getting input from the user, calculating area, and displaying the area of a circle in the console. area and radius should be correlated. ( here import is a keyword in java used to get features from inbuilt packages. Input : radius= 5 Output: Area of circle is : 78.55 Input : radius= 8 Output: Area of circle is : 201.08 Area of circle is :78.55 Find the Area of a Circle in Java Program Print the result. It's like converting the circle to a rectangle and then calculatingare of a rectangle. You can see from the above diagram that how the formula for calculating the area of a circle arrives. The following Java program to print the area of a circle has been written in five simple different ways, static method, using constructor, Interface, inheritance with sample outputs for each program. This single method is enough to put all the code required for this program e.g. (, Write a program to check if a number is even or odd in Java? : is a constant, whose value is 3.1415 or 22/7. How to Fix Unsupported major.minor version 60.0, 5 What is Method Overriding in Java ? STEP 4: Read the radius of the circle from the user into the variable r. STEP 5: Calculate area as a=pi*r*r. STEP 6: Display area as a. (, How to print Alphabets in upper and lower case in Java? Powered by, /* (. java program to find the area of a circle. Difference between OCAJP7, OCAJP8, and OCAJP11 Cer 10 Example of jQuery Selectors for Beginners. Here's the formula to calculate area of circle, area = 3.142 * r * r Table of contents: 5 Simple ways to print AOC, # Below is the online execution tool, for the following program . As we know to calculate the area of a circle, the radius of the circle must be known, so if the radius of the circle is known, then the area of the circle can be calculated by using the formula: Below is the Java Program to calculate the area of the circle:-, Time complexity: O(1) since performing constant operations, JAVA Programming Foundation- Self Paced Course, Data Structures & Algorithms- Self Paced Course, Program to calculate area of inner circle which passes through center of outer circle and touches its circumference, Find area of the larger circle when radius of the smaller circle and difference in the area is given, Java Program for Program to find area of a circle, Java Program to Find the Area of a Circle Given the Radius, Java Program to Find Area of circle Using Method Overloading, Program to calculate the Area and Perimeter of Incircle of an Equilateral Triangle, Equation of circle when three points on the circle are given, Check if a circle lies inside another circle or not, Program to calculate the area between two Concentric Circles, Area of a Circumscribed Circle of a Square. As usual , you always represent the values in binary numbers. Each of the inherited class from shape class should provide the implementation for the method printarea (). Java program to enter the radius of a circle and find its diameter, circumference, and area. (, How to print the Fibonacci series in Java using recursion? Algorithm: Start Declare three different classes for rectangle, square, and circle. All it understoodas , ( The main function, where the execution of, ( here above instruction is get input in the required format. area of circle is 'PI*R^2' ", "Area of Circle calculate by Java program is : ", cannot call a non-static method from a static context, best data structure and algorithms courses. December 11, 2022 Please mail your requirement at [emailprotected] Duration: 1 week to 2 week. Java Program to Calculate the Area of a Circle import java.util. In this program, we will learn to calculate and display the area of a circle. Then System.out.println(); will be used to display a message - " Enter radius of circle:". Please enter the radius : 5 Area of Circle = 78.5 Perimeter of Circle = 31.400002 Categories Java Practical Tags core java , java , java practical , sycs , sycs syit , syit Post navigation Java program to print reverse pyramid Access Modifiers in Java - Public, Private, Protec Top 50 Servlet and Filter Interview Questions Answ How to display date in multiple timezone in Java w JDBC - How to Convert java.sql.Date to java.util.D 5 Essential JDK 7 Features for Java Programmers. Enter the radius of the circle :: 55 Area of the circle is ::9503.317777109125 Java Program to Calculate and Display Area of a Circle. Now we can read the command line argument and calculate the area: double radius = Double.parseDouble (args [ 0 ]); calculateArea (radius); When we compile and run the program: java CircleArea.java javac CircleArea 7 we'll get the following output: The area of the circle [radius = 7.0]: 153.93804002589985 2.2. Java program to Calculate Area of a Circle Find Area of Circle in Java - This program will read radius from the user and calculate the Area4 of the circle. If you have any doubts related to this program , do comment here. MENU: 1.Area of circle 2.Area of triangle 3.Area of rectangle Please enter any of the above option: 2 Please enter base and height of triangle: 20 100 Area of triangle is: 1000.0 . To calculate the area of a circle the standard formula is: Area = Pi R Square. Difference between int and Integer Types in Java? It's an interesting theory for Maths lovers. I'm starting with my version of very basic program: calculating area of . Java Program to Calculate Area and Circumference of a Circle This article covers a program in Java that find and prints area and circumference of a circle. Thanks for reading this article so far. All Java program needs one main() function from where it starts executing program. which is given by user.when user give 10 as input actually in user perspective it is number but any number or stringwhich entered onconsole by default those are strings, 1o as string but we want 10 as number format for that we have method to convert string to number(Int, Double, Float, Long..) some of those method are: Step 7:System.out.println(Area of Circle is: + area); ( Once, you entered the radius , the value stored in a particular function ( nextDouble(); ) and read those values with the help of a scanner and display the output for a given value. 1. Another program to print AOC using inheritance with sample example output. Difference between == and === Equal Operator in J What is Thread and Runnable in Java? JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. area of circle create a functionin java area of a circlejava circumference of a circle in java claculating a circle area in java code segment in java calculate area of a circle using methods compute area of a circle in java area of circle in java program area of circle using staticfinal java area (int radius) java calculate area of circle java In geometry, the area enclosed by a circle of radius r is r 2. Then define a class name CircArea. Java Program to Calculate the Area of Circle. Java program to calculate the area of a cylinder; 8. So, first you have to import the util package of Java so that you can use the Scanner class in this program which will help programmers to fetch input from users. 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Java program to find the area of a circle Java Program to Find the Area of a Trapezium Java Program to Find the Area of a Parallelogram Find the Area of a Circle in Java Program Java program to find the square root of a given number Program for Area Of Square in C++ Program to calculate the area of an Circle inscribed in a Square area of circle in java java by Bad Buffalo on Sep 02 2020 Comment 1 xxxxxxxxxx 1 import java.util.Scanner; 2 public class AreaOfCircle { 3 public static void main(String args[]) { 4 int radius; 5 double area; 6 Scanner sc = new Scanner(System.in); 7 System.out.println("Enter the radius of the circle ::"); 8 radius = sc.nextInt(); 9 This program is used to calculate the area of a circle where the radius will be fetched from user. Feel free to comment, ask questions if you have any doubt. Here is the simple formula for calculating the area of the circle -. 1.Area of circle 2.Area of triangle 3.Area of rectangle Please enter any of the above option: 1 Please enter radius of circle: 5 Area of circle is: 78.57142857142857. java program to find the area of a circle. So, first you have to import the util package of Java so that you can use the Scanner class in this program which will help programmers to fetch input from users. Given a radius of the circle, write a java program to calculate and display the area of the circle. The area of a circle is the number of square units within the circle. ( 1. Provide three classes named rectangle, triangle and circle such that each one of the classes extends the class Shape. 5 ways to redirect a web page using JavaScript and 7 Reasons of NOT using SELECT * in a SQL Query? Area = pi * r2. (Take =3.142). This Java program is used to calculate the area of a circle. so to get access on a console we want to create an object Syntax:new Scanner(); after creating an object that reference will store in variable s ), ( above code is giving instructionsfor the user to give the input for radius), ( here above instruction is get input in the required format. When you purchase, we may earn a commission. Area of circle = (A = r) Logic. To calculate the area of the circle we have to use a formula that is: (22*r*r)/7. 13 Jul 2018. *; public class Main{ 2) Declare a variable for taking input:- radius. Disclosure: This article may contain affiliate links. Difference between static and non static nested cl Eclipse and NetBeans Keyboard Shortcuts for Java P How to get First and Last Character of String in J 2 Ways to Add Binary Numbers in Java - Coding Example. The three scenarios are: if the radius is known, if the diameter is known, if the circumference is known. In geometry, the area enclosed by a circle of radius r is r2. 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Inside the class define the main() function. Area of Circle Formulas When the radius is known: When the diameter is known: When the circumference is known: Where, A: is an area of a circle : is a constant, whose value is 3.1415 or 22/7. If you set the area to a given value, it should also set the radius. here we using a package called until it consists of many classes and we using one of the class Scanner to get command over console which is the interface between user and program. This input is stored in double data type variable 'radius'. Example Tutorial. This example allows entering the circle radius and finding the diameter, area, and circumference using a math formula. Copyright 2011-2021 www.javatpoint.com. Then using area of circle formula area is calculated. Then the statement rad = s.nextInt(); will be used to fetch the value from keyboard, and parse it to integer from string and store to variable rad. View . The user provides an option and the switch statement executes the corresponding case. //program that calculates the area and circumference of a circle import java.util.Scanner; //program uses class scanner . STEP 1: Declare the class Area with a public modifier. STEP 2: Open the main () to start the program, Java program execution starts with the main () STEP 3: Declare the variables a,r as double and set pi=3.14. Difference between Daemon Thread vs User Thread in How to Fix java.lang.ClassNotFoundException: com.m How to recursive copy directory in Java with sub-d How to join two threads in Java? java.net.SecureCacheResponse Class in Java, Files createTempDirectory() Method in Java with Examples. Example Tutorial, 15 People Java Developers Should Follow on Twitter, How to append text to file in Java? The formula that we have used in the program is: In the following program, we have calculated the area and circumference of the circle in a single program. If you have any questions or feedback about this Java Programming exercise then please ask. Area of a circle is the product of the square of its radius, and the value of PI, Therefore, to calculate the area of a rectangle Get the radius of the circle. Java Program to find Diameter, Circumference, and Area of a Circle Write a Java Program to find the Diameter, Circumference, and Area of a circle with an example. For example here: String str1 = "C"; String str2 = "c"; boolean help = str1.equalsIgnoreCase (str2); The value of help will be true. (, Program to check if a number is an Armstrong number or not? By using that value, this Java program will find the Area and Circumference of the Circle. Difference between Primary key vs Candidate Key in 3 ways to convert String to byte array in Java - E How to work with Files and Directories in Java? However, Reference Links Are Allowed To Our Original Articles - JT. Area of a Circle in Java The formula for calculating area of a circle is, Area = PI * r * r, where PI is a constant and r is the radius of the circle. Procedure: Create an abstract class named shape that contains two integers and an empty method named printarea (). There are you will learn how to find the diameter, circumference, and area of a circle in the Java language. where r is radius of circle and it maybe in float because value of pie is 3.14. JavaTpoint offers too many high quality services. Procedure To Develop A Java Program To Calculate Area Of The Circle, 1) Define a class and main method. Write a Java program to print the area and perimeter of a circle. Exa How to Fix with java.net.SocketException: Connecti How to Solve String Anagram Coding Problem Solutio Top 5 Java EE Mistakes Java Web Developers should How to get current Day, Month, Year from Date in J How to use ConcurrentHashSet from ConcurrentHashMa How to Convert a LinkedList to an Array in Java? Algorithm to Calculate the area of the circle. Even though my code compiles and runs without any errors, the program doesn't calculate the circumference. The second method for the above program #sample method 2,with online compile using command line arguments method: The purpose of using the Double is , whenever you enter the radius of a particularnumber like 7 , the answer is 153.86 , numbers after decimal points will also be displayed on the screen. Area of Circle using Java Program If we know the radius of the circle, then we can directly calculate the area by using a standard formula, A = * (radius * radius) Working:- Calculate the area by using the standard formula: A = * (radius * radius) or A = * (diameter * diameter)/4 Print the result. (, Java Program to calculate Simple Interest? Java program to calculate the area of Triangle The systemcant able to understandwhether the given number is a number, or given letter is a letter. Here we have taken radius as input from the user, and to calculate the area of the circle we have to multiply the value of pi with the square of the radius. Difference between wait and sleep in Java Thread? Copyrighted Protected. Then define a class name CircArea. But, if you were written like that, then the system wont understand, until and unless you assign the value of PIE is 22/7. 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First, you can use the String.equalsIgnoreCase (String s) method to compare two strings regardless of the case. By using our site, you Area of circle = r2 Circumference of circle = 2r Here value is 22/7 or 3.14 (rounding of the output of 22/7 upto 2 decimal places). The area of a circle is the number of square units inside the circle. (, Write a Java Program to check if a number is a palindrome or not? Given the radius of a circle, find the area of that circle. STEP 2: Open the main () to start the program, Java program execution starts with the main () STEP 3: Read the side of the square from the user into the variable s. STEP 4: Calculate the area of the square as a=s*s. There you go another program using the interface with sample outputs. But, for better coding experience purposes, we'll just create a method to calculate the area of a circle. Otherwise, you'll have a circle wich has a radius of 1 and an area of 10000, and your circle won't be a circle anymore. Duplication or Copying Our Site Content Is Strictly Prohibited. In the following Java program, we have used a Java switch case because we have used three scenarios to find the area of the circle. How to use Stream and Lambda Expressions for Clean How to Convert a List of String to Comma Separated Can you join two unrelated tables in SQL? 4) Read input from end-user and store them in the declared variable. This program is used to calculate the area of a circle where the radius will be fetched from user. ), ( The main function, where the execution of program startfrom here onwards ). Here goes the complete step by step explanation of the above code and how it works. r: is the radius of a circle acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Fundamentals of Java Collection Framework, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Split() String method in Java with examples, Object Oriented Programming (OOPs) Concept in Java. You can calculate the area of a circlein Java by just writing a class and a method. - JB Nizet Nov 3, 2013 at 18:47 Add a comment 6 Answers Sorted by: calculate area of circle", "Formula for calculating The formula to calculate the area of a circle is as follows, Area of a Circle, A = r, where, (pie) is equal to the fraction 22/7 and r stands for radius. Inside the class define the main () function. 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