Beginners - C++ Forum - September 2022

by closed account E093605o

trying to build a basic linear algebra library

I am trying to implement a function to generate a Matrix as it is defined in my Matrix.h file initia...

[3 replies] Last: @seeplus thanks I didnt see that as usual... @JLBorges maybe - I am 3... (by closed account E093605o)

by ninja01

About conio.h

I know that conio.h is not c++ standard library nor a c standard library. Do you know any informa...

[16 replies] Last: I am still using the conio.h, and I guess it is considered a third pa... (by seeplus)

by closed account E093605o

trying to build a basic linear algebra library

I am trying to learn C++ and want to build a Matrix library. So far I have a Matrix.h file: //...

[13 replies] Last: also try to find the first error that relates to your code. You might ... (by seeplus)

by ninja01

About ASCII extended code

I just found two different ASCII code table, I am asking the following: 1: How many ASCII extende...

[11 replies] Last: This is my output in both cmd with @seeplus command and my code to out... (by ninja01)

by PhysicsIsFun

C-array as function parameter

Hi everyone! I am learning about the subtleties of C-arrays (yes, I know one should use vectors in...

[11 replies] Last: Yeah - my bad. std::span always works with std::array (by seeplus)

by ninja01

Is saying: compiling a program practically wrong?

I think when we say compiling a program, we include implicitly preprocessing it, which is not a comp...

[17 replies] Last: Thanks @Duthomhas (by ninja01)

by UnkownUser

How to make sudoku16x16 as fast as possible

Good day , I need assistance in making my sudoku as fast as possible currently it completes it in 11...

[7 replies] Last: Yes - I used a variation of that algorithm. Rather than using a bitset... (by seeplus)

by ninja01

I want to only compile not compile and link

With writing this: g++ file.cpp -o file.exe I found myself with an .exe, and I assume that this is ...

[9 replies] Last: Thank you @George (by ninja01)

by ninja01

Question 5 about optimization

Probably the last optimization question and it is about initialization Part I Consider the two snip...

[13 replies] Last: Also note that classes that have a default constructor will initialise... (by seeplus)

by codinglexernewbie

how do i implement a for loop in a math interpreter

how do I implement loops in a math interpreter? it gets the tokens but discards them after reading ...

[5 replies] Last: You may find this useful. https://github.com/ArashPartow/exprtk (by kbw)

by ninja01

Trying to compile multiple files

Consider those files: main.cpp # include "file.h" # include <iostream> using namespace std;...

[2 replies] Last: Thank you @salem (by ninja01)

by kdrewes

search for words in a file

Hi, I have a program I'm currently working on where I'm trying to read a particular city from a file...

[5 replies] Last: Trim a string: https://cplusplus.com/faq/sequences/strings/trim/ (by Duthomhas)

by AlexCantor

JSON C++

Using Visual C++ 2022 community edition to compile following JSON C++ program from book C++20 for Pr...

[9 replies] Last: Hello Seeplus: Many, many thanks for fixing the program by correct... (by AlexCantor)

by ninja01

Why const int instead of just int

const int func(void) { return 3; } In code above, what is the need of const int as ret...

[5 replies] Last: A series about using const, starting with const local variables. https... (by George P)

by ninja01

Some sort of hack?

Can I check wether my operation system is 32/64 using the code below: switch(sizeof(int*)) ...

[16 replies] Last: There are lots of web-pages with "simple code" on the internet that al... (by George P)

by ninja01

Question 3 about optimization

which one is better: for(int i=0;i<(int)strlen(bTitle);i++) or int titleLength = (int)...

[7 replies] Last: If you change the size of a c-style string within the loop, then you'l... (by seeplus)

by ninja01

Question 1 about optimization

is there any way to test which of two algorithm is best in terms of speed/efficiency and number of i...

[10 replies] Last: See how timings were done in this thread https://cplusplus.com/forum/b... (by seeplus)

by ninja01

Question 4 about optimization

Consider the two code snippet below: int side ,s ,p; cout << "Enter square's side value -> " ...

[15 replies] Last: Yeah - but that was then and this is now as they say. I used to do in-... (by seeplus)

by ninja01

Question 2 about optimization

which one is better a>=6; or a>7 I think the a>=6 does two operations while a>7 does only one, so...

[6 replies] Last: integer comparisons at assembler level tend to be based on a test inst... (by seeplus)

by ninja01

pointer to char related

Consider code below: int i = 3; int *pi = &i; double d = 5.2; double *pd = &d; char c ...

[2 replies] Last: Thank you very much @Ganado) (by ninja01)

Beginners - September 2022

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