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C++ Articles
Page 334 of 597
C++ Program to Implement Segmented Sieve to Generate Prime Numbers Between Given Range
The Segmented Sieve algorithm is used to find the prime numbers within a given range. Segmented Sieve first uses the Sieve of Eratosthenes algorithm to find the primes smaller than or equal to √(n). The idea of this algorithm is to divide the range [0 ... n-1] in different segments and compute primes in all segments one by one. In this article, we have a range defined from low to high. Our task is to implement the Segmented Sieve to find the prime numbers within the given range in C++. Example The following example generates all the prime numbers between ...
Read MoreCatching base and derived classes exceptions in C++
To catch an exception for both base and derived classes, we need to put the catch block of the derived class before the base class. Otherwise, the catch block for the derived class will never be reached. This happens because C++ follows a top-down approach when checking catch blocks. So, by placing the derived class catch block first, we ensure that specific exceptions are handled correctly before falling back on the base class. Algorithm Following is the algorithm to catch Base and Derived classes Exceptions in C++: Begin Declare a class B. Declare another ...
Read MorePrint “Hello World” with empty or blank main in C++
In this problem, we will see how to print "Hello World" into the console, but we cannot write anything into the main function. This problem can be solved in different ways. Initially, we will create a global variable, then we will store the returned value of the printf() function into that variable. When printf() is executed, then it will be printed. You can print "Hello World" without using the logic inside the main() function in different ways, such as using Global Constructors, Class Object and macros, or preprocessor, etc. Using Global Constructor A global constructor is the constructor of a global object ...
Read MoreWhat are cin, cout and cerr streams in C++?
The cin, cout, cerr, and clog are streams that handle standard input and output stream objects, which are defined in an header file. Standard Output Stream (std::cout) The cout is an object of class ostream that represents the standard output stream oriented to narrow characters (of type char). It corresponds to the C stream stdout. The standard output stream is the default destination of characters determined by the environment. This destination may be shared with more standard objects (such as cerr or clog). Syntax Here is the following syntax for cout in C++: cout
Read MoreC++ Program to Implement the Rabin-Miller Primality Test to Check if a Given Number is Prime
Rabin-Miller algorithm is a probabilistic primality test algorithm that is used to checks if a given number is likely to be a prime number or not. It is similar to the Fermat's primality test and the Solovay-Stressen test. In this article, we have a number 'p'. Our task is to implement the Rabin-Miller algorithm to check if the given number is a prime number or not in C++. Example Here is an example of checking prime numbers using the Rabin-Miller algorithm: Input: p = 41 Output: 41 is a prime nnumber Here is the explanation of the ...
Read MoreC++ Program to Generate Prime Numbers Between a Given Range Using the Sieve of Sundaram
The Sieve of Sundaram method is used to generate the prime number within the given range. In this method, first we mark the indices with prime number using the mathematical formula. Then, we use the unmarked indices to get the prime numbers within the given range. In this article, we have defined a range i.e. 'm = 30'. Our task is to generate prime numbers up to 'm' using the Sieve of Sundaram method in C++. Example Here is an example of generating prime numbers up to 10 using the Sieve of Sundaram method: Input: M = 10 Output: ...
Read MoreHow to declare a pointer to a function in C?
In C, a pointer is a variable whose value is the address of another variable or memory block, i.e direct address of the memory location. Like any variable or constant, you must declare a pointer before using it to store any variable or block address. Basic Pointer to a Function A pointer to a function is simply a variable that stores the address of a function instead of a normal data value. Syntax Following is the syntax of basic pointer to a function: Datatype *variable_name Algorithm Following is the algorithm for the basic pointer to a Function: Begin. ...
Read MoreZombie and Orphan Processes in Linux
Every program runs as a process in Linux operating system. When a process ends or gets disconnected from its parent, special types of processes can be created. These processes are known as zombie and orphan processes. Details about the zombie and orphan processes are given as follows: Zombie Processes A zombie process is a process whose execution is completed but it still has an entry in the process table. Zombie processes usually occur for child processes, as the parent process still needs to read its child's exit status. Once this is done using the wait system call, the zombie process ...
Read MoreHow to initialize memory with a new operator in C++?
In C++, the new operator is mainly used for allocating memory on the heap, but to initialize that memory, you need to explicitly declare and provide a value to it.Here, the new operator dynamically allocates memory for a variable or object during runtime and returns a pointer to the allocated memory. Here are the following ways you can initialize memory using the new operator: For built-in types For arrays For objects new Operator in Built-in Types The built-in types are the basic data types in C++, which ...
Read MoreC++ Program to Implement List in STL
A List in C++ STL library is hardcoded implementation of a doubly linked list data structure. In this article, we will learn how to implement and use a list in C++ . What is List? List is a doubly linked container provided in the C++ STL library, in which each element points to both its previous and next elements. Meaning, in this list we can quickly traverse in both forward and backward direction using pointers just like a doubly linked list. Compared to vectors or arrays, these lists allow fast insertions and deletions from the middle of the sequence. ...
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