General C++ Programming - January 2021 (Page 2)

by MS35
Additional C++ Help
 
Hi everyone, I am currently attempting and trying to familiarize myself with c++. I am very new and...
[5 replies] Last: Thank you guys! I have an idea on what to do, thanks for the hints. I ... (by MS35)
Read file from second line
 
Hi, I have a file that contain data about student. File contain in this order 1.name of student 2.id...
[1 reply] : >> leaves the trailing newline that the following getline() obtains as... (by seeplus)
by frek
Move constructor/assignment operator
 
A move cotr/assignment optr is called when there's an rvalue reference (a temporary object) assigned...
[4 replies] Last: the move constrcutor is not called! Yes, this is commonly known as "c... (by coder777)
by frek
Smart pointers proper usage in a simple program
 
Hi, The following is a theoretical project whereby I struggle to get through the challenge of amb...
[6 replies] Last: > Which one should I use for this project and why You should not be u... (by JLBorges)
by PeteDD
Constructing class objects using names from an array
 
Is there a way to construct class objects by using names which are stored in an array as the names o...
[7 replies] Last: Blindly ignoring the costs of a.) writing code that does nothing; and... (by mbozzi)
by mpg
g++ codice.cpp -L dependencies \lib -lpq -o codice
 
I use PostgreSQL. I write in the terminal: g++ codice.cpp -L dependencies\lib -lpq -o codice but ...
[1 reply] : What does ls print? ..or dir, if vanilla Windows (by Ganado)
by Ocko91
Mega milions
 
Hi there; I want to make program that show me ,how long I need to wait for my lucky day. I want to s...
[4 replies] Last: You've misunderstood the question. He wants to simulate playing the sa... (by dutch)
IF Statement
 
I want to make a program that asks the user to type "HI". But when that it is stored in the variable...
[1 reply] : and what part of this requirement don't you understand/am having diffi... (by seeplus)
by frek
std::string or std::string_view
 
Hi all, I found this interesting thread: http://www.cplusplus.com/forum/beginner/240488/#msg1070623...
[7 replies] Last: > So for anything that's using an std::string_view we must pay enough ... (by JLBorges)
by gwbots
Steam Proton (Linux) and Reverse Engineering Question (General + Noobish)
 
I'm trying to run a old Windows game and its companion tool (user-created) under Linux. Since the ...
[1 reply] : you can just try it but it may not work at all, depending on what it d... (by jonnin)
by fjl
Parametric Polymorphism and References
 
I get the feeling that this is a bad idea in C++, but before I abandon trying to make it work and go...
[3 replies] Last: > Do you, perchance, have chapter and verse on it? The gory details a... (by JLBorges)
by frek
Range-based for on std::vector
 
Hi, Can't we define auto so that it provides us with an iterator to the elements of the STL conta...
[2 replies] Last: Thank you for your answer. (by frek)
by frek
Copy assignment definition for a user-defined type
 
Good day guys, Is the implementation for the assignment operator below correct, please? If not, why...
[7 replies] Last: > if we defined the operator the following way what would be the probl... (by JLBorges)
by frek
Code review
 
Hi devs, I've got an old code of mine (pertaining to a slightly long time ago that I've forgotten m...
[16 replies] Last: Guys, the issue about that if statement is arguably easy! My bad! ln-... (by frek)
Printf '%e' expects type 'double' but argument 2 has type 'double *'
 
Hey! I am doing unit testing on my c++ code on VS code windows, however I am stuck with a simple is...
[3 replies] Last: The fftw_complex type holds a complex number as a 2-element array of d... (by dutch)
Conversion from COMPREAL to REAL and float
 
The following code is from a C file: venext.c. It is associated with the simulation software Vensim ...
[2 replies] Last: the pointer ones may actually break something. The first one is about... (by jonnin)
 
[1 reply] : float a ; a = distances_1 / distances_2 The last valid index ... (by thmm)
by de555
How do I get rid of , —, and other mystery characters?
 
I am trying to read a txt file but the output starts with "" and all of the long dashes are...
[4 replies] Last:  UTF-8 bytes: EF BB BF ZERO WIDTH NO-BREAK SPACE Hex code po... (by dutch)
by PacR
Change fast inverse square root to regular square root?
 
How to edit this code to get regualr square root instead of inverse square root? float q_qsqrt...
[2 replies] Last: Thank you jonnin. I used approximations that depend on the floating po... (by PacR)
How to draw 3d polygon maps without an editor?
 
Hey, I am working on a game engine and I am at the point of needing to understand how to draw 3D map...
[1 reply] : most engines import 3-d objects from an editor program; these are a lo... (by jonnin)
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