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Page 1512 of 2109
What is arrow operator in C++?
The array operator provides the direct access to array elements using their index. What is Array Operator in C++? The arrow operator in C++ is also known as the member access operator, which is used to access a member of a class, structure, or union with the help of a pointer to an object. The arrow operator allows you to directly access the member, unlike the dot operator, which first dereferences the pointer and then uses the dot operator to access it. So instead of using (*pointer).member, you can directly use pointer->member. Syntax Here is the syntax to access array ...
Read MoreAccessing protected members in a C++ derived class
A class in C++ has the following access modifiers: public, private, and protected, which contain the corresponding class members. The protected members in a class are similar to private members as they cannot be accessed from outside the class, but they can be accessed by derived classes or child classes, while private members cannot. In this article, we will see various examples of how to access protected members in C++ and how it is different from private members. Accessing Protected Variable in C++ In this example, we have initialized a protected variable value in the parent class. We ...
Read MoreCalculate range of data types using C++
Here, we are going to learn how we can calculate the range of the different C++ data types such as signed data types (int, char, float, etc.) and unsigned data types (unsigned char, unsigned int, unsigned float, etc.). Calculating Range of Signed Data Types In C++, signed data types are used to represent both positive and negative integer values. So, to display their range, we use the following method − Calculate the total number of bits, multiply the sizeof bytes by 8. Calculate -2^(n-1) for minimum range ...
Read MoreDifference between std::vector and std::array in C++
Both vectors and arrays are used to store collections of elements, but they differ significantly in how they manage their memory and flexibility. C++ std::vector A vector is a dynamic array that can be resized automatically when elements are added or removed. It is a part of the C++ STL and provides more flexibility than a static array. Example In the following example, we will demonstrate the usage of the vector in C++ − #include #include using namespace std; int main() { vector > v { { 4, 5, 3}, {2, 7, 6}, {3, 2, 1, 10} }; cout
Read MoreWhy we should avoid using std::endl in C++
In this article, we will see why we should avoid the std::endl while printing lines into the console or a file. We use std::endl to create a new line after the current line. For a few lines of I/O operations, it is not causing any problems. However, a large number of I/O tasks decreases performance. Why We Avoid Using std::endl There are the following reasons to avoid endl: The endl is used to create new lines, but it does not send to the new line only; after sending the cursor to the next line, it ...
Read Morefork() to execute processes from bottom to up using wait() in C++
The fork() system call is used to create a process commonly known as a child process if the fork() returns 0. Otherwise, the created process is known as the parent process. All processes created with fork() execute in parallel. But what if we want the last process to be executed first? In this case, the parent process would execute last because of bottom-to-top execution. This can be done using the wait() system call. The wait system call is used to process handling. It pauses the execution of the calling process until the child process has finished its execution. It's commonly ...
Read Morereference_wrapper in C++
std::reference_wrapper is a class template in C++ that allows you to store references to objects or functions in a way that makes them copyable and assignable. Normally, C++ references can't be stored in standard containers like std::vector or std::list, because references are not copyable. std::reference_wrapper solves this problem by internally storing a pointer to the referenced object. It acts like a wrapper around a reference and behaves almost like the original object. It can be passed to functions that take T& (a reference to T), because std::reference_wrapper is implicitly convertible to T&. This is especially useful when you ...
Read MoreCalculation in parent and child process using fork() in C++
The fork() function creates a new process by duplicating the current one. It allows developers to perform parallel tasks and manage resources efficiently. When fork() is called, it returns a value. If the value is greater than 0, then it is in the parent process. Otherwise, it is in the child process. In this C++ article, we will learn how to use the fork() system call to perform calculations in parent and child processes.According to the problem statement, we will do calculations. So, in our parent process, we will find the sum of all even numbers in an array, and ...
Read MoreC++ Program to Implement a Binary Search Tree using Linked Lists
A linked list is a linear data structure in which we store a sequence of elements, where each element is called a node that contains data and a pointer (or link) to the next element in the sequence. In this C++ article, we will implement a Binary search tree using a linked list. Binary Search Tree A binary search tree is a hierarchical data structure that is constructed by nodes. Each node contains a value and its reference to the left and right child nodes. So the value in the left child node is less than the parent node, and ...
Read MoreWhat are the allowed characters in Python function names?
In Python, function names follow specific rules. A valid function name can only contain certain characters, and it must follow the naming conventions defined in the Python language syntax. Using the correct characters ensures that your code runs without syntax errors and stays readable. Allowed Characters in Function Names Python function names can consist of the following characters - Letters (A–Z, a–z) Digits (0–9) — but not at the beginning Underscores (_) — often used to separate words Function names must follow these rules - Must start with a letter or underscore Cannot start with a digit ...
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