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General C++ Programming - July 2019 (Page 3)

by adam2016

Hi guys, So I know/understand the basic premise behind call backs a function will take a function pointer as it's argument, and when a particular event happens...

[1 reply] : so basically how does this happen? is multi threading used?? obviousl... (by Niccolo)

by adam2016

How are operating systems written in C

Hi guys, A concept that baffles me and it may take a book to explain in detail but if you could sum it up that would be awesome, so it amazes me that operatin...

[5 replies] Last: @adam2016, The history of C is informative here. It is intimately ti... (by Niccolo)

by vpi764

Histogram

a program to create a histogram H of 0 ≤ N ≤ 16 entries. A histogram is a set of values and the associated frequencies of each of those values. For example...

[3 replies] Last: @Duthomhas, Firstly, presumably the OP should show some actual work. ... (by dutch)

by lovelysidhu

Oregon trail - classes

I have been trying to make a Oregon trail game and need some help on reading/writing files to read milestone names and distances. These are the pieces of what I...

[no replies]

by philip92

Getting an error while passing an array through a function

I have written an algorithm for 0-1 Knapsack Algorithm. I created an array based on the function inputs but I was getting an error "Expression must have a const...

[3 replies] Last: Strictly, it's a "vector of vectors", or a "sequence of rows". To all ... (by lastchance)

by quadbit

Static member is accessible to class object.

The below mentioned code looks strange to me. template <long I> struct Fibo { static const long value = Fibo<I - 1>::value + Fibo<I - 2>::value; }; te...

[3 replies] Last: I was under the impression that static members can't be accessed via ... (by MikeyBoy)

by MrSY

threads

hey i want to use threads to run 2 actions at the same time. so i tried the way i was able to see on sites, but after compiling my gui pops up and closing ag...

[4 replies] Last: Something along these lines, perhaps: #include <iostream> #include <... (by JLBorges)

by An Integer

Tile collision control with SDL2 (1,2)

So I am building a game with SDL and in need of some help. I've built a tilemap that's a 2D array and a draw function that draws the map with simple sprites. E....

[20 replies] Last: Ok so my bad, usually it's better to use sprites with the same size, b... (by Zaap)

by rjphares

Lamda

How do I make a lamda program print just the output? #include <iostream> int main() { (){std::cout << "hello world" << std::endl;} return 0; }

[1 reply] : #include <iostream> int main() { // anonymous lambda taking no a... (by JLBorges)

by cary333

3d array

Here is the initialization for 3d array, i.e. n*n*5, the last dimension is 5, n could be any integer. typedef double vector5 ; double (**a) = new vector5 ...

[6 replies] Last: Thanks all. Your replies help a lot. I am used to vector as my multi-d... (by cary333)

by Odglog

How to end a thread?

Hi I'm working on a text based game engine, because I have to run number of things at the same time I use threads. From my little understanding of threads I kno...

[6 replies] Last: First thing first thanks for the responds. It turned out I was stupid ... (by Odglog)

by adam2016

need advice

Hi guys, so I've been programming on and off for about 3 years now or maybe a little longer, but to be honest I've never made anything I can reflect on and say...

[4 replies] Last: @Niccolo That's fascinating, you really do have a lifetime of experien... (by adam2016)

by JLP423

feet and inches to cm and meters conversion

Hi all, so I'm taking online C++ at my college right now, and currently I have a project of converting feet and inches to cm and meters, and we have to have 3 f...

[4 replies] Last: The return type of the function is an integer type. I used long long ... (by JLBorges)

by m1smr

CMake Find<LIB>.cmake files

Hello, I'm currently learning CMake and something I don't fully understand is, how CMake knows where to find the Find<LIB>.cmake files. (Windows) For exa...

[2 replies] Last: How does CMake know where to find the Find<LIB>.cmake files. CMake m... (by mbozzi)

by fewdiefie

HLSL vs GLSL matrix multiplication

So I am converting from DirectX to OpenGL wich means I have to learn OpenGL shading language, everything is so good for now but what I don't understand yet it w...

[3 replies] Last: It makes sense to me now thank you very much guys. by "inverted" i me... (by fewdiefie)

by Reem Alnuaimi

lost in processing .

Write a program in C++ that reads integer values continuously until zero or negative value is entered. Then program should displays information about each value...

[7 replies] Last: thanks guys I will try to rewrite the code . (by Reem Alnuaimi)

by adam2016

vectors size is exponentially big, but why?

Hey guys, my vector size seems to be strangely big, the revesreVev function takes in a pointer to a vector as it's arguments and sets that pointer equal to a n...

[9 replies] Last: The std::reverse() works in-place; without additional memory. You had... (by keskiverto)

by adam2016

inheritance and casting

Hey guys, I'm following a Jamie king video on youtube (https://www.youtube.com/watch?v=TFwW36dLoHY ) about inheritance and casting, I'm still not quite sure o...

[2 replies] Last: The conditional/ternary (?:) operator is more restrictive than if-else... (by Ganado)

by nurulhudaismail

averaging each diagonal line in a matrix

Hi, I have a tridiagonal matrix and I would like to compute the average of each line of nonzero entries in this matrix. I have run the code, unfortunately, ...

[2 replies] Last: #include <iostream> #include <iomanip> #include <complex> using names... (by lastchance)

by AlexCantor

Best Undergrad C++ STL Text Books?

Any best technical content/quality & widely used undergraduate C++ STL Programming text books used at major universities of United States for the following Comp...

[3 replies] Last: I also have Ivor Horton's "Using C++ Standard Template Library", Apres... (by AlexCantor)

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