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Lead Number in java
A lead number is a number whose sum of even digits is equal to the sum of odd digits. In this article, we will learn about lead numbers and programs to check if a number is a lead number or not. Lead number example Let’s take the number 615341. The sum of even digits is 6 + 4 = 10. The sum of odd digits is 1 + 5 + 3 + 1 = 10. Here, the sum of even digits = the sum of odd digits, so 615341 is a lead number Arithmetic Approach This approach extracts digits ...
Read MoreJava Program to Implement Associative Array
What is an associative array? An associative array stores data in key-value pairs where we can retrieve values using unique keys. There is a significant difference between standard arrays and associative arrays. Normal arrays use numbers for indexing (like arr[0], arr[1], arr[2]). Whereas in an associative array, we use meaningful names such as "name" or "city” to identify each value. Example Let's consider a list of student grades where names act as keys − Key (Student Name): Value (Marks) Raju: 85 Krishna: 90 Yash: 78 This lets us find the grades of students by using their names instead of ...
Read MoreJava Program to Print Odd Elements at Odd Index
In this article, we will learn how to find and print the odd numbers that are present at odd index positions in an array. First we will understand the problem with the help of an example, and then we will learn three approaches to implement it in Java. Example Consider the array = [2, 1, 4, 4, 5, 7]. The odd numbers at odd indices are 1 and 7. Explanation The indexing of an array starts from 0. Here the element 1, which is an odd number, is present at index 1, which is an odd index. In the same ...
Read MoreJava Program to Generate Random Hexadecimal Value
In this article, we will learn how to generate random hexadecimal number values in Java. Random hexadecimal values are used in many applications, like unique identifiers, cryptographic keys, session tokens, or colour codes. We will discuss three different ways to generate random hexadecimal values in Java − Using Random – A simple, fast method to make random hexadecimal values. Using SecureRandom – Best for secure random hexadecimal numbers. Using BigInteger – Helps produce large random hexadecimal numbers. 1. Using Random In this approach, we use the Random class to produce random numbers from 0 to 15. After ...
Read MoreJames Gosling:The Father of Java
James Arthur Gosling, also known as the Father of Java, is one of the greatest minds in computer science and programming history. He created the Java programming language in 1994, which became a revolutionary invention that transformed the software development industry. Java lets developers run a single code on any device, which makes it a platform-independent language. Other than java, Gosling has worked on several technical areas such as Artificial intelligence, software engineering and cloud computing. Early life and education James Gosling was born on May 19, 1955, in Calgary, Alberta, Canada. He developed an interest in computers at an ...
Read MoreJava Program to Increment All Elements of an Array by One
Arrays are one of the most fundamental data structures in programming, and they are used to store elements of the same data type in contiguous memory locations. If you are not familiar with the array concept, do check out this article on Arrays. In this article, we will learn how to increment every element of an array by one and print the incremented array. For example, If the input array is [3, 7, 10] The output should be [4, 8, 11] We can solve this problem using different approaches − Using for-loop Using java streams Using arrays.setAll() ...
Read MoreHow to find hyperfactorial in Java?
What is hyperfactorial? The hyperfactorial of a number is the product of numbers from 1 to the given number where each number is raised to the power of itself. For example, the hyperfactorial of 4 will be − = 1^1 * 2^2 * 3^3 * 4^4 = 1*4*27*256 = 27648 So we can say that the formula for finding hyperfactorial is − H(n)=1^1 * 2^2 *3^3 * 4^4 * 5^5 * . . . . . . . . . * n^n In this article, we will learn different approaches to find the hyperfactorial of a number, ...
Read MoreHow to pad a String in Java?
What is string padding? String padding means adding extra spaces or characters to the string to reach a specified length. This extra character or space can be added before the string, after the string, or on both sides of the string. This is useful for formatting output or aligning text in documents in order to improve the overall appearance of the content. For example, while displaying a table, padding helps to align the content properly so that every column in the lineup is correct. Approaches to pad a string in Java There are multiple approaches to pad a string in ...
Read MoreC++ Program to Find Fibonacci Numbers using Dynamic Programming
In this article, we will learn how to calculate Fibonacci numbers efficiently using dynamic programming in C++. The Fibonacci sequence starts with 0 and 1, and each next number is the sum of the two preceding ones. The basic recursive method works but becomes very slow for larger numbers because it repeats the same calculations many times. Dynamic programming solves this by storing the results of previous calculations, which makes the process much faster and more efficient. For example, if we want to find the 6th Fibonacci number, the sequence will look like this: F(0) = 0 ...
Read MoreAll reverse permutations of an array using STL in C++?
In this problem, we need to generate all reverse permutations of a given array using C++'s Standard Template Library (STL). A permutation is simply rearranging the elements of the array in every possible order. For example, with an array of three elements, there are six possible ways to arrange them. For each of these permutations, we need to reverse the order of the elements and then print the results. The goal is to first generate all possible permutations of the array, then reverse each one before displaying them. Example Scenario: Let's say we have the array {1, 2, 3}. ...
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