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When working with databases in Java, there are scenarios where you might want to perform complex transactions involving multiple steps. To maintain control and flexibility during such operations, Savepoints come into play. The setSavepoint() method in the java.sql.Connection interface allows you to create a savepoint within a transaction, providing a mechanism to roll back to a specific point if needed. What is Savepoint? A Savepoint is a marker within a database transaction. It enables partial rollbacks, meaning you can undo a subset of changes made during a transaction without affecting the entire operation. This is particularly useful in scenarios where ... Read More
Here we will see how to prevent inheritance in C++. The concept of preventing inheritance is known as the final class. In Java or C#, we can use final classes. In C++ there are no such direct ways. Here we will see how to simulate the final class in C++. Approach Firstly, we will create one extra class called MakeFinalClass (its default constructor is private). This function is used to solve our purpose. The main Class MyClass can call the constructor of the MakeFinalClass as they are friend classes. One thing ... Read More
We are given an integer number let’s say, num and the task is to first calculate the binary digit of a number and then calculate the total set bits of a number. Set bits in a binary number are represented by 1. Whenever we calculate the binary number of an integer value then it is formed as the combination of 0’s and 1’s. So, the digit 1 is known as a set bit in terms of the computer. Example 1 Input − int number = 50 Output − The count ... Read More
What is Geometric Progression? A geometric progression is a sequence of numbers where each term is obtained by multiplying the previous term by a fixed number. This fixed number is known as the common ratio and it should be a non-zero. In this article, we are going to learn how we can find the sum of given n terms in geometric progression in C++. We are given first-term, common ratio, and number of terms for which we have to find the sum of geometric progression. Formula for Calculating Sum of Geometric Progression Sn= a (1 - rn)/(1 - r) ... Read More
An array is a linear data structure in which elements are stored in contiguous memory locations. As per problem statement, we have to find all the subarrays of a given array. Subarrays are part or a section of an array. When we talk about all subarrays of an array, we talk about the total number of combinations that can be made using all the elements of the array without repeating. Let’s explore the article to see how it can be done by using Java programming language. To Show you Some Instances Instance-1 Suppose we have the below array [10, ... Read More
Multilevel inheritance - A class inherits properties from a class which again has inherits properties. Example class Shape { public void display() { System.out.println("Inside display"); } } class Rectangle extends Shape { public void area() { System.out.println("Inside area"); } } class Cube extends Rectangle { public void volume() { System.out.println("Inside volume"); } } public class Tester { public static void main(String[] arguments) { Cube cube = new Cube(); cube.display(); cube.area(); cube.volume(); } } Output Inside display Inside area Inside volume Read Also: Java Inheritance
When a static keyword is used, variables, data members, and functions can not be modified again. It is allocated for the lifetime of the program. Static functions can be called directly by using a class name. Key Points of Static Variables Static variables are variables that are defined using static keywords, which consist of special behavior compared to regular variables. Here we will see its key points. Static variables are initialized only once. The compiler persists the variable till the end of the program. Static variables can be defined inside or ... Read More
Problem Description Given the length and breadth of a rectangle, we need to implement a PHP program to find the perimeter. A rectangle is a closed two-dimensional figure having 4 sides. The opposite sides are equal and parallel. The angle made by the adjacent side is equal to 90 degrees. The perimeter is the sum of all sides; in other words, the perimeter is two times the sum of length and breadth. In this tutorial, we are going to learn how we can find the perimeter of a given rectangle in PHP using different approaches. Formula of Perimeter of ... Read More
Problem Write a program to calculate the area of triangle, square, circle, rectangle and polygon by using the switch case. Solution Based on case number, the area of triangle, square, circle, rectangle and polygon is calculated. The logic used to find area of triangle is as follows − Enter sides of a triangle a, b, c s=(float)(a+b+c)/2; area=(float)(sqrt(s*(s-a)*(s-b)*(s-c))); The logic used to find area of square is as follows − Enter the side of square at runtime. area=(float)side*side; The logic used to find ... Read More
Problem Applying the software development method to solve any problem in C Language. Solution Find roots of a quadratic equation, ax2+bx+c. There will be 2 roots for given quadratic equation. Analysis Input − a, b, c values Output − r1, r2 values Procedure $r_{1}=\frac{-b+\sqrt{b^2-4ac}}{2a}$ $r_{2}=\frac{-b-\sqrt{b^2-4ac}}{2a}$ Design (Algorithm) Start Read a, b, c values Compute d = b2 4ac if d > 0 then ... Read More