Beginners - C++ Forum

Welcome to the beginner's forum in C++.com! In this forum, users can to talk about any topic related to C++ for non-expert audiences. Feel free to participate...

[2 replies] Last: How To Answer Questions in a Helpful Way Be gentle. Problem-relat... (by admin)

by Zolaboony

Console Closing Down (1,2,3,4,5,6,7)

Hi, i am new to C++ and have just written my "Hello World" program. It worked all right but the console/cmd closes down instantly. If you tell me why it is clos...

[120 replies] Last: It displayed "Hello world" after you pressed Enter. int c is a ... (by Duthomhas)

by Shervan360

Are these ternary operators the same?

Hello, What are the differences between these? #include <iostream> int main() { int a = 18, b = 44, total = 0, total2 = 0; total +=...

[7 replies] Last: The simplest for even I can come up with is to bit inverse and then te... (by seeplus)

by Dazzer

How to start with audio plugin GUI design?

Hi folks, I'm interested in learning C++ for audio plugin design, but I'm a bit unusual in that i'm not really interested in the audio DSP part, i'm only rea...

[1 reply] : we used to call it RAD (rapid application development) and I am not su... (by jonnin)

by the other jorge

How to get program to distribute input by alternating between two, multi-line string inputs

Hello I need to get this output: 1) type a: 1a type b: 1b 2) type a: 2a type b: 2b 3) type a: 3a type b: 3b 4) type a: 4a ty...

[5 replies] Last: You can do it with just 1 loop to read the data. Consider: #include... (by seeplus)

by CodeChaser

zero dynamic memory allocation

So today I was reviewing teacher code that lets student input the number of blocks of memory to allocate, but the student can input zero. It seems to allocate t...

[4 replies] Last: Well it was written by a teacher. I need say no more..... (by seeplus)

by Hasa2019

Why its showing wrong ?

Hi there, I am trying to run a code what school going student can do ! But not sure what kind of mistake I am doing. Take a look the program #include<s...

[6 replies] Last: Just because you can doesn't mean you should. :) do-while without... (by seeplus)

by ElusiveTau

Lambda Expression: Specifying "this" in the capture clause

I'm reading an article on how to use lambda expressions and have some questions: 1. What is meant by "Only variables that are mentioned in the lambda body a...

[6 replies] Last: @Peter87, I am cognizant of the how and why of the differences in lamb... (by deleted account xyzzy)

by Cyclone

Specifying a file address?

Hi, I am getting an error when trying to specify a file path for my program. It says "failed to open file for writing". I searched around google but couldn't f...

[8 replies] Last: seeplus already mentioned about the <format> library in C++20, a maj... (by deleted account xyzzy)

by zzzhhh

Why const literal class is not a constexpr even if initialized from a constexpr?

class test{ public: constexpr test(){} constexpr int operator+(const test& rhs) const { return 1+rhs.x ; } int x = 10 ; }; cons...

[4 replies] Last: Good point. I suppose you could remove x. I'm not sure what the point ... (by DizzyDon)

by Cyclone

Unhandled Exception: System.AccessViolationException: Attempted to read or write protected memory. This is... (1,2)

Hi, I am getting an error when I run my program. the error is... Unhandled Exception: System.AccessViolationException: Attempted to read or write prote...

[26 replies] Last: you can choose to hunt down some of the offending memory hogs and mov... (by seeplus)

by Cyclone

Bit set function not working correctly?

Good day, I don't know how to ask this as I don't totally understand things but I'm having an issue. My program reads tiles and tile sets from a game. The...

[12 replies] Last: [quote=Cyclone]My code is messy and had left over variables from testi... (by TheIdeasMan)

by Jonathan100

Git problem

Hi. I am trying to get out a confused git situation. I can't really remember how I got there, but I want to get out and manage to add, commit and push like bef...

[7 replies] Last: Thanks for the replays I kind of solved the issue (by Jonathan100)

by Mif

C programming. Using uninitialized memory warning.

I keep getting this warning even I initialize the memory, then I double-check the code paths to ensure no element in allNodes or closedSet is accessed before al...

[17 replies] Last: I found a lot of info and a few C implementations for the A* Search al... (by deleted account xyzzy)

by cgm2k7

Reading files with fread() in chunks.

Good morning everyone! I would like to ask for a little help here on the forum. It's like this. I have a binary file of (9175867 bytes), I need to read only (...

[18 replies] Last: Just wait for when you have EVERY post reported, including ones that p... (by deleted account xyzzy)

by demhat

function declaration with MACROs

hi guys as I know function declarations are like this: void ClearBackground(Color color); however sometimes I can face some kind of function decl...

[7 replies] Last: And, for one question within the OP: Yes, there can be more than just ... (by keskiverto)

by PhysicsIsFun

MPI runtime weird example

Hi guys, I have a weird mpi example where I don't understand the used runtimes. #include <iostream> #include <mpi.h> #include <chrono> #include <cmath> void...

[1 reply] : its hard to know what is really going on with caches, other processes,... (by jonnin)

by zzzhhh

Why do I have to surround parentheses in this fold expression?

template<typename... Args> void printVariadic(Args... args) { (... , (std::cout << args << ' ')); } printVariadic(1, 2, 3, 4); This code can compile and p...

[1 reply] : Because the standard defines a unary left fold expression as: ( ...... (by Peter87)

by salem c

need some help

That seems pretty close to being right, why don't you post the whole program? In case anyone stumbles on this nonsense, the original post / author got sh-canne...

[11 replies] Last: George, I would avoid directly hyperlinking the profile, if you don't ... (by Ganado)

by colt

Simple tga writer not working correctly.

Hi. I did write code to write a simple tga file format file. Unfortunately, it does not seem to work as expected. The resulting image is always black, not ma...

[3 replies] Last: You might consider finding an already existing 3rd party library and u... (by deleted account xyzzy)