C++

Forum

General C++ Programming - August 2021 (Page 3)

TFIDF

Here's a link to the documentation of fprintf https://www.cplusplus.com/reference/cstdio/fprintf/ \t is an escape character that means tab whitespace %d is a sp...

[8 replies] Last: to compare a sentence of the user to a text contained in a text file ... (by seeplus)

by Cplusc

preconditioned conjugate gradient solver

I wrote a preconditioned conjugate gradient solver but when calling the function it just gives me zero. any help would be appreciated. int PCG(SparseMatrix& ...

[5 replies] Last: Your code will only ever do one iteration, and it won't change sol() o... (by lastchance)

by Lester702

Reading values from a json file and storing them

I just got started with jsoncpp in my game and I'm using it to store settings and to save the game and I've been able to write to a file, but I haven't been abl...

[2 replies] Last: Did you check if file is open ? std::fstream has "is_open()" function ... (by kbz8)

by mecacool

Fwrite stored file and its data from another file archive issue

Hello, I am trying to write a file, and it's file size from an archive file .afs. This file "0611_bgm.adx" is stored inside this .afs file and I need to w...

[16 replies] Last: opcodes means: in an executable file (.exe, .dll, .scr, things like th... (by jonnin)

by Hawlong

problem in curl .

How install curl in codeblocks Dawnload Link : https://curl.se/windows/

[17 replies] Last: thmm Thanks for reply. Okay i'll try another lib, Thanks so much , (by Hawlong)

by GroovyJack

Help me with these conceptual algorithm questions please

A. Given a graph and assume we computed the minimum weight paths using Dijkstra's algorithm (we maintain a predecessor array), if we add a constant C to all edg...

[6 replies] Last: Low hanging fruits: I is not detailed enough. Its technically fals... (by jonnin)

by keyboard9

HBITMAP outside or CreateCompatibleBitmap inside?

I am using C++11 and Code::Blocks 17.12 and compiling on a 32 bit system. NO Visual Studio. NO .net. I plan to compile this later on a 64 bit system. I have two...

[2 replies] Last: salem c Thank you. Got my answer. Got a short, understandable, dire... (by keyboard9)

by Hawlong

how to convert HANDLE hProcess to Hwnd

how to convert HANDLE hProcess to Hwnd , I want use it in this function SetForegroundWindow(); void killProcess(const char *filename) { HANDLE hSnapSh...

[16 replies] Last: malibor working thanks so much , Ganado thanks for help <3 , seepl... (by Hawlong)

by malibor

Default template arguments

My understanding is default template arguments must be followed by default template arguments, should be not legal, but it compiles jut fine with msvc: templa...

[2 replies] Last: Ah OK, I misread that part, this answers the abbreviated version as we... (by malibor)

by malibor

Why some people use "this->" when there is no need? (1,2,3)

I see some repositories explicitly make use of this->whatever(); for almost every function call within class. But just saying whatever(); is enough because...

[42 replies] Last: regarding comments going out of date because functions grow... It's w... (by malibor)

by wc skya

Why g++ didn't choose move constructor

For this program source code: #include <cstdio> #include <utility> namespace { int ID; struct T { T(): id(++ID) { printf("construct %d\n"...

[3 replies] Last: In the future when posting code a couple of points to read about: PL... (by George P)

by grkanklcsln

for loop gives the same result

I try to generate randlomly sequenced po, p1, p2, p3(three of them are 0 and the other is 1)But the for loop gives 4 same sequence. Can you help? #include <...

[4 replies] Last: Hello grkanklcsln, My apologies. In my hast to head the call of natur... (by Handy Andy)

by Bamboo445

ofstream doesn't work as a class member

I am trying to make my own file handler, but as always when i try to use std, there are problems. The exactly same code does work when the ofstream is local, bu...

[4 replies] Last: Looks like the local variable does execute close() in the destructor,... (by seeplus)

by Wali23

perfectNumber

Can't figure out level-2 to level-4>>> Level 1: Small perfect numbers Begin by writing a program that prints perfect numbers (those with a badness of 0). Separ...

[4 replies] Last: #include <iostream> #include <cmath> #include <cstring> using namespa... (by lastchance)

by grkanklcsln

Randomly generated gaussion distribution array

Hi guys, I am trying to create an array which inludes random gaussion distribution elements with mean = 0, standard deviation = 1 and size= 20. The correspon...

[3 replies] Last: Thanks a lot guys. You save me a lot of trouble. (by grkanklcsln)

by grkanklcsln

Returning more than one value from a function

I want to return multiple values (p0, p1, p2, p3) rather than one. Thank you in advance. int probabilities(int newstate) { int p0, p1, p2, p3; float max...

[8 replies] Last: It's probably Q-learning anyway, in which case I thought the idea was ... (by lastchance)

by zXFlameXz

Ray - Sphere Intersection

Can someone help me get the Ray - Sphere Intersections formula using quadratics? It's for my homework and I'm having problems finding the answers. This is t...

[14 replies] Last: My bad. I thought dot() and the others were part of struct Pt. Doh! (by dhayden)

by gander

smoothen vector<string_view>

I've split my string into vector<string_view> and now I'd like to get back the original string (or a list of substrings if elements were deleted). my question i...

[14 replies] Last: hope you're aware that when giving split() the parameter "false" the... (by seeplus)

by Alex2b2021

How to print a Html file with c++

Hello my name is alex and I'm from France so sorry for possible mistakes. I developed a programm in c++ for a gite de france in order to create contracts eve...

[15 replies] Last: I think the better question here is how OP's employer feels about us... (by Duthomhas)

by Cplusc

scatterv in dot product

I am trying to do a dot product of two vector using mpi. the size of vector is not dividable by the number of processors. let's say the number of element in the...

[7 replies] Last: @lastchance Thanks for this point, "More seriously, when you tried usi... (by Cplusc)

August 2021 Pages: 1 234

Archived months: [jul2021] [sep2021]

This is an archived page. To post a new message, go to the current page.