cstring | A simple C string lib | Runtime Evironment library
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A simple C string lib
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QUESTION
I am trying to make a class like string(for learning purposes) and i have the following files
var.cpp:
...ANSWER
Answered 2021-Jun-13 at 15:56Rule of 3\5 not followed so returning var from operator= in constructor results in shallow copy of var, The temporal object then gets deleted and it frees memory.
You have to
a) have implement copy constructor;
b) Fix that destructor, because it leaks memory if string is empty (but there is still memory allocated);
c) consider avoiding use of strdup and free and use new\delete and memcpy.
QUESTION
#include
#include
using namespace std;
int main(){
char first_name[20] {};
cout << "Enter Your First Name : ";
cin >> first_name;
cout << "Hi "<< &first_name <<", Welcome to C++ Programming.";
return 0;
}
ANSWER
Answered 2021-Jun-13 at 14:35Just use the c++ string instead
QUESTION
My code won't compile and I don't know how to fix it. It looks like the problem is maybe with the "=" operator but I'm not sure. I'm trying to apply a given function on the elements of the sorted list in order to get a different sorted list, but it says that I'm using different arguments than the expected. My code looks like-
...ANSWER
Answered 2021-Jun-12 at 11:19Your copy assignment operator is bringing you the trouble.
The LinkedList apply(A func) function returns (by value) a LinkedList, which then in turn is used in this line, in main.cpp...
QUESTION
I'm with a problem when using memcpy function.
I need to create an array of unsigned char with three parts: id, size of data array, data array. But I couldn't do nor the first part yet.
ANSWER
Answered 2021-Jun-11 at 03:595 in ASCII is not printable since it's a control character. ASCII Table
You can try below and it will print a as expected.
QUESTION
I'm trying to print a Sorted List and it looks like the list itself is correct- by printing the inner results, but when I try to print the whole list it shows some weird symbols and crashes. Where am I wrong? This is my main with the function I'm calling in "apply":
...ANSWER
Answered 2021-Jun-11 at 14:08This line:
QUESTION
EDITED
I have some problems, probably with the destructor, but I can't find the problem. I'm pretty new to cpp so I'm not exactly sure why and when the destructor is called, but when I try to debug my code I find no issues and get everything printed correctly, but when I run it without debugging it prints just the Hello World and that's it. How can I fix this if in debug I don't see it? Where is the problem?
My code looks like that : (EDITED)
...ANSWER
Answered 2021-Jun-10 at 14:04In the standard library, the end iterator is one place past the end of the container. To be compatible with the standard library, your end() method should be:
QUESTION
I'm writing this code for generic sorted list, and I have to write a filter method, without knowing what type of argument I will get. So I wrote it like that :
...ANSWER
Answered 2021-Jun-10 at 10:11You pass an entire Dummy to the predicate function when you call pred((curr -> data). pred, coming from the line dummy1 = dummy1.filter(teeth_list, &func);, is a function expecting an int, which it doesn't get.
There are a couple of potential fixes.
- Use a function that expects a Dummy (and extracts the teeth itself ;-) ).
- Pass the number of teeth (which are currently inaccessible), not the entire Dummy.
- Providing a conversion operator to
intinDummy(presumably returning the number of teeth) should work as well.
The conversion operator approach seemed to work for me. I inserted
QUESTION
I want to make a label using SwiftUI showing text in 3 colors i.e. ABC (A in black, B in gray, C in red) by following code
...ANSWER
Answered 2021-Jun-09 at 10:08A clean and clear approach that still produce the expected result would be:
QUESTION
I am working on an MFC dialog application. I created a progress control (IDC_PROGRESSUPLOADING) in the dialog interface and add a variable m_progress for this control. The m_progress is passed to a function (start_update), which will set and display the progress control.
Dlg.h
...ANSWER
Answered 2021-Jun-09 at 02:34Your start_update() function takes its arguments by value. So, when you call that, the compiler needs to make copies of the two arguments – and you can't copy a CProgressCtrl object.
Probably, the easiest way round this is to make the second argument to start_update() a reference (and also the first, CString, argument, too, would likely do no harm):
QUESTION
This is my code :
...ANSWER
Answered 2021-Jun-08 at 12:01Ok, so this is a fun one. Have a look here:
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