way to run by writing c++ program.cpp -o progra...

[10 replies] Last: Thanks jonnin! (by aurimas13)

by aurimas13

Question about floats

Hey, I am interested to know how I could get numbers to be equal to two significant digits after a point like 1.00, 0.50, 0.33, 0.25, 0.20 0.17 when dividing 1 ...

[6 replies] Last: JLBorges thanks! I figured the rest out! (by aurimas13)

by heraclies

problems with sudoku solver function

Can someone please help me to know how I can fix my code to be able to solve a sudoku board. I know it's long but I really need the help. I suspect the problem ...

[1 reply] : 1) Please use code tags when posting code, to make it readable: http... (by MikeyBoy)

by aurimas13

Graphics interface question

Hi, I want to run graphics interface on C++ compiler run by Xcode on my mac, but get the error message: 'graphics.h' file not found. Same for 'conio.h'. Where's...

[3 replies] Last: I might have been wrong about graphics.h. I don't even know if the mac... (by Peter87)

by landlord2017

Please recommend me an advanced level C++ book

I am currently reading "C++ for concurrency". Now I am looking for next one. I want a book can focus on updates on C++11, C++14 and some advanced topic like da...

[5 replies] Last: OP: as you delve deeper into CPP, as the nature of your query suggests... (by gunnerfunner)

by aurimas13

Drawing a line with ncurses

Hello, I would like to know how to draw a line or lines in my multiplication table with ncurses? The code is below. #include <iostream> #include <curses.h>...

[no replies]

by goldenchicken

Crash when assigning value to LinkedList node

I'm trying to make my own LinkedList class, but when I try to make a node in my main function and assign it a value, my program crashes. //LinkedList.h #if...

[2 replies] Last: Thanks Peter87 for the fast reply on why my program crashes! Now I und... (by goldenchicken)

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