Java program to calculate area of a circle - Studyfied Program

Java program to calculate area of a circle

March 25, 2019 Karan Mandal

Basic programs
All Java basic programs - Home Print hello world Print to console Input output integer Input output string Addition of numbers Swap two numbers - using temp Swap two numbers - without temp Calculate area of circle Calculate simple interest Calculate compound interest Find ASCII value of a character Calculate year week and days from given total days Print size of different datatypes
If else programs
Check if character is alphabet or not Check whether a character is alphabet, digit or special character Find largest number using if statement Find largest number using if else statement Find largest number using nested if else statement Check whether a year is leap year or not Check whether number is even or odd Check whether a number is negative, positive or zero Check whether a character is upper or lowercase alphabet Check whether a character is vowel or consonant Print day name of week from number
Loop programs
Print all odd numbers from 1 to N Calculate sum of first N odd numbers Print all even numbers from 1 to N Calculate sum of first N even numbers Print first N natural numbers using for loop Print first N natural numbers using while loop Calculate sum of first N natural numbers Print all prime numbers between 1 to N Print sum of prime numbers between 1 to N Find all factors of a number Print alphabets from a to z Check whether a given number is perfect number or not Check whether a given number is Armstrong number or not Check whether a number is palindrome or not Check whether a number is prime number or not Count number of digits in a given integer Find product of digits in a number Find sum of all digits in a number Calculate factorial of a number Find HCF of two user given numbers Find LCM of two user given numbers Calculate power of a number using for loop Find reverse of any number Print multiplication table of a any given number

Area of a circle

The area of a circle is the number of square units within the circle. To calculate the area of a circle the standard formula is: Area = Pi R Square

Area of circle = (A = πr²)

Logic

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.

Value of Pi = (3.14159)

Program

AreaOfCircle.java Copy

import java.util.Scanner;

public class AreaOfCircle {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter radius of the circle : ");
        float radius = scanner.nextFloat();

        // Calculate area of circle
        double area = 3.14 * (radius * radius);

        System.out.println("Area of circle : " + area);
    }
}

Output

Enter radius of the circle : 25.125 Area of circle : 1982.1740625

Know more about Pi? – What is Pi?

Program tags java programs program programming

Share

Leave a Reply Cancel reply

You must be logged in to post a comment.

Table of contents