Find out the area of circle take user input in java Programming .

Find out  the area of circle take  user input in java Programming .

Theory : First we have to take a variable r in data type int or float as your wish .Now you have to set a veriable in  data type float (pi=3.1416), and  you take  a float type  variable name area .

Now you have to take input from user by using

(Scanner input =new Scanner (System.in);

r=input.nextInt();)

After doing this things you hae to apply the theory of area of circle (area =pi*r*r). after that print the  area veriable.

Souce Code:

               

package basicjava;

import java.util.Scanner;

public class AreaOCircle {

    public static void main(String[] args) {

      int r;

      float area,pi=(float) 3.1416;

     

      Scanner input =new Scanner (System.in);

        System.out.println("Enter the value of r:");

       

        r=input.nextInt();

       

        area=pi*r*r;

        System.out.println("Area of cicle is = "+area);

    }

   

}

Output :

Enter the value of r:5

Area of cicle is = 78.53999