Programming Articles - Page 2387 of 3363

Almost Perfect Number in C++ Almost Perfect Number is a positive integer n for which the sum of all its positive proper divisors (excluding the number itself ) is equal to n-1. (i.e., one less than the number n). It is also known as the least deficient number or slightly defective number. A positive proper divisor is a divisor of a number, excluding the number itself. For example, for n = 6; 1, 2, 3 are positive proper divisors but 6 itself is not. In Mathematics, we say A number n is almost perfect if: σ(n)-n = n-1 by ... Read More

Allocate a minimum number of pages is a programming problem. Let's discuss this problem in detail and see what can be the solution to it.StatementYou are given the number of pages of n different books. Also, there are m students to whom the books are to be assigned. The books are arranged in ascending order of the number of pages. And every student can be assigned some consecutive books. The program should return the maximum number of pages read by a student which should be minimum.Let's take an example to understand this problem in a better way, Input : books[] ... Read More

In the C programming language, there is an option to create an arc of a circle of a given radius with a given center coordinates and degree of the arc.The arc() function is used to create an arc. This arc function is included in graphics.h library in C which contains methods that can draw figures on the output screen.Syntaxvoid arc(int x, int y, int startangle, int endangle, int radius);Now, let's get deep into the function and understand each parameter passed and output returned by the function.Parametersx − type = int, function: defines the x coordinate of the center of the arc.y ... Read More

The Fibonacci sequence starts from 0 and 1, and each number is the sum of the previous two. In this problem, we are given a number n, and we need to print the first n numbers from the Fibonacci series, but only the numbers at alternate positions (like 0th, 2nd, 4th, and so on). Let's look at some example scenarios to understand it clearly: Scenario 1 Input: n = 7 Output: 0 1 3 8 Explanation: The first 7 Fibonacci numbers are 0 1 1 2 3 5 8. If we pick alternate numbers (index 0, 2, ... Read More

C++ alignof() Operator The alignof operator is the operator that returns the memory alignment for a given variable type. This alignment tells how the data is arranged and accessed in memory. It returns the value in bytes and is the part of the header file in C++. which is mainly used for low-level programming like memory management or hardware requirements. Syntax Here is the following syntax of alignof operator, which returns memory alignment required for a given data type in bytes: alignof(data_type) Example Demonstrating Usage of alignof() Operator Here is the following example code of using alignof() operator ... Read More

The @JsonProperty annotation can be used to indicate the property name in JSON. This annotation can be used for a constructor or factory method. The @JsonCreator annotation is useful in situations where the @JsonSetter annotation cannot be used. For instance, immutable objects do not have any setter methods, so they need their initial values injected into the constructor.@JsonProperty - ConstructorExampleimport com.fasterxml.jackson.annotation.*; import java.io.IOException; import com.fasterxml.jackson.databind.*; public class JsonCreatorTest1 {    public static void main(String[] args) throws IOException {       ObjectMapper om = new ObjectMapper();       String jsonString = "{\"id\":\"101\", \"fullname\":\"Ravi Chandra\", \"location\":\"Pune\"}";       System.out.println("JSON: " + jsonString);   ... Read More

Divide and conquer is an algorithm that works on the paradigm based on recursively branching problem into multiple sub-problems of similar type that can be solved easily.ExampleLet’s take an example to learn more about the divide and conquer technique −function recursive(input x size n)    if(n < k)       Divide the input into m subproblems of size n/p.       and call f recursively of each sub problem    else       Solve x and returnCombine the results of all subproblems and return the solution to the original problem.Explanation − In the above problem, the problem ... Read More

Before digging deep into the topics lets brush up all the related terms.A copy constructor is a special type of constructor that is used to create an object that is an exact copy of the object that is passed.A virtual function is a member function that is declared in the parent class and is redefined ( overridden) in a child class that inherits the parent class.With the use of a virtual copy constructor, the programmer will be able to create an object without knowing the exact data type of the object.In C++ programming language, copy Constructor is used to creating ... Read More

A JSONObject is an unordered collection of name/value pairs and parses text from a String to produce a map-like object. However, we can auto-increment the property of a JSONObject using the increment() method of JSONObject class. If there is no such property, create one with a value of 1. If there is such a property and if it is an Integer, Long, Double or Float then add one to it.Syntaxpublic JSONObject increment(java.lang.String key) throws JSONExceptionExampleimport org.json.JSONException; import org.json.JSONObject; public class IncrementJSONObjectTest {    public static void main(String[] args) throws JSONException {       JSONObject jsonObj = new JSONObject();       jsonObj.put("year", 2019);     ... Read More

The JSON is one of the widely used data-interchange formats and is a lightweight and language independent. We can convert a JSONObject to cookie using the toString() method and convert a cookie to JSONObject using the toJSONObject() method of org.json.Cookie class.Convert JSONObject to cookieSyntaxpublic static java.lang.String toString(JSONObject jo) throws JSONExceptionExampleimport org.json.Cookie; import org.json.JSONObject; public class JSONObjectToCookieTest {    public static void main(String args[]) {       JSONObject jsonObject = new JSONObject();       jsonObject.put("path", "/");       jsonObject.put("expires", "Thu, 07 May 2020 12:00:00 UTC");       jsonObject.put("name", "username");       jsonObject.put("value", "Adithya");       String cookie = Cookie.toString(jsonObject); ... Read More