Beginners

by admin
Welcome -- read before posting!
 
Welcome to the beginner's forum in C++.com! In this forum, users can to talk about any topic relate...
[2 replies] Last: How To Answer Questions in a Helpful Way Be gentle. Problem-relat... (by admin)
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 cons...
[120 replies] Last: It displayed "Hello world" after you pressed Enter. int c is a ... (by Duthomhas)
Namespace std not recognized in public API.h for shared library
 
It has been quite a while since I was working intermittently on my project to write a C++ shared lib...
[18 replies] Last: double free or corruption You could be trying to free memory after... (by seeplus)
Segmentation fault (core dumped)
 
Hi, I get strange segfault error when working with hierarchy of c programs (3 stages) I can give a ...
[6 replies] Last: Thanks folks, the error was due to a buffer overflow of char array I ... (by Jonathan100)
by zzzhhh
It is known that we can't initialize rvalue reference with lvalue, but why can function name?
 
It is said that we can't initialize an rvalue reference with an lvalue. For example: int i=0; int &...
[5 replies] Last: And the standard you cited is two floors above: "http://eel.is/c++dra... (by mbozzi)
by zzzhhh
Why is const gone in the return type?
 
template <typename T> const T&& Test(T&& t) { return t; } ...... int i = 0; int&& irr = std::mov...
[5 replies] Last: @Peter87: Thank you for referring me to the relevant Standard. I think... (by zzzhhh)
Convert binary to base 58
 
I want to convert a long binary number, 256 bits, into a base 58 char array using c code. I cannot ...
[10 replies] Last: I get the same result on those 2 sites (dcode only accepts decimal inp... (by DizzyDon)
by Ch1156
Best way to modify a variable in a class (1,2,3,4)
 
So whats the best way to modify a variable in a class? Below I have a version that does so through a...
[63 replies] Last: I suggest you look into OOP class design using UML etc. This will give... (by seeplus)
Finding minimum element of a tuple on the basis of first element
 
Hello everyone, I do not know, if it is possible to find the minimum first element in a tuple wi...
[5 replies] Last: I have a tuple like this : data=[ ( 23, a, 3.78, d), ( 11, x, 5.8, w)... (by seeplus)
by zzzhhh
Which ctor of std::unique_ptr is used, when there is a user-defined deleter which is a function?
 
Following is excerpted from section 12.1.5 of text "C++ Primer", which contains text and code constr...
[1 reply] : The code calls constructor 3 or 4. When the cppreference page writes ... (by Peter87)
txt file to vector giving wrong values
 
I'm loading a txt file into a vector using the code I've written below. It works great except for o...
[11 replies] Last: There's a good (and free) set of C++ tutorials and lessons available o... (by George PlusPlus)
by zzzhhh
Why can't assign an overloaded function to std::function?
 
int add(int i, int j) { return i + j; } std::string add(const std::string& s1, const std::string...
[1 reply] : There is a constructor template and a class template in play here, and... (by mbozzi)
C++ Questions (1,2,3,...,10,11,12,13)
 
1) Why does "&myChar " act differently in 2 different contexts? char* pointer = &myChar ; //A...
[246 replies] Last: I agree with the search fiasco and the current state, but it does leav... (by SubZeroWins)
by Ch1156
When to use const class member variables? (1,2)
 
So while doing something, I made a member of my class const, and i got errors, upon some cursory res...
[21 replies] Last: Ok, so its perfectly ok to use static const, and to make it non copyab... (by Ch1156)
lest shift an u8 array
 
Hi. I have an exsiting u8 array in a function (function that get u16 array as argument). How can i ...
[2 replies] Last: what you had is probably close. remember that c++ starts at zero. th... (by jonnin)
const keyword in function declaration
 
#include <iostream> #include <iomanip> using namespace std; const int NUMCOLS=4; const int TB...
[2 replies] Last: thanks buddy (by hassan236)
size_t implicit conversion
 
Greetings! I have a loop that doesn't want to break when it should. for (int i = Xdata.size...
[17 replies] Last: I swear I’m getting senile. I'm getting there first. :|... (by George PlusPlus)
operator const char* return (1,2)
 
Hi y'all i was wondering if i can have something like this on one line? return (ss.str().c_str())...
[39 replies] Last: If I were to start using command-line compilation I would probably go ... (by George PlusPlus)
ASM code and C++
 
Hallo, cplusplus. i am trying to get a bios interrupt call to the bios in c++. but compiling i...
[3 replies] Last: OP is clearly not messing with programming on modern systems. Hints: ... (by Duthomhas)
Looking for tutor for OOP class
 
Hi everyone, I dont know if this is the right channel to ask this but im starting to fall behind pre...
[3 replies] Last: I can help you out with what I know currently. Tag me if you are inter... (by CodeChaser)
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