The return keyword is an important part of any function, whether it is a main function or a user-defined function. It is used to return a value from a function to the calling program. The return keyword is used to indicate the end of a function and to return a value to the calling program. … Read more
This question is related to an error regarding the use of std::istream and int x. This type of error can be caused by a variety of issues, such as incorrect syntax, incorrect data types, or incorrect usage of the std::istream library. In this post, we will discuss the possible causes of this error and how … Read more
Introduction The C++ vector is a powerful container that allows for dynamic memory allocation and efficient data manipulation. However, it is possible to encounter errors when attempting to use the vector, such as the “Size of C++ vector is invalid” error. This error occurs when the size of the vector is not valid, either because … Read more
Introduction Compile errors can be a source of frustration for many developers. In this article, we will discuss a particular compile error: “Only assignment, call, increment, decrement, and new object expressions can be used as a statement”. We will explain what this error means and how to fix it. We will also provide some tips … Read more
From your post: Delete Deallocates storage previously allocated by a matching operator new. When you use: float x, y; x = y = 0; float * p = &x; delete p; you are not following that statement. p does not point to an object that was allocated by operator new. It points to a local … Read more
There are a great deal of possibilities that you can look at. One that I have had one of the greatest experiences with is the Simple Directmedia Layer. It doesn’t come with a drag-and-drop graphics designer like Visual Studio (Is that what you mean by ‘UI designer’?). However its api is fairly powerful and as … Read more
FOUND THE ISSUE. I simply created another header and cpp file, then deleted them both and visual studio woke up and removed the error. Weird 1 solved What does having “< >” around a pointer mean/do? C++
string timeString = “20150828020000UTC”; IFormatProvider culture = new CultureInfo(“en-US”, true); DateTime dateVal = DateTime.ParseExact(timeString, “yyyyMMddHHmmss’UTC'”, culture); 2 solved How to parse date YYYYMMDDHHMMSSUTC [closed]
You are setting all of your valuables to 0 at the beginning. Try: int radius: at the beginning, this will create your variable but not give it a value, then after cin >> radius; you can do basically what you had before: cin >> radius; auto area = radius*radius * 3.14; auto amount = area … Read more
You did not show the code which adds the Child*s to the vector, but the symptoms you describe provide compelling evidence that you used pointers to some kind of local or temporary objects, which go out of scope (are destroyed) while the vector still holds the pointers. Your program hangs as a result of using … Read more
Try this. ClassA example; example.a =.01; You were using pointers in your code, and it looks like you need practice with other ideas before starting with pointers. 11 solved C++ Object Variables
This is an overly simplified example of what you could do, using only .NET classes: public static string TimeSinceEvent(DateTime eventTime) { TimeSpan timeSince = DateTine.Now – eventTime; if (timeSince.Hours > 0) return string.Format(“Added {0} hours ago”, timeSince.Hours); else if (timeSince.Minutes > 0) return string.Format(“Added {0} minutes ago”, timeSince.Minutes); else return string.Format(“Added {0} seconds ago”, timeSince.Seconds); … Read more
The 1st alternative will cause a memory leak whether you pass true or false to the constructor of Derived. Exactly one Structure will be allocated on the heap, which is then copied by the default copy constructor of Structure when the assignment var = structure; is executed. If you: replace the internal var variable type … Read more
TL;DR: do it the obvious way, and make sure your compiler optimizes it. It’s hard to reason about performance without a full, reproducible program example. So let’s start with a straightforward implementation: #include <array> #include <algorithm> std::array<int, 362856427> a = {}; int main() { a[500] = 1; a[5000] = 1; a[50000] = 1; a[500000] = … Read more
List<Customer> customerList = GetAllCustomers(); string subject = “Hello World”; string content = GetContent(); // Loop through all customers and send e-mail to each foreach(Customer customer in customerList) { MailMessage newMail = new MailMessage(“[email protected]”, customer.Email, subject, content); newMail.IsBodyHtml = true; SmtpClient sender = new SmtpClient(); sender.Send(newMail); } You can move the GetContent() within the loop if … Read more